There are N infants registered in AtCoder, numbered 1 to N, and 2\times 10^5 kindergartens, numbered 1 to 2\times 10^5.
Infant i has a rating of A_i and initially belongs to Kindergarten B_i.
From now on, Q transfers will happen.
After the j-th transfer, Infant C_j will belong to Kindergarten D_j.
Here, we define the evenness as follows. For each kindergarten with one or more infants registered in AtCoder, let us find the highest rating of an infant in the kindergarten. The evenness is then defined as the lowest among those ratings.
For each of the Q transfers, find the evenness just after the transfer.

-----Constraints-----
 - 1 \leq N,Q \leq 2 \times 10^5
 - 1 \leq A_i \leq 10^9
 - 1 \leq C_j \leq N
 - 1 \leq B_i,D_j \leq 2 \times 10^5
 - All values in input are integers.
 - In the j-th transfer, Infant C_j changes the kindergarten it belongs to.

-----Input-----
Input is given from Standard Input in the following format:
N Q
A_1 B_1
A_2 B_2
:
A_N B_N
C_1 D_1
C_2 D_2
:
C_Q D_Q

-----Output-----
Print Q lines.
The j-th line should contain the evenness just after the j-th transfer.

-----Sample Input-----
6 3
8 1
6 2
9 3
1 1
2 2
1 3
4 3
2 1
1 2

-----Sample Output-----
6
2
6

Initially, Infant 1, 4 belongs to Kindergarten 1, Infant 2, 5 belongs to Kindergarten 2, and Infant 3, 6 belongs to Kindergarten 3.
After the 1-st transfer that makes Infant 4 belong to Kindergarten 3, Infant 1 belongs to Kindergarten 1, Infant 2, 5 belong to Kindergarten 2, and Infant 3, 4, 6 belong to Kindergarten 3. The highest ratings of an infant in Kindergarten 1, 2, 3 are 8, 6, 9, respectively. The lowest among them is 6, so the 1-st line in the output should contain 6.
After the 2-nd transfer that makes Infant 2 belong to Kindergarten 1, Infant 1, 2 belong to Kindergarten 1, Infant 5 belongs to Kindergarten 2, and Infant 3, 4, 6 belong to Kindergarten 3. The highest ratings of an infant in Kindergarten 1, 2, 3 are 8, 2, 9, respectively. The lowest among them is 2, so the 2-nd line in the output should contain 2.
After the 3-rd transfer that makes Infant 1 belong to Kindergarten 2, Infant 2 belongs to Kindergarten 1, Infant 1, 5 belong to Kindergarten 2, and Infant 3, 4, 6 belong to Kindergarten 3. The highest ratings of an infant in Kindergarten 1, 2, 3 are 6, 8, 9, respectively. The lowest among them is 6, so the 3-rd line in the output should contain 6.

Source: atcoder | Difficulty: MEDIUM_HARD


Solutions:
from heapq import heappop, heappush
(n, q) = map(int, input().split())
enzi = [[0, 0] for i in range(n)]
youti = [[] for i in range(2 * 10 ** 5)]
saikyo = [0 for i in range(2 * 10 ** 5)]
ans = []
for i in range(n):
	(a, b) = map(int, input().split())
	enzi[i] = [a, b - 1]
	heappush(youti[b - 1], (-a, i))
for i in range(2 * 10 ** 5):
	if youti[i]:
		now = heappop(youti[i])
		saikyo[i] = -now[0]
		heappush(ans, (-now[0], i))
		heappush(youti[i], now)
for _ in range(q):
	(c, d) = map(lambda x: int(x) - 1, input().split())
	heappush(youti[d], (-enzi[c][0], c))
	moto = enzi[c][1]
	enzi[c][1] = d
	while True:
		if youti[moto]:
			now = heappop(youti[moto])
			if enzi[now[1]][1] == moto:
				if saikyo[moto] != -now[0]:
					saikyo[moto] = -now[0]
					heappush(ans, (-now[0], moto))
				heappush(youti[moto], now)
				break
		else:
			saikyo[moto] = 0
			break
	while True:
		now = heappop(youti[d])
		if enzi[now[1]][1] == d:
			if saikyo[d] != -now[0]:
				saikyo[d] = -now[0]
				heappush(ans, (-now[0], d))
			heappush(youti[d], now)
			break
	while True:
		now = heappop(ans)
		if saikyo[now[1]] == now[0]:
			print(now[0])
			heappush(ans, now)
			break


from heapq import *
(f, g) = (heappush, heappop)
((n, q), *z) = [[*map(int, t.split())] for t in open(0)]
(*x, (l, r)) = eval('[[],[]],' * 8 ** 6)
for (a, b) in z[:n]:
	f(x[b][0], -a)
for (t, _) in x:
	t and f(l, -t[0])
for (c, d) in z[n:]:
	(a, b) = z[c - 1]
	z[c - 1] = (a, d)
	(v, w) = x[b]
	(y, _) = x[d]
	t = y and y[0] or 0
	(f(y, -a), f(w, -a))
	if -v[0] == a:
		while w and w[0] == v[0]:
			(g(w), g(v))
		f(r, a)
		v and f(l, -v[0])
	if y[0] < t:
		f(l, a)
		t and f(r, -t)
	while r and l[0] == r[0]:
		(g(l), g(r))
	print(l[0])


import math, string, itertools, fractions, heapq, collections, re, array, bisect, sys, copy, functools
import time, random, resource
sys.setrecursionlimit(10 ** 7)
inf = 10 ** 20
eps = 1.0 / 10 ** 10
mod = 10 ** 9 + 7
dd = [(-1, 0), (0, 1), (1, 0), (0, -1)]
ddn = [(-1, 0), (-1, 1), (0, 1), (1, 1), (1, 0), (1, -1), (0, -1), (-1, -1)]

def LI():
	return list(map(int, sys.stdin.readline().split()))

def LLI():
	return [list(map(int, l.split())) for l in sys.stdin.readlines()]

def LI_():
	return [int(x) - 1 for x in sys.stdin.readline().split()]

def LF():
	return [float(x) for x in sys.stdin.readline().split()]

def LS():
	return sys.stdin.readline().split()

def I():
	return int(sys.stdin.readline())

def F():
	return float(sys.stdin.readline())

def S():
	return input()

def pf(s):
	return print(s, flush=True)

def pe(s):
	return print(str(s), file=sys.stderr)

def JA(a, sep):
	return sep.join(map(str, a))

def JAA(a, s, t):
	return s.join((t.join(map(str, b)) for b in a))

class DQ:

	def __init__(self):
		self.q = []
		self.d = []

	def add(self, x):
		heapq.heappush(self.q, x)

	def rem(self, x):
		heapq.heappush(self.d, x)

	def top(self):
		while self.d and self.q[0] == self.d[0]:
			heapq.heappop(self.q)
			heapq.heappop(self.d)
		if self.q:
			return self.q[0]
		return None

def main():
	(n, q) = LI()
	ab = [LI() for _ in range(n)]
	cd = [LI() for _ in range(q)]
	m = 2 * 10 ** 5 + 1
	r = DQ()
	t = [DQ() for _ in range(m)]
	ca = [-1] * (n + 1)
	e = [-1] * (n + 1)
	for c in range(1, n + 1):
		(a, b) = ab[c - 1]
		ca[c] = a
		e[c] = b
		tp = t[b].top()
		if tp:
			s = -tp
			if s < a:
				r.rem(s)
				r.add(a)
			t[b].add(-a)
		else:
			r.add(a)
			t[b].add(-a)
	rr = []
	for (c, d) in cd:
		a = ca[c]
		b = e[c]
		e[c] = d
		s = -t[b].top()
		t[b].rem(-a)
		if s == a:
			r.rem(a)
			u = t[b].top()
			if not u is None:
				r.add(-u)
		tp = t[d].top()
		if tp:
			s = -tp
			if s < a:
				r.rem(s)
				r.add(a)
			t[d].add(-a)
		else:
			r.add(a)
			t[d].add(-a)
		rr.append(r.top())
	return JA(rr, '\n')
print(main())


import sys
readline = sys.stdin.readline
import heapq as hq
(N, Q) = list(map(int, readline().split()))
NN = 2 * 10 ** 5
infants = [None] * (N + 1)
kinda = [[] for i in range(NN + 1)]
for i in range(N):
	(a, b) = list(map(int, readline().split()))
	infants[i + 1] = [a, b]
	hq.heappush(kinda[b], (-a, i + 1))
all_kinda = []
for i in range(len(kinda)):
	if kinda[i]:
		hq.heappush(all_kinda, (-kinda[i][0][0], i))

def get_max_rate(x):
	q = kinda[x]
	while q:
		(rate, ind) = hq.heappop(q)
		if infants[ind][1] != x:
			continue
		hq.heappush(q, (rate, ind))
		return -rate
	return -1
for i in range(Q):
	(ind, next_kinda_id) = list(map(int, readline().split()))
	(rate, old_kinda_id) = infants[ind]
	infants[ind][1] = next_kinda_id
	hq.heappush(kinda[next_kinda_id], (-rate, ind))
	old_kinda_max_rate = get_max_rate(old_kinda_id)
	if old_kinda_max_rate != -1:
		hq.heappush(all_kinda, (old_kinda_max_rate, old_kinda_id))
	next_kinda_max_rate = get_max_rate(next_kinda_id)
	if next_kinda_max_rate != -1:
		hq.heappush(all_kinda, (next_kinda_max_rate, next_kinda_id))
	while all_kinda:
		(rate, kinda_id) = hq.heappop(all_kinda)
		cur_max_rate = get_max_rate(kinda_id)
		if rate != cur_max_rate:
			continue
		hq.heappush(all_kinda, (rate, kinda_id))
		print(rate)
		break


import sys
import heapq
from collections import defaultdict
sys.setrecursionlimit(10 ** 6)
INF = float('inf')
MOD = 10 ** 9 + 7

def input():
	return sys.stdin.readline().strip()

def main():
	MAX = 10 ** 5 * 2
	(N, Q) = list(map(int, input().split()))
	heap = [[] for _ in range(MAX)]
	for i in range(MAX):
		heapq.heapify(heap[i])
	rates = [0] * N
	places = [0] * N
	for i in range(N):
		(a, b) = list(map(int, input().split()))
		places[i] = b - 1
		rates[i] = a
		heapq.heappush(heap[b - 1], (-a, i))
	heap_all = []
	heapq.heapify(heap_all)
	m = INF
	p = None
	for i in range(MAX):
		if not heap[i]:
			continue
		m = -heap[i][0][0]
		p = i
		child = heap[i][0][1]
		heapq.heappush(heap_all, (m, p, child))
	ans = []
	for _ in range(Q):
		(c, d) = list(map(int, input().split()))
		child = c - 1
		cur = d - 1
		prev = places[child]
		rate = rates[child]
		heapq.heappush(heap[cur], (-rate, child))
		places[child] = cur
		while heap[prev]:
			(v, i) = heap[prev][0]
			if places[i] == prev:
				heapq.heappush(heap_all, (-v, prev, i))
				break
			else:
				heapq.heappop(heap[prev])
		while heap[cur]:
			(v, i) = heap[cur][0]
			if places[i] == cur:
				heapq.heappush(heap_all, (-v, cur, i))
				break
			else:
				heapq.heappop(heap[cur])
		while True:
			(r, p, i) = heap_all[0]
			if p == places[i] and heap[p][0][0] == -r:
				ans.append(r)
				break
			else:
				heapq.heappop(heap_all)
	for a in ans:
		print(a)

def __starting_point():
	main()
__starting_point()


(N, Q) = map(int, input().split())
where = []
rating = []
from heapq import heapify, heappop, heappush
garten = [[] for _ in range(2 * 10 ** 5)]
saikyo = []
for i in range(N):
	(A, B) = map(int, input().split())
	where.append(B - 1)
	rating.append(A)
	heappush(garten[B - 1], (-A, i))
for i in range(2 * 10 ** 5):
	if not garten[i]:
		continue
	(rate, num) = garten[i][0]
	heappush(saikyo, (-rate, i))
for _ in range(Q):
	(C, D) = map(int, input().split())
	(C, D) = (C - 1, D - 1)
	moto = where[C]
	where[C] = D
	heappush(garten[D], (-rating[C], C))
	if garten[D][0][1] == C:
		heappush(saikyo, (rating[C], D))
	while garten[moto]:
		(a, b) = garten[moto][0]
		if where[b] == moto:
			break
		heappop(garten[moto])
	heappush(saikyo, (-a, moto))
	while True:
		(a, b) = saikyo[0]
		if not garten[b]:
			heappop(saikyo)
			continue
		if garten[b][0][0] == -a:
			break
		heappop(saikyo)
	print(a)


import sys
import heapq as hq
readline = sys.stdin.readline
ns = lambda : readline().rstrip()
ni = lambda : int(readline().rstrip())
nm = lambda : list(map(int, readline().split()))
nl = lambda : list(map(int, readline().split()))
(n, q) = nm()
m = 2 * 10 ** 5 + 5
cur = [-1] * n
rate = [0] * n
sec = [list() for _ in range(m)]
for i in range(n):
	(a, b) = nm()
	rate[i] = a
	cur[i] = b
	hq.heappush(sec[b], (-a, i))
top = list()
for i in range(m):
	if sec[i]:
		hq.heappush(top, (-sec[i][0][0], sec[i][0][1], i))
for _ in range(q):
	(c, d) = nm()
	c -= 1
	bef = cur[c]
	cur[c] = d
	hq.heappush(sec[d], (-rate[c], c))
	if sec[d][0][1] == c:
		hq.heappush(top, (rate[c], c, d))
	fl = 0
	while sec[bef] and cur[sec[bef][0][1]] != bef:
		hq.heappop(sec[bef])
		fl = 1
	if fl and sec[bef]:
		hq.heappush(top, (-sec[bef][0][0], sec[bef][0][1], bef))
	while not sec[top[0][2]] or sec[top[0][2]][0][1] != top[0][1]:
		hq.heappop(top)
	print(top[0][0])


from heapq import heapify, heappush, heappop
import sys
input = sys.stdin.readline
(N, Q) = list(map(int, input().split()))
S = []
PQs = [[] for _ in range(200000)]
T = [0] * 200000
M = []
for n in range(N):
	(a, b) = list(map(int, input().split()))
	S.append([a, b - 1])
	PQs[b - 1] += [(-a, n)]
for b in range(200000):
	if len(PQs[b]) > 0:
		heapify(PQs[b])
		M.append((-PQs[b][0][0], b, 0))
heapify(M)
ans = []
for q in range(1, Q + 1):
	(c, d) = list(map(int, input().split()))
	d = d - 1
	d_prv = S[c - 1][1]
	S[c - 1][1] = d
	heappush(PQs[d], (-S[c - 1][0], c - 1))
	while d != S[PQs[d][0][1]][1]:
		heappop(PQs[d])
	if -PQs[d][0][0] == S[c - 1][0]:
		heappush(M, (-PQs[d][0][0], d, q))
		T[d] = q
	if len(PQs[d_prv]) > 0:
		while d_prv != S[PQs[d_prv][0][1]][1]:
			heappop(PQs[d_prv])
			if len(PQs[d_prv]) == 0:
				break
		if len(PQs[d_prv]) > 0 and -PQs[d_prv][0][0] < S[c - 1][0]:
			heappush(M, (-PQs[d_prv][0][0], d_prv, q))
		if len(PQs[d_prv]) == 0 or -PQs[d_prv][0][0] < S[c - 1][0]:
			T[d_prv] = q
	while M[0][2] != T[M[0][1]]:
		heappop(M)
	ans.append(M[0][0])
print('\n'.join(map(str, ans)))


import heapq
MAXEN = 2 * 10 ** 5 + 5
(N, Q) = list(map(int, input().split()))
kid = [0]
en = [0]
entop = [[] for _ in range(MAXEN)]
alltop = []
addAllList = []
rmvAllList = []
for i in range(N):
	(a, b) = list(map(int, input().split()))
	kid.append(a)
	en.append(b)
	heapq.heappush(entop[b], -a)
for e in range(MAXEN):
	if entop[e]:
		vv = entop[e][0]
		heapq.heappush(alltop, -vv)
addlist = [[] for _ in range(MAXEN)]
rmvlist = [[] for _ in range(MAXEN)]

def updateEn(enID):
	while len(addlist[enID]) > 0:
		add_top = addlist[enID][0]
		needAddNow = True
		if len(rmvlist[enID]) > 0:
			needAddNow = True
		elif entop[enID]:
			entop_old = entop[enID][0]
			needAddNow = add_top < entop_old
		if needAddNow:
			heapq.heappush(entop[enID], add_top)
			heapq.heappop(addlist[enID])
		else:
			break
	while len(entop[enID]) > 0 and len(rmvlist[enID]) > 0:
		rmv_top = rmvlist[enID][0]
		entop_old = entop[enID][0]
		if rmv_top == entop_old:
			heapq.heappop(entop[enID])
			heapq.heappop(rmvlist[enID])
		else:
			break
for q in range(Q):
	(c, d) = list(map(int, input().split()))
	old_en = en[c]
	new_en = d
	en[c] = new_en
	heapq.heappush(rmvlist[old_en], -kid[c])
	heapq.heappush(addlist[new_en], -kid[c])
	if len(entop[old_en]) > 0:
		entop_old0 = entop[old_en][0]
	else:
		entop_old0 = 0
	if len(entop[new_en]) > 0:
		entop_new0 = entop[new_en][0]
	else:
		entop_new0 = 0
	updateEn(new_en)
	updateEn(old_en)
	if len(entop[old_en]) > 0:
		entop_old1 = entop[old_en][0]
	else:
		entop_old1 = 0
	if entop_old0 != entop_old1:
		if entop_old0 != 0:
			heapq.heappush(rmvAllList, -entop_old0)
		if entop_old1 != 0:
			heapq.heappush(addAllList, -entop_old1)
	if len(entop[new_en]) > 0:
		entop_new1 = entop[new_en][0]
	else:
		entop_new1 = 0
	if entop_new0 != entop_new1:
		if entop_new0 != 0:
			heapq.heappush(rmvAllList, -entop_new0)
		if entop_new1 != 0:
			heapq.heappush(addAllList, -entop_new1)
	while len(addAllList) > 0:
		add_top = addAllList[0]
		if len(alltop) == 0 or add_top < alltop[0] or len(rmvAllList) > 0:
			heapq.heappush(alltop, add_top)
			heapq.heappop(addAllList)
		else:
			break
	while len(rmvAllList) > 0:
		rmvTopV = rmvAllList[0]
		if rmvTopV == alltop[0]:
			heapq.heappop(alltop)
			heapq.heappop(rmvAllList)
		else:
			break
	print(alltop[0])


import sys
import numpy as np
from heapq import heappush, heappop
from bisect import bisect_left as bi_l, bisect_right as bi_r
from collections import deque, Counter, defaultdict
from itertools import combinations, product
inf = float('inf')
MOD = 10 ** 9 + 7

class NumberTheory:

	def __init__(self, n=2 * 10 ** 6, numpy=True):
		self.n = n
		self.np_flg = numpy
		(self.is_prime_number, self.prime_numbers) = self.sieve_of_eratosthenes(n)

	def sieve_of_eratosthenes(self, n):
		if self.np_flg:
			sieve = np.ones(n + 1, dtype=np.int64)
			sieve[:2] = 0
			for i in range(2, int(n ** 0.5) + 1):
				if sieve[i]:
					sieve[i * 2::i] = 0
			prime_numbers = np.flatnonzero(sieve)
		else:
			sieve = [1] * (n + 1)
			sieve[0] = sieve[1] = 0
			for i in range(2, int(n ** 0.5) + 1):
				if not sieve[i]:
					continue
				for j in range(i * 2, n + 1, i):
					sieve[j] = 0
			prime_numbers = [i for i in range(2, n + 1) if sieve[i]]
		return (sieve, prime_numbers)

	def prime_factorize(self, n):
		res = dict()
		if n < 2:
			return res
		border = int(n ** 0.5)
		for p in self.prime_numbers:
			if p > border:
				break
			while n % p == 0:
				res[p] = res.get(p, 0) + 1
				n //= p
			if n == 1:
				return res
		res[n] = 1
		return res

	def prime_factorize_factorial(self, n):
		res = dict()
		for i in range(2, n + 1):
			for (p, c) in self.prime_factorize(i).items():
				res[p] = res.get(p, 0) + c
		return res

	@staticmethod
	def gcd(a, b):
		return gcd(b, a % b) if b else abs(a)

	@staticmethod
	def lcm(a, b):
		return abs(a // gcd(a, b) * b)

	@staticmethod
	def find_divisors(n):
		divisors = []
		for i in range(1, int(n ** 0.5) + 1):
			if n % i:
				continue
			divisors.append(i)
			j = n // i
			if j != i:
				divisors.append(j)
		return divisors

	@staticmethod
	def base_convert(n, b):
		if not n:
			return '0'
		res = ''
		while n:
			(n, r) = divmod(n, b)
			if r < 0:
				n += 1
				r -= b
			res += str(r)
		return res[::-1]

class UnionFind:

	def __init__(self, n=10 ** 6):
		self.root = list(range(n))
		self.height = [0] * n
		self.size = [1] * n

	def find_root(self, u):
		if self.root[u] == u:
			return u
		self.root[u] = self.find_root(self.root[u])
		return self.root[u]

	def unite(self, u, v):
		ru = self.find_root(u)
		rv = self.find_root(v)
		if ru == rv:
			return
		hu = self.height[ru]
		hv = self.height[rv]
		if hu >= hv:
			self.root[rv] = ru
			self.size[ru] += self.size[rv]
			self.height[ru] = max(hu, hv + 1)
		else:
			self.root[ru] = rv
			self.size[rv] += self.size[ru]

class Combinatorics:

	def __init__(self, N=10 ** 9, n=10 ** 6, mod=10 ** 9 + 7, numpy=True):
		self.mod = mod
		self.nCr = dict()
		self.np_flg = numpy
		self.make_mod_tables(N, n)
	sys.setrecursionlimit(10 ** 6)

	def choose(self, n, r, mod=None):
		if r > n or r < 0:
			return 0
		if r == 0:
			return 1
		if (n, r) in self.nCr:
			return self.nCr[n, r]
		if not mod:
			self.nCr[n, r] = self.choose(n - 1, r) + self.choose(n - 1, r - 1)
		else:
			self.nCr[n, r] = (self.choose(n - 1, r, mod) + self.choose(n - 1, r - 1, mod)) % mod
		return self.nCr[n, r]

	def cumprod(self, a):
		p = self.mod
		l = len(a)
		sql = int(np.sqrt(l) + 1)
		a = np.resize(a, sql ** 2).reshape(sql, sql)
		for i in range(sql - 1):
			a[:, i + 1] *= a[:, i]
			a[:, i + 1] %= p
		for i in range(sql - 1):
			a[i + 1] *= a[i, -1]
			a[i + 1] %= p
		return np.ravel(a)[:l]

	def make_mod_tables(self, N, n):
		p = self.mod
		if self.np_flg:
			fac = np.arange(n + 1)
			fac[0] = 1
			fac = self.cumprod(fac)
			ifac = np.arange(n + 1, 0, -1)
			ifac[0] = pow(int(fac[-1]), p - 2, p)
			ifac = self.cumprod(ifac)[n::-1]
			n_choose = np.arange(N + 1, N - n, -1)
			n_choose[0] = 1
			n_choose[1:] = self.cumprod(n_choose[1:]) * ifac[1:n + 1] % p
		else:
			fac = [None] * (n + 1)
			fac[0] = 1
			for i in range(n):
				fac[i + 1] = fac[i] * (i + 1) % p
			ifac = [None] * (n + 1)
			ifac[n] = pow(fac[n], p - 2, p)
			for i in range(n, 0, -1):
				ifac[i - 1] = ifac[i] * i % p
			n_choose = [None] * (n + 1)
			n_choose[0] = 1
			for i in range(n):
				n_choose[i + 1] = n_choose[i] * (N - i) % p
			for i in range(n + 1):
				n_choose[i] = n_choose[i] * ifac[i] % p
		(self.fac, self.ifac, self.mod_n_choose) = (fac, ifac, n_choose)

def z_algorithm(s):
	n = len(s)
	a = [0] * n
	a[0] = n
	l = r = -1
	for i in range(1, n):
		if r >= i:
			a[i] = min(a[i - l], r - i)
		while i + a[i] < n and s[i + a[i]] == s[a[i]]:
			a[i] += 1
		if i + a[i] >= r:
			(l, r) = (i, i + a[i])
	return a

class ABC001:

	def A():
		(h1, h2) = map(int, sys.stdin.read().split())
		print(h1 - h2)

	def B():
		pass

	def C():
		pass

	def D():
		pass

class ABC002:

	def A():
		(x, y) = map(int, sys.stdin.readline().split())
		print(max(x, y))

	def B():
		vowels = set('aeiou')
		s = sys.stdin.readline().rstrip()
		t = ''
		for c in s:
			if c in vowels:
				continue
			t += c
		print(t)

	def C():
		(*coords,) = map(int, sys.stdin.readline().split())

		def triangle_area(x0, y0, x1, y1, x2, y2):
			x1 -= x0
			x2 -= x0
			y1 -= y0
			y2 -= y0
			return abs(x1 * y2 - x2 * y1) / 2
		print(triangle_area(*coords))

	def D():
		(n, m) = map(int, sys.stdin.readline().split())
		edges = set()
		for _ in range(m):
			(x, y) = map(int, sys.stdin.readline().split())
			x -= 1
			y -= 1
			edges.add((x, y))
		cand = []
		for i in range(1, 1 << n):
			s = [j for j in range(n) if i >> j & 1]
			for (x, y) in combinations(s, 2):
				if (x, y) not in edges:
					break
			else:
				cand.append(len(s))
		print(max(cand))

class ABC003:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print((n + 1) * 5000)

	def B():
		atcoder = set('atcoder')
		(s, t) = sys.stdin.read().split()
		for i in range(len(s)):
			if s[i] == t[i]:
				continue
			if s[i] == '@' and t[i] in atcoder:
				continue
			if t[i] == '@' and s[i] in atcoder:
				continue
			print('You will lose')
			return
		print('You can win')

	def C():
		(n, k, *r) = map(int, sys.stdin.read().split())
		res = 0
		for x in sorted(r)[-k:]:
			res = (res + x) / 2
		print(res)

	def D():
		pass

class ABC004:

	def A():
		print(int(sys.stdin.readline().rstrip()) * 2)

	def B():
		c = [sys.stdin.readline().rstrip() for _ in range(4)]
		for l in c[::-1]:
			print(l[::-1])

	def C():
		n = int(sys.stdin.readline().rstrip())
		n %= 30
		res = list(range(1, 7))
		for i in range(n):
			i %= 5
			(res[i], res[i + 1]) = (res[i + 1], res[i])
		print(''.join(map(str, res)))

	def D():
		pass

class ABC005:

	def A():
		(x, y) = map(int, sys.stdin.readline().split())
		print(y // x)

	def B():
		(n, *t) = map(int, sys.stdin.read().split())
		print(min(t))

	def C():
		t = int(sys.stdin.readline().rstrip())
		n = int(sys.stdin.readline().rstrip())
		a = [int(x) for x in sys.stdin.readline().split()]
		m = int(sys.stdin.readline().rstrip())
		b = [int(x) for x in sys.stdin.readline().split()]
		i = 0
		for p in b:
			if i == n:
				print('no')
				return
			while p - a[i] > t:
				i += 1
				if i == n:
					print('no')
					return
			if a[i] > p:
				print('no')
				return
			i += 1
		print('yes')

	def D():
		n = int(sys.stdin.readline().rstrip())
		d = np.array([sys.stdin.readline().split() for _ in range(n)], np.int64)
		s = d.cumsum(axis=0).cumsum(axis=1)
		s = np.pad(s, 1)
		max_del = np.zeros((n + 1, n + 1), dtype=np.int64)
		for y in range(1, n + 1):
			for x in range(1, n + 1):
				max_del[y, x] = np.amax(s[y:n + 1, x:n + 1] - s[0:n - y + 1, x:n + 1] - s[y:n + 1, 0:n - x + 1] + s[0:n - y + 1, 0:n - x + 1])
		res = np.arange(n ** 2 + 1)[:, None]
		i = np.arange(1, n + 1)
		res = max_del[i, np.minimum(res // i, n)].max(axis=1)
		q = int(sys.stdin.readline().rstrip())
		p = np.array(sys.stdin.read().split(), dtype=np.int64)
		print(*res[p], sep='\n')

class ABC006:

	def A():
		n = sys.stdin.readline().rstrip()
		if '3' in n:
			print('YES')
		elif int(n) % 3 == 0:
			print('YES')
		else:
			print('NO')

	def B():
		mod = 10007
		t = [0, 0, 1]
		for _ in range(1001001):
			t.append(t[-1] + t[-2] + t[-3])
			t[-1] %= mod
		n = int(sys.stdin.readline().rstrip())
		print(t[n - 1])

	def C():
		(n, m) = map(int, sys.stdin.readline().split())
		cnt = [0, 0, 0]
		if m == 1:
			cnt = [-1, -1, -1]
		else:
			if m & 1:
				m -= 3
				cnt[1] += 1
				n -= 1
			cnt[2] = m // 2 - n
			cnt[0] = n - cnt[2]
		if cnt[0] < 0 or cnt[1] < 0 or cnt[2] < 0:
			print(-1, -1, -1)
		else:
			print(*cnt, sep=' ')

	def D():
		(n, *c) = map(int, sys.stdin.read().split())
		inf = float('inf')
		lis = [inf] * n
		for x in c:
			lis[bi_l(lis, x)] = x
		print(n - bi_l(lis, inf))

class ABC007:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print(n - 1)

	def B():
		s = sys.stdin.readline().rstrip()
		if s == 'a':
			print(-1)
		else:
			print('a')

	def C():
		(r, c) = map(int, sys.stdin.readline().split())
		(sy, sx) = map(int, sys.stdin.readline().split())
		(gy, gx) = map(int, sys.stdin.readline().split())
		sy -= 1
		sx -= 1
		gy -= 1
		gx -= 1
		maze = [sys.stdin.readline().rstrip() for _ in range(r)]
		queue = deque([(sy, sx)])
		dist = np.full((r, c), np.inf)
		dist[sy, sx] = 0
		while queue:
			(y, x) = queue.popleft()
			for (i, j) in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
				i += y
				j += x
				if maze[i][j] == '#' or dist[i, j] != np.inf:
					continue
				dist[i, j] = dist[y, x] + 1
				queue.append((i, j))
		print(int(dist[gy, gx]))

	def D():
		pass

class ABC008:

	def A():
		(s, t) = map(int, sys.stdin.readline().split())
		print(t - s + 1)

	def B():
		(n, *s) = sys.stdin.read().split()
		res = defaultdict(int)
		for name in s:
			res[name] += 1
		print(sorted(res.items(), key=lambda x: x[1])[-1][0])

	def C():
		(n, *a) = map(int, sys.stdin.read().split())
		a = np.array(a)
		c = n - np.count_nonzero(a[:, None] % a, axis=1)
		print(np.sum((c + 1) // 2 / c))

	def D():
		pass

class ABC009:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print((n + 1) // 2)

	def B():
		(n, *a) = map(int, sys.stdin.read().split())
		print(sorted(set(a))[-2])

	def C():
		(n, k) = map(int, sys.stdin.readline().split())
		s = list(sys.stdin.readline().rstrip())
		cost = [1] * n
		r = k
		for i in range(n - 1):
			q = []
			for j in range(i + 1, n):
				if s[j] < s[i] and cost[i] + cost[j] <= r:
					heappush(q, (s[j], cost[i] + cost[j], -j))
			if not q:
				continue
			(_, c, j) = heappop(q)
			j = -j
			(s[i], s[j]) = (s[j], s[i])
			r -= c
			cost[i] = cost[j] = 0
		print(''.join(s))

	def D():
		pass

class ABC010:

	def A():
		print(sys.stdin.readline().rstrip() + 'pp')

	def B():
		(n, *a) = map(int, sys.stdin.read().split())
		tot = 0
		for x in a:
			c = 0
			while x % 2 == 0 or x % 3 == 2:
				x -= 1
				c += 1
			tot += c
		print(tot)

	def C():
		(sx, sy, gx, gy, t, v, n, *xy) = map(int, sys.stdin.read().split())
		(x, y) = np.array(xy).reshape(-1, 2).T

		def dist(x1, y1, x2, y2):
			return np.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
		ans = 'YES' if (dist(sx, sy, x, y) + dist(x, y, gx, gy) <= v * t).any() else 'NO'
		print(ans)

	def D():
		pass

class ABC011:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print(n % 12 + 1)

	def B():
		s = sys.stdin.readline().rstrip()
		print(s[0].upper() + s[1:].lower())

	def C():
		(n, *ng) = map(int, sys.stdin.read().split())
		ng = set(ng)
		if n in ng:
			print('NO')
		else:
			r = 100
			while n > 0:
				if r == 0:
					print('NO')
					return
				for i in range(3, 0, -1):
					if n - i in ng:
						continue
					n -= i
					r -= 1
					break
				else:
					print('NO')
					return
			print('YES')

	def D():
		pass

class ABC170:

	def A():
		x = [int(x) for x in sys.stdin.readline().split()]
		for i in range(5):
			if x[i] != i + 1:
				print(i + 1)
				break

	def B():
		(x, y) = map(int, sys.stdin.readline().split())
		print('Yes' if 2 * x <= y <= 4 * x and y % 2 == 0 else 'No')

	def C():
		(x, n, *p) = map(int, sys.stdin.read().split())
		a = list(set(range(102)) - set(p))
		a = [(abs(y - x), y) for y in a]
		print(sorted(a)[0][1])

	def D():
		(n, *a) = map(int, sys.stdin.read().split())
		cand = set(a)
		cnt = 0
		for (x, c) in sorted(Counter(a).items()):
			cnt += c == 1 and x in cand
			cand -= set(range(x * 2, 10 ** 6 + 1, x))
		print(cnt)

	def E():
		(n, q) = map(int, sys.stdin.readline().split())
		queue = []
		num_kindergarten = 2 * 10 ** 5
		queue_kindergarten = [[] for _ in range(num_kindergarten)]
		highest_kindergarten = [None] * num_kindergarten
		where = [None] * n
		rate = [None] * n

		def entry(i, k):
			where[i] = k
			while queue_kindergarten[k]:
				(r, j) = heappop(queue_kindergarten[k])
				if where[j] != k or j == i:
					continue
				if rate[i] >= -r:
					highest_kindergarten[k] = rate[i]
					heappush(queue, (rate[i], k, i))
				heappush(queue_kindergarten[k], (r, j))
				break
			else:
				highest_kindergarten[k] = rate[i]
				heappush(queue, (rate[i], k, i))
			heappush(queue_kindergarten[k], (-rate[i], i))

		def transfer(i, k):
			now = where[i]
			while queue_kindergarten[now]:
				(r, j) = heappop(queue_kindergarten[now])
				if where[j] != now or j == i:
					continue
				if highest_kindergarten[now] != -r:
					highest_kindergarten[now] = -r
					heappush(queue, (-r, now, j))
				heappush(queue_kindergarten[now], (r, j))
				break
			else:
				highest_kindergarten[now] = None
			entry(i, k)

		def inquire():
			while True:
				(r, k, i) = heappop(queue)
				if where[i] != k or r != highest_kindergarten[k]:
					continue
				heappush(queue, (r, k, i))
				return r
		for i in range(n):
			(a, b) = map(int, sys.stdin.readline().split())
			rate[i] = a
			entry(i, b - 1)
		for _ in range(q):
			(c, d) = map(int, sys.stdin.readline().split())
			transfer(c - 1, d - 1)
			print(inquire())

	def F():
		pass

def __starting_point():
	ABC170.E()
__starting_point()


def solve():
	from heapq import heappop, heappush
	from collections import defaultdict
	(n, q) = list(map(int, input().split()))
	rates = [0] * (n + 1)
	belong = [0] * (n + 1)
	en = [[] for _ in range(2 * 10 ** 5 + 1)]
	ob = [defaultdict(int) for _ in range(2 * 10 ** 5 + 1)]
	res = []
	res_gone = defaultdict(int)
	ans = []
	for i in range(1, n + 1):
		(a, b) = list(map(int, input().split()))
		rates[i] = a
		belong[i] = b
		heappush(en[b], -a)
	for e in en:
		if e:
			x = -heappop(e)
			heappush(res, x)
			heappush(e, -x)
	for i in range(q):
		(c, d) = list(map(int, input().split()))
		tmp = belong[c]
		obr = rates[c]
		ob[tmp][obr] += 1
		ox_s = -heappop(en[tmp])
		res_gone[ox_s] += 1
		heappush(en[tmp], -ox_s)
		if en[d]:
			ox_m = -heappop(en[d])
			res_gone[ox_m] += 1
			heappush(en[d], -ox_m)
		belong[c] = d
		heappush(en[d], -rates[c])
		nx_s = -heappop(en[tmp])
		while ob[tmp][nx_s] != 0:
			ob[tmp][nx_s] -= 1
			nx_s = -heappop(en[tmp]) if en[tmp] else 0
		if nx_s != 0:
			heappush(res, nx_s)
			heappush(en[tmp], -nx_s)
		nx_m = -heappop(en[d])
		heappush(res, nx_m)
		heappush(en[d], -nx_m)
		fair = heappop(res)
		while res_gone[fair] != 0:
			res_gone[fair] -= 1
			fair = heappop(res)
		ans.append(fair)
		heappush(res, fair)
	print('\n'.join(map(str, ans)))
solve()


import heapq

class HeapDict:

	def __init__(self):
		self.h = []
		self.d = dict()

	def insert(self, x):
		heapq.heappush(self.h, x)
		if x not in self.d:
			self.d[x] = 1
		else:
			self.d[x] += 1

	def erase(self, x):
		if x not in self.d or self.d[x] == 0:
			print((x, 'is not in HeapDict'))
			return
		else:
			self.d[x] -= 1
		while len(self.h) != 0:
			if self.d[self.h[0]] == 0:
				heapq.heappop(self.h)
			else:
				break

	def is_exist(self, x):
		if x in self.d and self.d[x] != 0:
			return True
		else:
			False

	def get_min(self):
		return self.h[0]

	def size(self):
		return len(self.h)

def main():
	(N, Q) = list(map(int, input().split()))
	A = []
	B = []
	con = 2 * 10 ** 5
	INF = 10 ** 18
	youchi = [HeapDict() for _ in range(con)]
	max_values = HeapDict()
	for i in range(N):
		(a, b) = list(map(int, input().split()))
		b -= 1
		A.append(a)
		B.append(b)
		youchi[b].insert(-a)
	for i in range(con):
		if youchi[i].size() != 0:
			max_values.insert(-youchi[i].get_min())
		else:
			max_values.insert(INF)
	for i in range(Q):
		(c, d) = list(map(int, input().split()))
		c -= 1
		d -= 1
		rate = A[c]
		youchi_now = B[c]
		youchi_next = d
		max_values.erase(-youchi[youchi_now].get_min())
		youchi[youchi_now].erase(-rate)
		if youchi[youchi_now].size() != 0:
			max_values.insert(-youchi[youchi_now].get_min())
		if youchi[youchi_next].size() != 0:
			max_values.erase(-youchi[youchi_next].get_min())
		youchi[youchi_next].insert(-rate)
		max_values.insert(-youchi[youchi_next].get_min())
		B[c] = youchi_next
		print(max_values.get_min())

def __starting_point():
	main()
__starting_point()


def main():
	import sys
	input = lambda : sys.stdin.readline().rstrip('\r\n')
	mod = 10 ** 9 + 7
	ans = []
	(n, q) = map(int, input().split())
	y = [[] for _ in range(2 * 10 ** 5)]
	data = [(0, 0)] * n
	import heapq
	for i in range(n):
		(a, b) = map(int, input().split())
		data[i] = (a, b - 1)
		heapq.heappush(y[b - 1], (-a, i))
	max_rate = []
	max_rate_list = [()] * (2 * 10 ** 5)
	for i in range(2 * 10 ** 5):
		if y[i]:
			(s, t) = heapq.heappop(y[i])
			heapq.heappush(max_rate, (-s, t, i))
			heapq.heappush(y[i], (s, t))
			max_rate_list[i] = (-s, t)
	from collections import defaultdict
	ng_num = defaultdict(set)
	for _ in range(q):
		(c, d) = map(int, input().split())
		c -= 1
		d -= 1
		(a, b) = data[c]
		data[c] = (a, d)
		heapq.heappush(y[d], (-a, c))
		ng_num[b].add(c)
		if c in ng_num[d]:
			ng_num[d].discard(c)
		while y[b]:
			(s, t) = heapq.heappop(y[b])
			if t not in ng_num[b]:
				heapq.heappush(max_rate, (-s, t, b))
				heapq.heappush(y[b], (s, t))
				max_rate_list[b] = (-s, t)
				break
		while y[d]:
			(s, t) = heapq.heappop(y[d])
			if t not in ng_num[d]:
				heapq.heappush(max_rate, (-s, t, d))
				heapq.heappush(y[d], (s, t))
				max_rate_list[d] = (-s, t)
				break
		while max_rate:
			(s, t, r) = heapq.heappop(max_rate)
			if t not in ng_num[r] and (s, t) == max_rate_list[r]:
				ans.append(s)
				heapq.heappush(max_rate, (s, t, r))
				break
	print(*ans, sep='\n')
main()


import heapq
(n, q) = map(int, input().split())
belong = [-1 for i in range(n)]
rating = [0 for i in range(n)]
second = [[] for i in range(2 * 10 ** 5 + 5)]
for i in range(n):
	(a, b) = map(int, input().split())
	rating[i] = a
	belong[i] = b
	heapq.heappush(second[b], (-1 * a, i))
first = []
for i in range(2 * 10 ** 5 + 5):
	if second[i]:
		heapq.heappush(first, (-1 * second[i][0][0], second[i][0][1], i))
for i in range(q):
	(c, d) = map(int, input().split())
	before = belong[c - 1]
	belong[c - 1] = d
	heapq.heappush(second[d], (-1 * rating[c - 1], c - 1))
	if second[d][0][1] == c - 1:
		heapq.heappush(first, (rating[c - 1], c - 1, d))
	count = 0
	while second[before] and belong[second[before][0][1]] != before:
		heapq.heappop(second[before])
		count = 1
	if count and second[before]:
		heapq.heappush(first, (-1 * second[before][0][0], second[before][0][1], before))
	while not second[first[0][2]] or second[first[0][2]][0][1] != first[0][1]:
		heapq.heappop(first)
	print(first[0][0])


import heapq
M = 2 * 10 ** 5
(N, Q) = list(map(int, input().split()))
enji = []
for i in range(N):
	enji.append(tuple(map(int, input().split())))
belong = [0] * N
K = [[] for _ in range(M)]
for (i, (a, b)) in enumerate(enji):
	heapq.heappush(K[b - 1], (-a, i))
	belong[i] = b - 1
E = []
for i in range(M):
	if K[i] != []:
		heapq.heappush(E, (K[i][0][0] * -1, K[i][0][1], belong[K[i][0][1]]))

def insert_enji(x, y):
	if K[y] == [] or K[y][0][0] > enji[x][0] * -1:
		heapq.heappush(K[y], (enji[x][0] * -1, x))
		heapq.heappush(E, (K[y][0][0] * -1, K[y][0][1], belong[K[y][0][1]]))
	else:
		heapq.heappush(K[y], (enji[x][0] * -1, x))

def mainte_K(x, y):
	flg = False
	while K[y]:
		if belong[K[y][0][1]] == y:
			break
		else:
			heapq.heappop(K[y])
			flg = True
	if flg == True and K[y] != []:
		heapq.heappush(E, (-K[y][0][0], K[y][0][1], y))

def mainte_E():
	while E:
		if K[E[0][2]] != [] and K[E[0][2]][0] == (E[0][0] * -1, E[0][1]):
			break
		else:
			heapq.heappop(E)
for i in range(Q):
	(c, d) = list(map(int, input().split()))
	c -= 1
	d -= 1
	old = belong[c]
	belong[c] = d
	insert_enji(c, d)
	mainte_K(c, old)
	mainte_E()
	print(E[0][0])


import heapq
(N, Q) = map(int, input().split())
yochien = {}
rate = {}
enzi_rate = {}
enzi_rate_out = {}
result = []
for i in range(1, N + 1):
	(A, B) = map(int, input().split())
	rate[i] = A
	yochien[i] = B
	if B not in enzi_rate:
		enzi_rate[B] = []
	heapq.heappush(enzi_rate[B], -A)
max_enzi = []
heapq.heapify(max_enzi)
max_enzi_out = []
heapq.heapify(max_enzi_out)
for j in enzi_rate:
	heapq.heappush(max_enzi, -enzi_rate[j][0])
for _ in range(Q):
	(C, D) = map(int, input().split())
	if yochien[C] not in enzi_rate_out:
		enzi_rate_out[yochien[C]] = []
	heapq.heappush(enzi_rate_out[yochien[C]], -rate[C])
	if len(enzi_rate_out[yochien[C]]) >= 1 and enzi_rate_out[yochien[C]][0] == enzi_rate[yochien[C]][0]:
		heapq.heappush(max_enzi_out, -enzi_rate_out[yochien[C]][0])
		while len(enzi_rate_out[yochien[C]]) >= 1 and enzi_rate_out[yochien[C]][0] == enzi_rate[yochien[C]][0]:
			heapq.heappop(enzi_rate_out[yochien[C]])
			heapq.heappop(enzi_rate[yochien[C]])
		if len(enzi_rate[yochien[C]]) >= 1:
			heapq.heappush(max_enzi, -enzi_rate[yochien[C]][0])
	yochien[C] = D
	if D not in enzi_rate or len(enzi_rate[D]) == 0:
		enzi_rate[D] = []
		heapq.heappush(max_enzi, rate[C])
	elif -enzi_rate[D][0] < rate[C]:
		heapq.heappush(max_enzi, rate[C])
		heapq.heappush(max_enzi_out, -enzi_rate[D][0])
	heapq.heappush(enzi_rate[D], -rate[C])
	while len(max_enzi_out) >= 1 and max_enzi[0] == max_enzi_out[0]:
		heapq.heappop(max_enzi)
		heapq.heappop(max_enzi_out)
	result.append(max_enzi[0])
for k in range(Q):
	print(result[k])


import sys
import heapq
input = sys.stdin.readline

def main():
	(N, Q) = [int(x) for x in input().split()]
	hsize = 2 * 10 ** 5 + 1
	h = [[] for _ in range(hsize)]
	C = [0] * N
	A = []
	for i in range(N):
		(a, b) = [int(x) for x in input().split()]
		A.append(a)
		heapq.heappush(h[b], (-a, i))
		C[i] = b
	A = tuple(A)
	byodo = []
	for i in range(1, hsize):
		if len(h[i]) == 0:
			continue
		x = h[i][0]
		heapq.heappush(byodo, (-x[0], x[1]))
	ans = []
	for _ in range(Q):
		(c, d) = [int(x) for x in input().split()]
		c -= 1
		cfrom = C[c]
		C[c] = d
		while h[cfrom]:
			x = h[cfrom][0]
			if C[x[1]] != cfrom:
				heapq.heappop(h[cfrom])
				continue
			heapq.heappush(byodo, (-x[0], x[1]))
			break
		heapq.heappush(h[d], (-A[c], c))
		while h[d]:
			x = h[d][0]
			if C[x[1]] != d:
				heapq.heappop(h[d])
				continue
			heapq.heappush(byodo, (-x[0], x[1]))
			break
		while byodo:
			x = byodo[0]
			y = h[C[x[1]]][0]
			if -y[0] != x[0]:
				heapq.heappop(byodo)
				continue
			ans.append(x[0])
			break
	print('\n'.join(map(str, ans)))

def __starting_point():
	main()
__starting_point()


from heapq import *
MAX = 2 * 10 ** 5 + 1
(N, Q) = list(map(int, input().split()))
I = [[] for _ in range(N + 1)]
P = [[[], []] for _ in range(MAX)]
S = [[], []]

def heapdel(l, a):
	if l[0][0] == a:
		heappop(l[0])
		while l[1] and l[1][0] == l[0][0]:
			heappop(l[1])
			heappop(l[0])
	else:
		heappush(l[1], a)

def heapadd(l, a):
	heappush(l[0], a)

def heapmin(l):
	return l[0][0]

def main():
	for i in range(1, N + 1):
		(a, b) = list(map(int, input().split()))
		I[i] += [a, b]
		heapadd(P[b], -a)
	for i in range(1, MAX):
		if P[i][0]:
			heapadd(S, -heapmin(P[i]))
	for i in range(Q):
		(c, d) = list(map(int, input().split()))
		(a, b) = I[c]
		heapdel(S, -heapmin(P[b]))
		heapdel(P[b], -a)
		if P[b][0]:
			heapadd(S, -heapmin(P[b]))
		if P[d][0]:
			heapdel(S, -heapmin(P[d]))
		heapadd(P[d], -a)
		heapadd(S, -heapmin(P[d]))
		I[c][1] = d
		print(heapmin(S))
main()


def main():
	import sys

	def input():
		return sys.stdin.readline().rstrip()
	(n, q) = map(int, input().split())
	from collections import defaultdict
	from heapq import heappush, heappop
	h = defaultdict(lambda : [])
	saikyo = []
	(A, B) = ([], [])
	for i in range(n):
		(a, b) = map(int, input().split())
		A.append(a)
		B.append(b)
		heappush(h[b], (-a, i))
	for i in h:
		x = h[i][0]
		heappush(saikyo, (-x[0], x[1]))
	for i in range(q):
		(c, d) = map(int, input().split())
		c -= 1
		cfrom = B[c]
		B[c] = d
		while h[cfrom]:
			x = h[cfrom][0]
			if B[x[1]] != cfrom:
				heappop(h[cfrom])
				continue
			heappush(saikyo, (-x[0], x[1]))
			break
		heappush(h[d], (-A[c], c))
		while h[d]:
			x = h[d][0]
			if B[x[1]] != d:
				heappop(h[d])
				continue
			heappush(saikyo, (-x[0], x[1]))
			break
		while saikyo:
			x = saikyo[0]
			y = h[B[x[1]]][0]
			if -y[0] != x[0]:
				heappop(saikyo)
				continue
			print(x[0])
			break
	print()

def __starting_point():
	main()
__starting_point()


import heapq
ymax = 200000
(N, Q) = list(map(int, input().split()))
yo = [[] for i in range(ymax + 1)]
ym = []
AB = [(0, 0)]
for i in range(N):
	(A, B) = list(map(int, input().split()))
	AB.append((A, B))
	heapq.heappush(yo[B], (-A, i + 1))
for i in range(1, ymax + 1):
	if yo[i]:
		(mA, c) = yo[i][0]
		heapq.heappush(ym, (-mA, c, i))
for i in range(Q):
	(C, D) = list(map(int, input().split()))
	(A, B) = AB[C]
	AB[C] = (A, D)
	if yo[B][0][1] == C:
		while yo[B] and AB[yo[B][0][1]][1] != B:
			heapq.heappop(yo[B])
		if yo[B]:
			(mA, c) = yo[B][0]
			heapq.heappush(ym, (-mA, c, B))
	heapq.heappush(yo[D], (-A, C))
	(mA, c) = yo[D][0]
	if c == C:
		heapq.heappush(ym, (-mA, c, D))
	while ym:
		if AB[ym[0][1]][1] != ym[0][2]:
			heapq.heappop(ym)
		elif ym[0][1] != yo[ym[0][2]][0][1]:
			heapq.heappop(ym)
		else:
			break
	print(ym[0][0])


import heapq
import sys
input = sys.stdin.readline

class HeapDict:

	def __init__(self):
		self.h = []
		self.d = {}

	def insert(self, x):
		if x not in self.d or self.d[x] == 0:
			heapq.heappush(self.h, x)
		self.d.setdefault(x, 0)
		self.d[x] += 1

	def erase(self, x):
		if x not in self.d or self.d[x] == 0:
			return
		else:
			self.d[x] -= 1
		while self.h:
			if self.d[self.h[0]] == 0:
				heapq.heappop(self.h)
			else:
				break

	def get_min(self):
		return self.h[0]

	def pop(self):
		poped_val = self.h[0]
		self.erase(poped_val)
		return poped_val

	def exist(self, x):
		return x in self.d and self.d[x] > 0

	def show_h(self):
		elems = [v for v in self.h if self.d[v] > 0]
		print(elems)

	def show_d(self):
		print(self.d)

def main():
	(n, q) = map(int, input().split())
	kid_rates = [0] * (n + 1)
	kid_kinders = [0] * (n + 1)
	kinder_kid_rates = [HeapDict() for _ in range(2 * 10 ** 5 + 1)]
	for i in range(n):
		ind = i + 1
		(a, b) = map(int, input().split())
		kid_rates[ind] = a
		kid_kinders[ind] = b
		kinder_kid_rates[b].insert((a * -1, ind))
	each_kinder_rate_maxs = HeapDict()
	for (i, kkr) in enumerate(kinder_kid_rates):
		if kkr.h:
			kkr_max = kkr.get_min()
			each_kinder_rate_maxs.insert((kkr_max[0] * -1, kkr_max[1], i))
	cdl = []
	for _ in range(q):
		(c, d) = map(int, input().split())
		cdl.append((c, d))
	for cd in cdl:
		(c, d) = cd
		to_kinder = d
		kid_rate = kid_rates[c]
		from_kinder = kid_kinders[c]
		from_kinder_max_rate = kinder_kid_rates[from_kinder].get_min()
		each_kinder_rate_maxs.erase((from_kinder_max_rate[0] * -1, from_kinder_max_rate[1], from_kinder))
		kinder_kid_rates[from_kinder].erase((kid_rate * -1, c))
		if kinder_kid_rates[from_kinder].h:
			new_max_rate = kinder_kid_rates[from_kinder].get_min()
			each_kinder_rate_maxs.insert((new_max_rate[0] * -1, new_max_rate[1], from_kinder))
		if kinder_kid_rates[to_kinder].h:
			to_kinder_max_rate = kinder_kid_rates[to_kinder].get_min()
			each_kinder_rate_maxs.erase((to_kinder_max_rate[0] * -1, to_kinder_max_rate[1], to_kinder))
		kinder_kid_rates[to_kinder].insert((kid_rate * -1, c))
		new_to_kinder_max_rate = kinder_kid_rates[to_kinder].get_min()
		each_kinder_rate_maxs.insert((new_to_kinder_max_rate[0] * -1, new_to_kinder_max_rate[1], to_kinder))
		print(each_kinder_rate_maxs.get_min()[0])
		kid_kinders[c] = to_kinder

def __starting_point():
	main()
__starting_point()


def getN():
	return int(input())

def getNM():
	return list(map(int, input().split()))

def getList():
	return list(map(int, input().split()))

def getZList():
	return [int(x) - 1 for x in input().split()]
from collections import defaultdict, deque
import math
import copy
from bisect import bisect_left, bisect_right
import heapq
import sys
input = sys.stdin.readline
INF = 10 ** 17
MOD = 1000000007

class LazyHeap:

	def __init__(self, init_arr=[]):
		self.heap = []
		self.lazy = defaultdict(int)
		self.len = 0
		for init_element in init_arr:
			heapq.heappush(self.heap, init_element)
			self.len += 1

	def __len__(self):
		return self.len

	def push(self, k):
		heapq.heappush(self.heap, k)
		self.len += 1

	def pop(self):
		self._clear()
		return heapq.heappop(self.heap)

	def get(self):
		self._clear()
		return self.heap[0]

	def _clear(self):
		while True:
			cand = self.heap[0]
			if cand in self.lazy and self.lazy[cand] > 0:
				heapq.heappop(self.heap)
				self.lazy[cand] -= 1
			else:
				return

	def remove(self, k):
		self.lazy[k] += 1
		self.len -= 1
N_KINDER = 200200
(n, q) = getList()
kinder = [LazyHeap() for i in range(N_KINDER)]
saikyo = LazyHeap()
saikyo_ref = []
pos_ref = [-1 for i in range(n)]
enji_ref = []
for i in range(n):
	(a, b) = getList()
	b -= 1
	enji_ref.append((-a, b))
	kinder[b].push(-a)
for kin in kinder:
	if kin:
		candidate = kin.get()
		saikyo.push(-candidate)
		saikyo_ref.append(candidate)
	else:
		saikyo_ref.append(0)
for i in range(q):
	(c, d) = getZList()
	mv_rate = enji_ref[c][0]
	prev = enji_ref[c][1]
	nxt = d
	pos_ref[c] = d
	enji_ref[c] = (mv_rate, d)
	kinder[prev].remove(mv_rate)
	(kp, kn) = (kinder[prev], kinder[nxt])
	if not kp:
		saikyo_ref[prev] = 0
		saikyo.remove(-mv_rate)
	elif saikyo_ref[prev] != kp.get():
		saikyo.remove(-mv_rate)
		saikyo.push(-kp.get())
		saikyo_ref[prev] = kp.get()
	kn.push(mv_rate)
	if mv_rate < saikyo_ref[nxt]:
		saikyo.remove(-saikyo_ref[nxt])
		saikyo.push(-mv_rate)
		saikyo_ref[nxt] = mv_rate
	print(saikyo.get())


from heapq import heappop, heappush

class DeletableHeapq:

	def __init__(self, *initial_values: int, is_max_heap: bool=False) -> None:
		self.is_max_heap = is_max_heap
		self.size = 0
		self._set = set()
		self._heap = []
		if initial_values:
			for v in initial_values:
				self.push(v)

	@property
	def top(self):
		while self._heap and self._heap[0] not in self._set:
			heappop(self._heap)
		if not self._heap:
			return None
		return self._heap[0] if not self.is_max_heap else -self._heap[0]

	def pop(self):
		while self._heap and self._heap[0] not in self._set:
			heappop(self._heap)
		if not self._heap:
			return None
		self.size -= 1
		res = heappop(self._heap)
		self._set.discard(res)
		return res if not self.is_max_heap else -res

	def push(self, value):
		if value is None:
			return
		if self.is_max_heap:
			value *= -1
		if value in self._set:
			return
		self.size += 1
		heappush(self._heap, value)
		self._set.add(value)

	def delete(self, value):
		if value is None:
			return
		if self.is_max_heap:
			value *= -1
		if value not in self._set:
			return
		self.size -= 1
		self._set.discard(value)

def main():
	encode_kindy = lambda x, y: (x << 18) + y
	decode_kindy = lambda x: (x >> 18, x & (1 << 18) - 1)
	encode_smarts = lambda x, y, z: (x << 36) + (y << 18) + z
	decode_smarts_rate = lambda x: x >> 36
	(N, _, *X) = list(map(int, open(0).read().split()))
	(AB, CD) = (X[:2 * N], X[2 * N:])
	(rate, belonging) = ([0] * (N + 1), [0] * (N + 1))
	kindy = [DeletableHeapq(is_max_heap=True) for _ in range(200001)]
	for (i, (a, b)) in enumerate(zip(*[iter(AB)] * 2), 1):
		(rate[i], belonging[i]) = (a, b)
		kindy[b].push(encode_kindy(a, i))
	smart_infants = DeletableHeapq(*(encode_smarts(*decode_kindy(k.top), i) for (i, k) in enumerate(kindy) if k.size))
	res = []
	for (c, next_k) in zip(*[iter(CD)] * 2):
		prev_k = belonging[c]
		belonging[c] = next_k
		for k in (prev_k, next_k):
			if kindy[k].size:
				smart_infants.delete(encode_smarts(*decode_kindy(kindy[k].top), k))
		kindy[prev_k].delete(encode_kindy(rate[c], c))
		kindy[next_k].push(encode_kindy(rate[c], c))
		for k in (prev_k, next_k):
			if kindy[k].size:
				smart_infants.push(encode_smarts(*decode_kindy(kindy[k].top), k))
		res.append(decode_smarts_rate(smart_infants.top))
	print('\n'.join(map(str, res)))

def __starting_point():
	main()
__starting_point()


from heapq import heappop, heappush, heapify

class RemovableHeap(list):
	from heapq import heappop, heappush, heapify

	def __init__(self, *args, **kwargs):
		self.unremoved_elements = []

	def remove(self, value):
		heappush(self.unremoved_elements, value)
		while self.unremoved_elements and self.unremoved_elements[0] == self[0]:
			heappop(self.unremoved_elements)
			heappop(self)
(N, Q) = map(int, input().split())
AB = [list(map(int, input().split())) for _ in range(N)]
CD = [list(map(int, input().split())) for _ in range(Q)]
M = 2 * 10 ** 5
maxA = 10 ** 9
for i in range(N):
	AB[i][1] -= 1
for i in range(Q):
	CD[i][0] -= 1
	CD[i][1] -= 1
youchiens = [RemovableHeap() for _ in range(M)]
for (a, b) in AB:
	youchiens[b].append(-a)
for i in range(Q):
	heapify(youchiens[i])
saikyoenjis = RemovableHeap()
for youchien in youchiens:
	if youchien:
		saikyoenjis.append(-youchien[0])
heapify(saikyoenjis)
ans = []
for (c, d) in CD:
	old_youchien = AB[c][1]
	saikyoenjis.remove(-youchiens[old_youchien][0])
	youchiens[old_youchien].remove(-AB[c][0])
	if youchiens[old_youchien]:
		heappush(saikyoenjis, -youchiens[old_youchien][0])
	if youchiens[d]:
		saikyoenjis.remove(-youchiens[d][0])
	heappush(youchiens[d], -AB[c][0])
	heappush(saikyoenjis, -youchiens[d][0])
	ans.append(saikyoenjis[0])
	AB[c][1] = d
print(*ans, sep='\n')


import heapq as hq

class Delheap:

	def __init__(self):
		self.heap = []
		self.deleted = {}

	def __repr__(self):
		return str(self.heap)

	def push(self, x):
		hq.heappush(self.heap, x)

	def pop(self):
		while self.heap:
			x = hq.heappop(self.heap)
			if x in self.deleted and self.deleted[x] > 0:
				self.deleted[x] -= 1
				if self.deleted[x] == 0:
					del self.deleted[x]
				continue
			return x
		return None

	def delete(self, x):
		if x not in self.deleted:
			self.deleted[x] = 1
		else:
			self.deleted[x] += 1

	def peek(self):
		x = self.pop()
		if x != None:
			self.push(x)
		return x

def __starting_point():
	(N, Q) = map(int, input().split())
	shozoku = []
	rate = []
	saikyo = Delheap()
	nurs = [Delheap() for _ in range(2 * 10 ** 5)]
	for _ in range(N):
		(a, b) = map(int, input().split())
		b -= 1
		shozoku.append(b)
		rate.append(a)
		nurs[b].push(-a)
	for i in range(2 * 10 ** 5):
		x = nurs[i].peek()
		if x != None:
			saikyo.push(-x)
	anss = []
	for _ in range(Q):
		(c, d) = map(int, input().split())
		c -= 1
		d -= 1
		nur = shozoku[c]
		saikyo.delete(-nurs[nur].peek())
		nurs[nur].delete(-rate[c])
		t = nurs[nur].peek()
		if t != None:
			saikyo.push(-t)
		shozoku[c] = d
		t = nurs[d].peek()
		if t != None:
			saikyo.delete(-t)
		nurs[d].push(-rate[c])
		saikyo.push(-nurs[d].peek())
		anss.append(saikyo.peek())
	print(*anss, sep='\n')
__starting_point()


import sys
from heapq import heapify, heappop, heappush
from collections import defaultdict
sr = lambda : sys.stdin.readline().rstrip()
ir = lambda : int(sr())
lr = lambda : list(map(int, sr().split()))
(N, Q) = lr()
top = []
left_top = []
infants = [[] for _ in range(2 * 10 ** 5 + 1)]
left = [[] for _ in range(2 * 10 ** 5 + 1)]
dic = defaultdict(tuple)
for i in range(1, N + 1):
	(a, b) = lr()
	heappush(infants[b], (-a, i))
	dic[i] = (a, b)
for i in range(1, 2 * 10 ** 5 + 1):
	if infants[i]:
		(rate, id) = infants[i][0]
		heappush(top, (-rate, id))
for _ in range(Q):
	(c, next) = lr()
	(r, prev) = dic[c]
	dic[c] = (r, next)
	(r3, prev_top) = infants[prev][0]
	heappush(left_top, (-r3, prev_top))
	heappush(left[prev], (-r, c))
	while infants[prev] and left[prev] and (infants[prev][0][1] == left[prev][0][1]):
		heappop(infants[prev])
		heappop(left[prev])
	if infants[prev]:
		(rate, id) = infants[prev][0]
		heappush(top, (-rate, id))
	if infants[next]:
		heappush(left_top, (-infants[next][0][0], infants[next][0][1]))
	heappush(infants[next], (-r, c))
	while left[next] and infants[next][0][1] == left[next][0][1]:
		heappop(infants[next])
		heappop(left[next])
	(r2, id2) = infants[next][0]
	heappush(top, (-r2, id2))
	while left_top and top[0][1] == left_top[0][1]:
		heappop(top)
		heappop(left_top)
	answer = top[0][0]
	print(answer)


import sys
import bisect
import heapq
N_MAX = 2 * 10 ** 5
A_MAX = 10 ** 9
A = []
B = []
BB = [[] for _ in range(N_MAX)]
BBmax = []

def max_rate_in_a_kg(kg):
	while BB[kg]:
		(rate, k) = BB[kg][0]
		if B[k] == kg:
			return -rate
		else:
			heapq.heappop(BB[kg])
	return 0

def max_rate():
	while BBmax:
		(rate, kg_no) = BBmax[0]
		if max_rate_in_a_kg(kg_no) == rate:
			return rate
		else:
			heapq.heappop(BBmax)
	return None

def p():
	for i in range(len(BB)):
		if BB[i] != []:
			print(i, BB[i])

def pp():
	print('BBmax : ', end='')
	for i in range(len(BBmax)):
		print(BBmax[i], end=' ')
	print()

def main():
	(N, Q) = map(int, sys.stdin.readline().split())
	for i in range(N):
		(a, b) = map(int, sys.stdin.readline().split())
		A.append(a)
		B.append(b - 1)
		heapq.heappush(BB[b - 1], (-a, i))
	for kg_no in range(N_MAX):
		rate = max_rate_in_a_kg(kg_no)
		if rate > 0:
			BBmax.append((rate, kg_no))
	heapq.heapify(BBmax)
	for i in range(Q):
		(c, d) = map(int, sys.stdin.readline().split())
		kid_no = c - 1
		after = d - 1
		before = B[kid_no]
		B[kid_no] = after
		heapq.heappush(BB[after], (-A[kid_no], kid_no))
		new_rate_kg = max_rate_in_a_kg(before)
		if new_rate_kg != 0:
			heapq.heappush(BBmax, (new_rate_kg, before))
		new_rate_kg = max_rate_in_a_kg(after)
		if new_rate_kg != 0:
			heapq.heappush(BBmax, (new_rate_kg, after))
		print(max_rate())

def __starting_point():
	main()
__starting_point()


import heapq
(N, Q) = map(int, input().split())
M = 2 * 10 ** 5
belong = []
rate = []
garden = [[] for _ in range(M)]
for c in range(N):
	(A, B) = map(int, input().split())
	B -= 1
	belong.append(B)
	rate.append(A)
	heapq.heappush(garden[B], (-A, c))
strong = []
for i in range(M):
	if garden[i]:
		(A, c) = garden[i][0]
		heapq.heappush(strong, (-A, c, i))
for i in range(Q):
	(C, D) = map(int, input().split())
	C -= 1
	D -= 1
	now = belong[C]
	belong[C] = D
	while garden[now]:
		(A, c) = garden[now][0]
		if belong[c] != now:
			heapq.heappop(garden[now])
		else:
			heapq.heappush(strong, (-A, c, now))
			break
	heapq.heappush(garden[D], (-rate[C], C))
	(A, c) = garden[D][0]
	heapq.heappush(strong, (-A, c, D))
	while strong:
		(A, c, d) = strong[0]
		if belong[c] != d or garden[d][0][1] != c:
			heapq.heappop(strong)
		else:
			print(A)
			break


from heapq import heappop, heappush
from typing import Optional

class DeletableHeapq:
	__slots__ = ['_is_max_heap', '_set', '_heap']

	def __init__(self, *initial_values: int, is_max_heap: bool=False) -> None:
		self._is_max_heap = is_max_heap
		self._set = set()
		self._heap = []
		if initial_values:
			for v in initial_values:
				self.push(v)

	def __len__(self) -> int:
		return len(self._set)

	@property
	def is_empty(self) -> bool:
		return len(self) == 0

	@property
	def top(self) -> Optional[int]:
		while self._heap and self._heap[0] not in self._set:
			heappop(self._heap)
		if not self._heap:
			return None
		return self._heap[0] if not self._is_max_heap else -self._heap[0]

	def push(self, value: int) -> None:
		if self._is_max_heap:
			value = -value
		if value in self._set:
			return
		heappush(self._heap, value)
		self._set.add(value)

	def delete(self, value: int) -> None:
		if self._is_max_heap:
			value = -value
		if value not in self._set:
			return
		self._set.discard(value)

def main():
	(N, _, *X) = list(map(int, open(0).read().split()))
	(AB, CD) = (X[:2 * N], X[2 * N:])
	(rate, belonging) = ([0] * (N + 1), [0] * (N + 1))
	kindy = [DeletableHeapq(is_max_heap=True) for _ in range(200001)]
	for (i, (a, b)) in enumerate(zip(*[iter(AB)] * 2), 1):
		(rate[i], belonging[i]) = ((a << 18) + i, b)
		kindy[b].push(rate[i])
	smarts = DeletableHeapq(*(k.top for k in kindy if not k.is_empty))
	res = []
	for (c, d) in zip(*[iter(CD)] * 2):
		(prev_k, next_k) = (kindy[belonging[c]], kindy[d])
		belonging[c] = d
		for k in (prev_k, next_k):
			if not k.is_empty:
				smarts.delete(k.top)
		prev_k.delete(rate[c])
		next_k.push(rate[c])
		for k in (prev_k, next_k):
			if not k.is_empty:
				smarts.push(k.top)
		res.append(smarts.top >> 18)
	print('\n'.join(map(str, res)))

def __starting_point():
	main()
__starting_point()


import heapq
import sys
input = sys.stdin.readline
(N, Q) = map(int, input().split())
AB = [tuple(map(int, input().split())) for _ in range(N)]
CD = [tuple(map(int, input().split())) for _ in range(Q)]
H = 2 * 10 ** 5
INF = 10 ** 18
rates = [[] for _ in range(H)]
members = [set() for _ in range(H)]
belongs = [-1] * N
for (i, (a, b)) in enumerate(AB):
	b -= 1
	heapq.heappush(rates[b], (-a, i))
	members[b].add(i)
	belongs[i] = b
mxrates = []
for (num, r) in enumerate(rates):
	if len(r) > 0:
		heapq.heappush(mxrates, (-r[0][0], num))
for (c, d) in CD:
	(c, d) = (c - 1, d - 1)
	old = belongs[c]
	belongs[c] = d
	members[old].remove(c)
	members[d].add(c)
	while len(rates[old]) > 0 and rates[old][0][1] not in members[old]:
		heapq.heappop(rates[old])
	if len(rates[old]) > 0:
		heapq.heappush(mxrates, (-rates[old][0][0], old))
	heapq.heappush(rates[d], (-AB[c][0], c))
	heapq.heappush(mxrates, (AB[c][0], d))
	while mxrates:
		(rate, num) = mxrates[0]
		if len(rates[num]) == 0 or -rates[num][0][0] != rate:
			heapq.heappop(mxrates)
		else:
			print(rate)
			break


import sys
sys.setrecursionlimit(10 ** 7)
import math
from copy import copy, deepcopy
from copy import deepcopy as dcp
from operator import itemgetter
from bisect import bisect_left, bisect, bisect_right
from collections import deque
from collections import Counter
from itertools import accumulate
from heapq import heapify, heappop, heappush
from functools import lru_cache

def input():
	return sys.stdin.readline()[:-1]

def printl(li):
	_ = print(*li, sep='\n') if li else None

def argsort(s, return_sorted=False):
	inds = sorted(range(len(s)), key=lambda k: s[k])
	if return_sorted:
		return (inds, [s[i] for i in inds])
	return inds

def alp2num(c, cap=False):
	return ord(c) - 97 if not cap else ord(c) - 65

def num2alp(i, cap=False):
	return chr(i + 97) if not cap else chr(i + 65)

def matmat(A, B):
	(K, N, M) = (len(B), len(A), len(B[0]))
	return [[sum([A[i][k] * B[k][j] for k in range(K)]) for j in range(M)] for i in range(N)]

def matvec(M, v):
	(N, size) = (len(v), len(M))
	return [sum([M[i][j] * v[j] for j in range(N)]) for i in range(size)]

def T(M):
	(n, m) = (len(M), len(M[0]))
	return [[M[j][i] for j in range(n)] for i in range(m)]

def main():
	mod = 1000000007
	(N, Q) = map(int, input().split())
	l = [Counter() for _ in range(2 * 10 ** 5)]
	rates = [[] for _ in range(2 * 10 ** 5)]
	dic = dict()
	for i in range(N):
		(a, b) = map(int, input().split())
		b -= 1
		l[b][a] += 1
		dic[i] = (a, b)
		heappush(rates[b], -a)
	tot = []
	for (b, r) in enumerate(rates):
		if r:
			a = -r[0]
			heappush(tot, (a, b))
	qs = tuple((tuple(map(int, input().split())) for i in range(Q)))
	for (c, d) in qs:
		c -= 1
		d -= 1
		(a, b) = dic[c]
		l[b][a] -= 1
		l[d][a] += 1
		dic[c] = (a, d)
		heappush(rates[d], -a)
		heappush(tot, (a, d))
		rm = -rates[b][0]
		while rates[b] and l[b][-rates[b][0]] == 0:
			heappop(rates[b])
		if rates[b]:
			heappush(tot, (-rates[b][0], b))
		(m, mb) = tot[0]
		while l[mb][m] < 1 or m != -rates[mb][0]:
			heappop(tot)
			(m, mb) = tot[0]
		print(m)

def __starting_point():
	main()
__starting_point()


import sys
import numpy as np
from heapq import heappush, heappop
from bisect import bisect_left as bi_l, bisect_right as bi_r
from collections import deque, Counter, defaultdict
from itertools import combinations, product
import string
import math
inf = float('inf')
MOD = 10 ** 9 + 7

class NumberTheory:

	def __init__(self, n=2 * 10 ** 6, numpy=True):
		self.n = n
		self.np_flg = numpy
		(self.is_prime_number, self.prime_numbers) = self.sieve_of_eratosthenes(n)

	def sieve_of_eratosthenes(self, n):
		if self.np_flg:
			sieve = np.ones(n + 1, dtype=np.int64)
			sieve[:2] = 0
			for i in range(2, int(n ** 0.5) + 1):
				if sieve[i]:
					sieve[i * 2::i] = 0
			prime_numbers = np.flatnonzero(sieve)
		else:
			sieve = [1] * (n + 1)
			sieve[0] = sieve[1] = 0
			for i in range(2, int(n ** 0.5) + 1):
				if not sieve[i]:
					continue
				for j in range(i * 2, n + 1, i):
					sieve[j] = 0
			prime_numbers = [i for i in range(2, n + 1) if sieve[i]]
		return (sieve, prime_numbers)

	def prime_factorize(self, n):
		res = dict()
		if n < 2:
			return res
		border = int(n ** 0.5)
		for p in self.prime_numbers:
			if p > border:
				break
			while n % p == 0:
				res[p] = res.get(p, 0) + 1
				n //= p
			if n == 1:
				return res
		res[n] = 1
		return res

	def prime_factorize_factorial(self, n):
		res = dict()
		for i in range(2, n + 1):
			for (p, c) in self.prime_factorize(i).items():
				res[p] = res.get(p, 0) + c
		return res

	@staticmethod
	def gcd(a, b):
		return gcd(b, a % b) if b else abs(a)

	@staticmethod
	def lcm(a, b):
		return abs(a // gcd(a, b) * b)

	@staticmethod
	def find_divisors(n):
		divisors = []
		for i in range(1, int(n ** 0.5) + 1):
			if n % i:
				continue
			divisors.append(i)
			j = n // i
			if j != i:
				divisors.append(j)
		return divisors

	@staticmethod
	def base_convert(n, b):
		if not n:
			return [0]
		res = []
		while n:
			(n, r) = divmod(n, b)
			if r < 0:
				n += 1
				r -= b
			res.append(r)
		return res

class UnionFind:

	def __init__(self, n=10 ** 6):
		self.root = list(range(n))
		self.height = [0] * n
		self.size = [1] * n

	def find_root(self, u):
		if self.root[u] == u:
			return u
		self.root[u] = self.find_root(self.root[u])
		return self.root[u]

	def unite(self, u, v):
		ru = self.find_root(u)
		rv = self.find_root(v)
		if ru == rv:
			return
		hu = self.height[ru]
		hv = self.height[rv]
		if hu >= hv:
			self.root[rv] = ru
			self.size[ru] += self.size[rv]
			self.height[ru] = max(hu, hv + 1)
		else:
			self.root[ru] = rv
			self.size[rv] += self.size[ru]

class Combinatorics:

	def __init__(self, N=10 ** 9, n=10 ** 6, mod=10 ** 9 + 7, numpy=True):
		self.mod = mod
		self.nCr = dict()
		self.np_flg = numpy
		self.make_mod_tables(N, n)
	sys.setrecursionlimit(10 ** 6)

	def choose(self, n, r, mod=None):
		if r > n or r < 0:
			return 0
		if r == 0:
			return 1
		if (n, r) in self.nCr:
			return self.nCr[n, r]
		if not mod:
			self.nCr[n, r] = self.choose(n - 1, r) + self.choose(n - 1, r - 1)
		else:
			self.nCr[n, r] = (self.choose(n - 1, r, mod) + self.choose(n - 1, r - 1, mod)) % mod
		return self.nCr[n, r]

	def cumprod(self, a):
		p = self.mod
		l = len(a)
		sql = int(np.sqrt(l) + 1)
		a = np.resize(a, sql ** 2).reshape(sql, sql)
		for i in range(sql - 1):
			a[:, i + 1] *= a[:, i]
			a[:, i + 1] %= p
		for i in range(sql - 1):
			a[i + 1] *= a[i, -1]
			a[i + 1] %= p
		return np.ravel(a)[:l]

	def make_mod_tables(self, N, n):
		p = self.mod
		if self.np_flg:
			fac = np.arange(n + 1)
			fac[0] = 1
			fac = self.cumprod(fac)
			ifac = np.arange(n + 1, 0, -1)
			ifac[0] = pow(int(fac[-1]), p - 2, p)
			ifac = self.cumprod(ifac)[n::-1]
			n_choose = np.arange(N + 1, N - n, -1)
			n_choose[0] = 1
			n_choose[1:] = self.cumprod(n_choose[1:]) * ifac[1:n + 1] % p
		else:
			fac = [None] * (n + 1)
			fac[0] = 1
			for i in range(n):
				fac[i + 1] = fac[i] * (i + 1) % p
			ifac = [None] * (n + 1)
			ifac[n] = pow(fac[n], p - 2, p)
			for i in range(n, 0, -1):
				ifac[i - 1] = ifac[i] * i % p
			n_choose = [None] * (n + 1)
			n_choose[0] = 1
			for i in range(n):
				n_choose[i + 1] = n_choose[i] * (N - i) % p
			for i in range(n + 1):
				n_choose[i] = n_choose[i] * ifac[i] % p
		(self.fac, self.ifac, self.mod_n_choose) = (fac, ifac, n_choose)

	def mod_choose(self, n, r):
		return self.fac[n] * self.ifac[r] % self.mod * self.ifac[n - r] % self.mod

def z_algorithm(s):
	n = len(s)
	a = [0] * n
	a[0] = n
	l = r = -1
	for i in range(1, n):
		if r >= i:
			a[i] = min(a[i - l], r - i)
		while i + a[i] < n and s[i + a[i]] == s[a[i]]:
			a[i] += 1
		if i + a[i] >= r:
			(l, r) = (i, i + a[i])
	return a

class ABC001:

	def A():
		(h1, h2) = map(int, sys.stdin.read().split())
		print(h1 - h2)

	def B():
		pass

	def C():
		pass

	def D():
		pass

class ABC002:

	def A():
		(x, y) = map(int, sys.stdin.readline().split())
		print(max(x, y))

	def B():
		vowels = set('aeiou')
		s = sys.stdin.readline().rstrip()
		t = ''
		for c in s:
			if c in vowels:
				continue
			t += c
		print(t)

	def C():
		(*coords,) = map(int, sys.stdin.readline().split())

		def triangle_area(x0, y0, x1, y1, x2, y2):
			x1 -= x0
			x2 -= x0
			y1 -= y0
			y2 -= y0
			return abs(x1 * y2 - x2 * y1) / 2
		print(triangle_area(*coords))

	def D():
		(n, m) = map(int, sys.stdin.readline().split())
		edges = set()
		for _ in range(m):
			(x, y) = map(int, sys.stdin.readline().split())
			x -= 1
			y -= 1
			edges.add((x, y))
		cand = []
		for i in range(1, 1 << n):
			s = [j for j in range(n) if i >> j & 1]
			for (x, y) in combinations(s, 2):
				if (x, y) not in edges:
					break
			else:
				cand.append(len(s))
		print(max(cand))

class ABC003:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print((n + 1) * 5000)

	def B():
		atcoder = set('atcoder')
		(s, t) = sys.stdin.read().split()
		for i in range(len(s)):
			if s[i] == t[i]:
				continue
			if s[i] == '@' and t[i] in atcoder:
				continue
			if t[i] == '@' and s[i] in atcoder:
				continue
			print('You will lose')
			return
		print('You can win')

	def C():
		(n, k, *r) = map(int, sys.stdin.read().split())
		res = 0
		for x in sorted(r)[-k:]:
			res = (res + x) / 2
		print(res)

	def D():
		pass

class ABC004:

	def A():
		print(int(sys.stdin.readline().rstrip()) * 2)

	def B():
		c = [sys.stdin.readline().rstrip() for _ in range(4)]
		for l in c[::-1]:
			print(l[::-1])

	def C():
		n = int(sys.stdin.readline().rstrip())
		n %= 30
		res = list(range(1, 7))
		for i in range(n):
			i %= 5
			(res[i], res[i + 1]) = (res[i + 1], res[i])
		print(''.join(map(str, res)))

	def D():
		pass

class ABC005:

	def A():
		(x, y) = map(int, sys.stdin.readline().split())
		print(y // x)

	def B():
		(n, *t) = map(int, sys.stdin.read().split())
		print(min(t))

	def C():
		t = int(sys.stdin.readline().rstrip())
		n = int(sys.stdin.readline().rstrip())
		a = [int(x) for x in sys.stdin.readline().split()]
		m = int(sys.stdin.readline().rstrip())
		b = [int(x) for x in sys.stdin.readline().split()]
		i = 0
		for p in b:
			if i == n:
				print('no')
				return
			while p - a[i] > t:
				i += 1
				if i == n:
					print('no')
					return
			if a[i] > p:
				print('no')
				return
			i += 1
		print('yes')

	def D():
		n = int(sys.stdin.readline().rstrip())
		d = np.array([sys.stdin.readline().split() for _ in range(n)], np.int64)
		s = d.cumsum(axis=0).cumsum(axis=1)
		s = np.pad(s, 1)
		max_del = np.zeros((n + 1, n + 1), dtype=np.int64)
		for y in range(1, n + 1):
			for x in range(1, n + 1):
				max_del[y, x] = np.amax(s[y:n + 1, x:n + 1] - s[0:n - y + 1, x:n + 1] - s[y:n + 1, 0:n - x + 1] + s[0:n - y + 1, 0:n - x + 1])
		res = np.arange(n ** 2 + 1)[:, None]
		i = np.arange(1, n + 1)
		res = max_del[i, np.minimum(res // i, n)].max(axis=1)
		q = int(sys.stdin.readline().rstrip())
		p = np.array(sys.stdin.read().split(), dtype=np.int64)
		print(*res[p], sep='\n')

class ABC006:

	def A():
		n = sys.stdin.readline().rstrip()
		if '3' in n:
			print('YES')
		elif int(n) % 3 == 0:
			print('YES')
		else:
			print('NO')

	def B():
		mod = 10007
		t = [0, 0, 1]
		for _ in range(1001001):
			t.append(t[-1] + t[-2] + t[-3])
			t[-1] %= mod
		n = int(sys.stdin.readline().rstrip())
		print(t[n - 1])

	def C():
		(n, m) = map(int, sys.stdin.readline().split())
		cnt = [0, 0, 0]
		if m == 1:
			cnt = [-1, -1, -1]
		else:
			if m & 1:
				m -= 3
				cnt[1] += 1
				n -= 1
			cnt[2] = m // 2 - n
			cnt[0] = n - cnt[2]
		if cnt[0] < 0 or cnt[1] < 0 or cnt[2] < 0:
			print(-1, -1, -1)
		else:
			print(*cnt, sep=' ')

	def D():
		(n, *c) = map(int, sys.stdin.read().split())
		lis = [inf] * n
		for x in c:
			lis[bi_l(lis, x)] = x
		print(n - bi_l(lis, inf))

class ABC007:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print(n - 1)

	def B():
		s = sys.stdin.readline().rstrip()
		if s == 'a':
			print(-1)
		else:
			print('a')

	def C():
		(r, c) = map(int, sys.stdin.readline().split())
		(sy, sx) = map(int, sys.stdin.readline().split())
		(gy, gx) = map(int, sys.stdin.readline().split())
		sy -= 1
		sx -= 1
		gy -= 1
		gx -= 1
		maze = [sys.stdin.readline().rstrip() for _ in range(r)]
		queue = deque([(sy, sx)])
		dist = np.full((r, c), np.inf)
		dist[sy, sx] = 0
		while queue:
			(y, x) = queue.popleft()
			for (i, j) in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
				i += y
				j += x
				if maze[i][j] == '#' or dist[i, j] != np.inf:
					continue
				dist[i, j] = dist[y, x] + 1
				queue.append((i, j))
		print(int(dist[gy, gx]))

	def D():
		pass

class ABC008:

	def A():
		(s, t) = map(int, sys.stdin.readline().split())
		print(t - s + 1)

	def B():
		(n, *s) = sys.stdin.read().split()
		res = defaultdict(int)
		for name in s:
			res[name] += 1
		print(sorted(res.items(), key=lambda x: x[1])[-1][0])

	def C():
		(n, *a) = map(int, sys.stdin.read().split())
		a = np.array(a)
		c = n - np.count_nonzero(a[:, None] % a, axis=1)
		print(np.sum((c + 1) // 2 / c))

	def D():
		pass

class ABC009:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print((n + 1) // 2)

	def B():
		(n, *a) = map(int, sys.stdin.read().split())
		print(sorted(set(a))[-2])

	def C():
		(n, k) = map(int, sys.stdin.readline().split())
		s = list(sys.stdin.readline().rstrip())
		cost = [1] * n
		r = k
		for i in range(n - 1):
			q = []
			for j in range(i + 1, n):
				if s[j] < s[i] and cost[i] + cost[j] <= r:
					heappush(q, (s[j], cost[i] + cost[j], -j))
			if not q:
				continue
			(_, c, j) = heappop(q)
			j = -j
			(s[i], s[j]) = (s[j], s[i])
			r -= c
			cost[i] = cost[j] = 0
		print(''.join(s))

	def D():
		pass

class ABC010:

	def A():
		print(sys.stdin.readline().rstrip() + 'pp')

	def B():
		(n, *a) = map(int, sys.stdin.read().split())
		tot = 0
		for x in a:
			c = 0
			while x % 2 == 0 or x % 3 == 2:
				x -= 1
				c += 1
			tot += c
		print(tot)

	def C():
		(sx, sy, gx, gy, t, v, n, *xy) = map(int, sys.stdin.read().split())
		(x, y) = np.array(xy).reshape(-1, 2).T

		def dist(x1, y1, x2, y2):
			return np.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
		ans = 'YES' if (dist(sx, sy, x, y) + dist(x, y, gx, gy) <= v * t).any() else 'NO'
		print(ans)

	def D():
		pass

class ABC011:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print(n % 12 + 1)

	def B():
		s = sys.stdin.readline().rstrip()
		print(s[0].upper() + s[1:].lower())

	def C():
		(n, *ng) = map(int, sys.stdin.read().split())
		ng = set(ng)
		if n in ng:
			print('NO')
		else:
			r = 100
			while n > 0:
				if r == 0:
					print('NO')
					return
				for i in range(3, 0, -1):
					if n - i in ng:
						continue
					n -= i
					r -= 1
					break
				else:
					print('NO')
					return
			print('YES')

	def D():
		pass

class ABC040:

	def A():
		(n, x) = map(int, sys.stdin.readline().split())
		print(min(x - 1, n - x))

	def B():
		n = int(sys.stdin.readline().rstrip())
		res = inf
		for i in range(1, int(n ** 0.5) + 1):
			res = min(res, n // i - i + n % i)
		print(res)

	def C():
		(n, *h) = map(int, sys.stdin.read().split())
		h = [h[0]] + h
		cost = [None] * (n + 1)
		cost[0] = cost[1] = 0
		for i in range(2, n + 1):
			cost[i] = min(cost[i - 2] + abs(h[i] - h[i - 2]), cost[i - 1] + abs(h[i] - h[i - 1]))
		print(cost[n])

	def D():
		pass

class ABC041:

	def A():
		(s, i) = sys.stdin.read().split()
		i = int(i)
		print(s[i - 1])

	def B():
		(a, b, c) = map(int, sys.stdin.readline().split())
		ans = a * b % MOD * c % MOD
		print(ans)

	def C():
		(n, *a) = map(int, sys.stdin.read().split())
		for (i, h) in sorted(enumerate(a), key=lambda x: -x[1]):
			print(i + 1)

	def D():
		(n, m, *xy) = map(int, sys.stdin.read().split())
		(*xy,) = zip(*[iter(xy)] * 2)
		edges = [0] * n
		for (x, y) in xy:
			x -= 1
			y -= 1
			edges[x] |= 1 << y
		comb = [None] * (1 << n)
		comb[0] = 1

		def count(edges, bit):
			if comb[bit] is not None:
				return comb[bit]
			comb[bit] = 0
			for i in range(n):
				if bit >> i & 1 and (not edges[i]):
					nxt_bit = bit & ~(1 << i)
					nxt_edges = edges.copy()
					for j in range(n):
						nxt_edges[j] &= ~(1 << i)
					cnt = count(nxt_edges, nxt_bit)
					comb[bit] += cnt
			return comb[bit]
		print(count(edges, (1 << n) - 1))

class ABC042:

	def A():
		a = [int(x) for x in sys.stdin.readline().split()]
		c = Counter(a)
		print('YES' if c[5] == 2 and c[7] == 1 else 'NO')

	def B():
		(n, l, *s) = sys.stdin.read().split()
		print(''.join(sorted(s)))

	def C():
		(n, k, *d) = sys.stdin.read().split()
		l = len(n)
		ok = sorted(set(string.digits) - set(d))
		cand = [int(''.join(p)) for p in product(ok, repeat=l)] + [int(min((x for x in ok if x > '0')) + min(ok) * l)]
		print(cand[bi_l(cand, int(n))])

	def D():
		(h, w, a, b) = map(int, sys.stdin.read().split())
		combinatorics = Combinatorics(n=2 * 10 ** 5, mod=MOD, numpy=True)
		tot = combinatorics.mod_choose(h + w - 2, h - 1)
		i = np.arange(h - a, h)
		ng = np.sum(combinatorics.mod_choose(i + b - 1, i) * combinatorics.mod_choose(h - i + w - b - 2, h - 1 - i) % MOD)
		tot -= ng
		tot %= MOD
		print(tot)

class ABC043:

	def A():
		n = int(sys.stdin.readline().rstrip())
		print((1 + n) * n // 2)

	def B():
		s = sys.stdin.readline().rstrip()
		t = ''
		for c in s:
			if c == 'B':
				t = t[:-1]
			else:
				t += c
		print(t)

	def C():
		(n, *a) = map(int, sys.stdin.read().split())
		a = np.array(a)
		x = np.around(a.sum() / n).astype(int)
		print(np.sum((a - x) ** 2))

	def D():
		s = sys.stdin.readline().rstrip()
		n = len(s)
		for i in range(n - 1):
			if s[i] == s[i + 1]:
				print(i + 1, i + 2)
				return
		for i in range(n - 2):
			if s[i] == s[i + 2]:
				print(i + 1, i + 3)
				return
		print(-1, -1)

class ABC170:

	def A():
		x = [int(x) for x in sys.stdin.readline().split()]
		for i in range(5):
			if x[i] != i + 1:
				print(i + 1)
				break

	def B():
		(x, y) = map(int, sys.stdin.readline().split())
		print('Yes' if 2 * x <= y <= 4 * x and y % 2 == 0 else 'No')

	def C():
		(x, n, *p) = map(int, sys.stdin.read().split())
		a = list(set(range(102)) - set(p))
		a = [(abs(y - x), y) for y in a]
		print(sorted(a)[0][1])

	def D():
		(n, *a) = map(int, sys.stdin.read().split())
		cand = set(a)
		cnt = 0
		for (x, c) in sorted(Counter(a).items()):
			cnt += c == 1 and x in cand
			cand -= set(range(x * 2, 10 ** 6 + 1, x))
		print(cnt)

	def E():
		(n, q) = map(int, sys.stdin.readline().split())
		queue = []
		m = 2 * 10 ** 5
		infants = [[] for _ in range(m)]
		highest_rate = [None] * m
		where = [None] * n
		rate = [None] * n

		def entry(i, k):
			where[i] = k
			while infants[k]:
				(r, j) = heappop(infants[k])
				if where[j] != k or j == i:
					continue
				if rate[i] >= -r:
					highest_rate[k] = rate[i]
					heappush(queue, (rate[i], k, i))
				heappush(infants[k], (r, j))
				break
			else:
				highest_rate[k] = rate[i]
				heappush(queue, (rate[i], k, i))
			heappush(infants[k], (-rate[i], i))

		def transfer(i, k):
			now = where[i]
			while infants[now]:
				(r, j) = heappop(infants[now])
				if where[j] != now or j == i:
					continue
				if highest_rate[now] != -r:
					highest_rate[now] = -r
					heappush(queue, (-r, now, j))
				heappush(infants[now], (r, j))
				break
			else:
				highest_rate[now] = None
			entry(i, k)

		def inquire():
			while True:
				(r, k, i) = heappop(queue)
				if where[i] != k or r != highest_rate[k]:
					continue
				heappush(queue, (r, k, i))
				return r
		for i in range(n):
			(a, b) = map(int, sys.stdin.readline().split())
			rate[i] = a
			entry(i, b - 1)
		for _ in range(q):
			(c, d) = map(int, sys.stdin.readline().split())
			transfer(c - 1, d - 1)
			print(inquire())

	def F():
		pass

class ABC171:

	def A():
		c = sys.stdin.readline().rstrip()
		print('A' if c < 'a' else 'a')

	def B():
		(n, k, *p) = map(int, sys.stdin.read().split())
		print(sum(sorted(p)[:k]))

	def C():
		n = int(sys.stdin.readline().rstrip())
		n -= 1
		l = 1
		while True:
			if n < pow(26, l):
				break
			n -= pow(26, l)
			l += 1
		res = ''.join([chr(ord('a') + d) for d in NumberTheory.base_convert(n, 26)][::-1])
		res = 'a' * (l - len(res)) + res
		print(res)

	def D():
		n = int(sys.stdin.readline().rstrip())
		a = [int(x) for x in sys.stdin.readline().split()]
		s = sum(a)
		cnt = Counter(a)
		q = int(sys.stdin.readline().rstrip())
		for _ in range(q):
			(b, c) = map(int, sys.stdin.readline().split())
			s += (c - b) * cnt[b]
			print(s)
			cnt[c] += cnt[b]
			cnt[b] = 0

	def E():
		(n, *a) = map(int, sys.stdin.read().split())
		s = 0
		for x in a:
			s ^= x
		b = map(lambda x: x ^ s, a)
		print(*b, sep=' ')

	def F():
		pass

class ABC172:

	def A():
		pass

	def B():
		pass

	def C():
		pass

	def D():
		pass

	def E():
		pass

	def F():
		pass

class ABC173:

	def A():
		n = int(sys.stdin.readline().rstrip())
		charge = (n + 999) // 1000 * 1000 - n
		print(charge)

	def B():
		(n, *s) = sys.stdin.read().split()
		c = Counter(s)
		for v in 'AC, WA, TLE, RE'.split(', '):
			print(f'{v} x {c[v]}')

	def C():
		(h, w, k) = map(int, sys.stdin.readline().split())
		c = [sys.stdin.readline().rstrip() for _ in range(h)]
		tot = 0
		for i in range(1 << h):
			for j in range(1 << w):
				cnt = 0
				for y in range(h):
					for x in range(w):
						if i >> y & 1 or j >> x & 1:
							continue
						cnt += c[y][x] == '#'
				tot += cnt == k
		print(tot)

	def D():
		(n, *a) = map(int, sys.stdin.read().split())
		a.sort(reverse=True)
		res = a[0] + sum(a[1:1 + (n - 2) // 2]) * 2 + a[1 + (n - 2) // 2] * (n & 1)
		print(res)

	def E():
		MOD = 10 ** 9 + 7
		(n, k, *a) = map(int, sys.stdin.read().split())
		minus = [x for x in a if x < 0]
		plus = [x for x in a if x > 0]
		if len(plus) + len(minus) // 2 * 2 >= k:
			(*minus,) = map(abs, minus)
			minus.sort(reverse=True)
			plus.sort(reverse=True)
			cand = []
			if len(minus) & 1:
				minus = minus[:-1]
			for i in range(0, len(minus) - 1, 2):
				cand.append(minus[i] * minus[i + 1] % MOD)
			if k & 1:
				res = plus[0]
				plus = plus[1:]
			else:
				res = 1
			if len(plus) & 1:
				plus = plus[:-1]
			for i in range(0, len(plus) - 1, 2):
				cand.append(plus[i] * plus[i + 1] % MOD)
			cand.sort(reverse=True)
			for x in cand[:k // 2]:
				res *= x
				res %= MOD
			print(res)
		elif 0 in a:
			print(0)
		else:
			cand = sorted(map(abs, a))
			res = 1
			for i in range(k):
				res *= cand[i]
				res %= MOD
			res = MOD - res
			print(res)
			pass

	def F():
		pass

def __starting_point():
	ABC170.E()
__starting_point()


from collections import defaultdict
import heapq
INF_MAX = 10 ** 10

def set_remove(hp, dct, x):
	dct[x] += 1

def set_getmin(hp, dct):
	while True:
		if len(hp) == 0:
			return INF_MAX
		a = hp[0]
		if dct[a]:
			dct[a] -= 1
			heapq.heappop(hp)
		else:
			return a
(N, Q) = map(int, input().split())
A = [0] * N
B = [0] * N
C = [0] * Q
D = [0] * Q
E = [-1] * N
G = set()
hps = dict()
dcts = dict()
(b, c, d, FROM, TO) = (0, 0, 0, 0, 0)
for i in range(N):
	(A[i], b) = map(int, input().split())
	b -= 1
	B[i] = b
	G.add(b)
for i in range(Q):
	(c, d) = map(int, input().split())
	c -= 1
	d -= 1
	C[i] = c
	D[i] = d
	G.add(d)
G.add(-1)
for g in G:
	hps[g] = list()
	dcts[g] = defaultdict(int)
for i in range(N):
	b = B[i]
	heapq.heappush(hps[b], -A[i])
	E[i] = b
hps[-1] = [-hps[b][0] for b in set(B)]
heapq.heapify(hps[-1])
for i in range(Q):
	c = C[i]
	FROM = E[c]
	TO = D[i]
	E[c] = TO
	c = A[c]
	b = set_getmin(hps[FROM], dcts[FROM])
	b *= -1
	if c == b:
		set_remove(hps[-1], dcts[-1], c)
		set_remove(hps[FROM], dcts[FROM], -c)
		d = set_getmin(hps[FROM], dcts[FROM])
		if d != INF_MAX:
			d *= -1
			heapq.heappush(hps[-1], d)
	else:
		set_remove(hps[FROM], dcts[FROM], -c)
	b = set_getmin(hps[TO], dcts[TO])
	if b != INF_MAX:
		b *= -1
		if c > b:
			set_remove(hps[-1], dcts[-1], b)
			heapq.heappush(hps[-1], c)
	else:
		heapq.heappush(hps[-1], c)
	heapq.heappush(hps[TO], -c)
	print(set_getmin(hps[-1], dcts[-1]))


import sys
from heapq import heapify, heappop, heappushpop, heappush
M = 2 * 10 ** 5
input = sys.stdin.readline
(N, Q) = list(map(int, input().split()))
rates = [0] * N
wheres = [0] * N
kgs = [[(0, 0)] for _ in range(M)]
for i in range(N):
	(a, b) = list(map(int, input().split()))
	rates[i] = a
	wheres[i] = b - 1
	heappush(kgs[b - 1], (-a, i))
rankers = []
for kg in kgs:
	v = kg[0]
	if v[0] != 0:
		heappush(rankers, (-v[0], v[1], wheres[v[1]]))

def fetch_max(i):
	while True:
		v = kgs[i][0]
		if v[0] == 0 or wheres[v[1]] == i:
			return v
		heappop(kgs[i])

def fetch_min():
	while True:
		v = rankers[0]
		w = fetch_max(v[2])
		if w[0] != 0 and w[1] == v[1]:
			return v
		heappop(rankers)

def solve():
	for _ in range(Q):
		(c, d) = list(map(int, input().split()))
		(ibkg, iakg) = (wheres[c - 1], d - 1)
		wheres[c - 1] = d - 1
		heappush(kgs[iakg], (-rates[c - 1], c - 1))
		bef = fetch_max(ibkg)
		heappush(rankers, (-bef[0], bef[1], ibkg))
		aft = kgs[iakg][0]
		heappush(rankers, (-aft[0], aft[1], iakg))
		print(fetch_min()[0])

def __starting_point():
	solve()
__starting_point()


def main():
	import heapq
	import sys
	input = sys.stdin.readline
	(N, Q) = map(int, input().split())
	AB = [tuple(map(int, input().split())) for _ in range(N)]
	CD = [tuple(map(int, input().split())) for _ in range(Q)]
	maximum = 2 * 10 ** 5
	B = [[] for _ in range(maximum)]
	member = [set() for _ in range(maximum)]
	belongs = [-1] * N
	for (i, (a, b)) in enumerate(AB):
		b -= 1
		heapq.heappush(B[b], (-a, i))
		member[b].add(i)
		belongs[i] = b
	maximum_list = []
	for (i, b) in enumerate(B):
		if len(b) > 0:
			heapq.heappush(maximum_list, (-b[0][0], i))
	Inf = [0] * maximum
	for (c, d) in CD:
		c -= 1
		d -= 1
		before = belongs[c]
		belongs[c] = d
		member[before].remove(c)
		member[d].add(c)
		for i in Inf:
			if len(B[before]) <= 0:
				break
			if B[before][0][1] in member[before]:
				break
			else:
				heapq.heappop(B[before])
		if len(B[before]) > 0:
			heapq.heappush(maximum_list, (-B[before][0][0], before))
		heapq.heappush(B[d], (-AB[c][0], c))
		heapq.heappush(maximum_list, (AB[c][0], d))
		for i in Inf:
			(minmum, num) = maximum_list[0]
			if len(B[num]) == 0 or -B[num][0][0] != minmum:
				heapq.heappop(maximum_list)
			else:
				print(minmum)
				break
main()


import sys
readline = sys.stdin.readline
from collections import defaultdict as ddict
import heapq as hq
(N, Q) = list(map(int, readline().split()))
NN = 2 * 10 ** 5
infants = [None] * (N + 1)
kinda = [[] for i in range(NN + 1)]
for i in range(N):
	(a, b) = list(map(int, readline().split()))
	infants[i + 1] = [a, b]
	hq.heappush(kinda[b], (-a, i + 1))
all_kinda = []
for i in range(len(kinda)):
	if kinda[i]:
		hq.heappush(all_kinda, (-1 * kinda[i][0][0], i))

def search_max_rate_from_kinda(x):
	q = kinda[x]
	while q:
		(rate, infant_id) = q[0]
		if infants[infant_id][1] != x:
			hq.heappop(q)
		else:
			return -rate
	return -1
for i in range(Q):
	(target, new_kinda_id) = list(map(int, readline().split()))
	(rate, old_kinda_id) = infants[target]
	infants[target][1] = new_kinda_id
	hq.heappush(kinda[new_kinda_id], (-rate, target))
	old_kinda_rate = search_max_rate_from_kinda(old_kinda_id)
	if old_kinda_rate != -1:
		hq.heappush(all_kinda, (old_kinda_rate, old_kinda_id))
	new_kinda_rate = search_max_rate_from_kinda(new_kinda_id)
	if new_kinda_rate != -1:
		hq.heappush(all_kinda, (new_kinda_rate, new_kinda_id))
	while all_kinda:
		(weakest_rate, kinda_id) = all_kinda[0]
		current_max_rate = search_max_rate_from_kinda(kinda_id)
		if weakest_rate != current_max_rate:
			hq.heappop(all_kinda)
		else:
			print(weakest_rate)
			break


def solve():
	import heapq
	M = 2 * 10 ** 5
	(N, Q) = list(map(int, input().split()))
	(As, Bs) = ([], [])
	yochien = [list() for _ in range(M)]
	for i in range(N):
		(a, b) = list(map(int, input().split()))
		b = b - 1
		(As.append(a), Bs.append(b))
		heapq.heappush(yochien[b], (-a, i))
	top = []
	for m in range(M):
		if yochien[m]:
			heapq.heappush(top, (-yochien[m][0][0], yochien[m][0][1], m))
	for _ in range(Q):
		(c, d) = list(map(int, input().split()))
		(c, d) = (c - 1, d - 1)
		before = Bs[c]
		Bs[c] = d
		heapq.heappush(yochien[d], (-As[c], c))
		if yochien[d][0][1] == c:
			heapq.heappush(top, (As[c], c, d))
		flag = False
		while yochien[before] and Bs[yochien[before][0][1]] != before:
			heapq.heappop(yochien[before])
			flag = True
		if flag and yochien[before]:
			heapq.heappush(top, (-yochien[before][0][0], yochien[before][0][1], before))
		while not yochien[top[0][2]] or yochien[top[0][2]][0][1] != top[0][1]:
			heapq.heappop(top)
		print(top[0][0])

def __starting_point():
	solve()
__starting_point()


import sys
import math
import fractions
import heapq
import copy
from collections import defaultdict
stdin = sys.stdin
ns = lambda : stdin.readline().rstrip()
ni = lambda : int(stdin.readline().rstrip())
nm = lambda : map(int, stdin.readline().split())
nl = lambda : list(map(int, stdin.readline().split()))

class My_heapavi:

	def __init__(self):
		self.p = list()
		self.q = list()
		self.p2 = list()
		self.q2 = list()

	def insert(self, x):
		heapq.heappush(self.p, x)
		heapq.heappush(self.p2, -x)
		return

	def erase(self, x):
		heapq.heappush(self.q, x)
		heapq.heappush(self.q2, -x)
		return

	def minimum(self):
		while self.q and self.p[0] == self.q[0]:
			heapq.heappop(self.p)
			heapq.heappop(self.q)
		return self.p[0]

	def maximum(self):
		while self.q2 and self.p2[0] == self.q2[0]:
			heapq.heappop(self.p2)
			heapq.heappop(self.q2)
		return -self.p2[0]

	def size(self):
		return len(self.p) - len(self.q)
s = [My_heapavi() for i in range(200005)]
maxs = My_heapavi()

def getmax(i):
	if s[i].size() == 0:
		return -1
	return s[i].maximum()

def addYouchien(i):
	x = getmax(i)
	if x == -1:
		return
	maxs.insert(x)

def delYouchien(i):
	x = getmax(i)
	if x == -1:
		return
	maxs.erase(x)

def addEnji(i, x):
	delYouchien(i)
	s[i].insert(x)
	addYouchien(i)

def delEnji(i, x):
	delYouchien(i)
	s[i].erase(x)
	addYouchien(i)
(N, Q) = nm()
a = [0 for i in range(200005)]
b = [0 for i in range(200005)]
for i in range(N):
	(a[i], b[i]) = nm()
	addEnji(b[i], a[i])
for i in range(Q):
	(c, d) = nm()
	c -= 1
	delEnji(b[c], a[c])
	b[c] = d
	addEnji(b[c], a[c])
	print(maxs.minimum())


import sys
MOD = 10 ** 9 + 7
INF = 10 ** 9
PI = 3.141592653589793

def read_str():
	return sys.stdin.readline().strip()

def read_int():
	return int(sys.stdin.readline().strip())

def read_ints():
	return map(int, sys.stdin.readline().strip().split())

def read_ints2(x):
	return map(lambda num: int(num) - x, sys.stdin.readline().strip().split())

def read_str_list():
	return list(sys.stdin.readline().strip().split())

def read_int_list():
	return list(map(int, sys.stdin.readline().strip().split()))

def GCD(a: int, b: int) -> int:
	return b if a % b == 0 else GCD(b, a % b)

def LCM(a: int, b: int) -> int:
	return a * b // GCD(a, b)
from heapq import heappop, heappush

def Main():
	(n, q) = read_ints()
	num = 2 * 10 ** 5
	kindergarten = [[] for _ in range(num)]
	rating = [0] * n
	now = [0] * n
	for i in range(n):
		(a, b) = read_ints()
		heappush(kindergarten[~-b], (-a, i))
		rating[i] = a
		now[i] = ~-b
	ranking = []
	for j in range(num):
		if kindergarten[j]:
			(a, i) = kindergarten[j][0]
			heappush(ranking, (-a, i))
	for _ in range(q):
		(c, d) = read_ints()
		last = now[~-c]
		now[~-c] = ~-d
		heappush(kindergarten[~-d], (-rating[~-c], ~-c))
		while kindergarten[last] and now[kindergarten[last][0][1]] != last:
			heappop(kindergarten[last])
		while kindergarten[~-d] and now[kindergarten[~-d][0][1]] != ~-d:
			heappop(kindergarten[~-d])
		if kindergarten[last]:
			(a, i) = kindergarten[last][0]
			heappush(ranking, (-a, i))
		if kindergarten[~-d]:
			(a, i) = kindergarten[~-d][0]
			heappush(ranking, (-a, i))
		while ranking and kindergarten[now[ranking[0][1]]][0][1] != ranking[0][1]:
			heappop(ranking)
		print(ranking[0][0])

def __starting_point():
	Main()
__starting_point()


3
import heapq
from collections import defaultdict

def remove(hq, belongs, maxs, pd):
	while hq:
		if belongs[hq[0][1]] != pd:
			heapq.heappop(hq)
		else:
			heapq.heappush(maxs, (-hq[0][0], hq[0][1], pd))
			break

def main():
	(n, q) = list(map(int, input().strip().split()))
	rates = defaultdict(list)
	id2rate = [0] * n
	belongs = [0] * n
	for i in range(n):
		(a, b) = list(map(int, input().strip().split()))
		b -= 1
		rates[b].append((-a, i))
		belongs[i] = b
		id2rate[i] = a
	maxs = []
	for k in list(rates.keys()):
		heapq.heapify(rates[k])
		maxs.append((-rates[k][0][0], rates[k][0][1], k))
	heapq.heapify(maxs)
	for _ in range(q):
		(c, d) = list(map(int, input().strip().split()))
		c -= 1
		d -= 1
		pd = belongs[c]
		belongs[c] = d
		remove(rates[pd], belongs, maxs, pd)
		heapq.heappush(rates[d], (-id2rate[c], c))
		remove(rates[d], belongs, maxs, d)
		heapq.heappush(maxs, (-rates[d][0][0], rates[d][0][1], d))
		while maxs:
			if belongs[maxs[0][1]] != maxs[0][2] or rates[maxs[0][2]][0][1] != maxs[0][1]:
				heapq.heappop(maxs)
			else:
				print(maxs[0][0])
				break

def __starting_point():
	main()
__starting_point()


import sys
from heapq import heappush, heappop
read = sys.stdin.read
readline = sys.stdin.readline
readlines = sys.stdin.readlines
sys.setrecursionlimit(10 ** 9)
INF = 1 << 60
MOD = 1000000007

def main():
	(N, Q) = map(int, readline().split())
	M = 2 * 10 ** 5
	p = [[] for _ in range(M)]
	p_del = [[] for _ in range(M)]
	q = []
	q_del = []
	A = [0] * N
	B = [0] * N
	for i in range(N):
		(a, b) = map(int, readline().split())
		A[i] = a
		B[i] = b - 1
		heappush(p[b - 1], -a)
	for i in range(M):
		if p[i]:
			heappush(q, -p[i][0])
	CD = map(int, read().split())
	ans = [0] * Q
	for (i, (c, d)) in enumerate(zip(*[iter(CD)] * 2)):
		c -= 1
		d -= 1
		(b, B[c]) = (B[c], d)
		max_prev = set()
		max_prev.add(-p[b][0])
		if p[d]:
			max_prev.add(-p[d][0])
		heappush(p_del[b], -A[c])
		heappush(p[d], -A[c])
		while p_del[b] and p[b][0] == p_del[b][0]:
			heappop(p[b])
			heappop(p_del[b])
		max_current = set()
		max_current.add(-p[d][0])
		if p[b]:
			max_current.add(-p[b][0])
		for rating in max_prev - max_current:
			heappush(q_del, rating)
		for rating in max_current - max_prev:
			heappush(q, rating)
		while q_del and q[0] == q_del[0]:
			heappop(q)
			heappop(q_del)
		ans[i] = q[0]
	print(*ans, sep='\n')
	return

def __starting_point():
	main()
__starting_point()


from heapq import heappop, heappush
MAX = 2 * 10 ** 5
(n, q) = list(map(int, input().split()))
ab = []
k_in = [[] for _ in range(MAX)]
k_out = [[] for _ in range(MAX)]
for i in range(n):
	(a, b) = list(map(int, input().split()))
	b -= 1
	ab.append([a, b])
	heappush(k_in[b], -a)
k_max_in = []
k_max_out = []
for i in range(MAX):
	if (k := k_in[i]):
		heappush(k_max_in, -k[0])
for _ in range(q):
	(c, d) = [int(x) - 1 for x in input().split()]
	idx = ab[c][1]
	heappush(k_max_out, -k_in[idx][0])
	if k_in[d]:
		heappush(k_max_out, -k_in[d][0])
	while k_max_out and k_max_in[0] == k_max_out[0]:
		heappop(k_max_in)
		heappop(k_max_out)
	heappush(k_out[idx], -ab[c][0])
	while k_out[idx] and k_in[idx][0] == k_out[idx][0]:
		heappop(k_in[idx])
		heappop(k_out[idx])
	heappush(k_in[d], -ab[c][0])
	if k_in[idx]:
		heappush(k_max_in, -k_in[idx][0])
	heappush(k_max_in, -k_in[d][0])
	ab[c][1] = d
	print(k_max_in[0])


import heapq
(N, Q) = map(int, input().split())
ST = [0] * (N + 1)
kid_Add = [[] for _ in range(2 * 10 ** 5 + 1)]
kid_Del = [[] for _ in range(2 * 10 ** 5 + 1)]
max_Add = []
max_Del = []
heapq.heapify(kid_Add)
heapq.heapify(kid_Del)
heapq.heapify(max_Add)
heapq.heapify(max_Del)
for i in range(N):
	(A, B) = map(int, input().split())
	heapq.heappush(kid_Add[B], -1 * A)
	ST[i + 1] = (A, B)
for i in range(2 * 10 ** 5 + 1):
	if kid_Add[i]:
		heapq.heappush(max_Add, -1 * kid_Add[i][0])

def deleteHeap(x, y):
	while y and x[0] == y[0]:
		heapq.heappop(x)
		heapq.heappop(y)
for j in range(Q):
	(C, D) = map(int, input().split())
	(s, t) = ST[C]
	if not kid_Add[D]:
		Ne_S = 0
	else:
		Ne_S = kid_Add[D][0]
	Ol_S = kid_Add[t][0]
	heapq.heappush(kid_Add[D], -1 * s)
	heapq.heappush(kid_Del[t], -1 * s)
	deleteHeap(kid_Add[t], kid_Del[t])
	if Ne_S > -1 * s:
		heapq.heappush(max_Add, s)
		if Ne_S != 0:
			heapq.heappush(max_Del, -1 * Ne_S)
	if Ol_S == -1 * s:
		heapq.heappush(max_Del, s)
		if kid_Add[t]:
			heapq.heappush(max_Add, -1 * kid_Add[t][0])
	deleteHeap(max_Add, max_Del)
	print(max_Add[0])
	ST[C] = (s, D)


from collections import defaultdict
import heapq
import sys
input = sys.stdin.readline
(n, q) = list(map(int, input().split()))
ab = [list(map(int, input().split())) for _ in range(n)]
cd = [list(map(int, input().split())) for _ in range(q)]
m = 2 * 10 ** 5
thq = []
top = defaultdict(int)
topcnt = defaultdict(int)
rhq = [[] for _ in range(m + 1)]
rate = [defaultdict(int) for _ in range(m + 1)]
for (a, b) in ab:
	top[b] = max(top[b], a)
	rate[b][a] += 1
	heapq.heappush(rhq[b], -a)
for num in list(top.values()):
	heapq.heappush(thq, num)
	topcnt[num] += 1
for (c, d) in cd:
	(a, b) = ab[c - 1]
	ab[c - 1][1] = d
	rate[b][a] -= 1
	if rate[b][a] == 0:
		del rate[b][a]
	topcnt[top[b]] -= 1
	if topcnt[top[b]] == 0:
		del topcnt[top[b]]
	del top[b]
	if len(rate[b]) > 0:
		top[b] = -heapq.heappop(rhq[b])
		while top[b] not in rate[b]:
			top[b] = -heapq.heappop(rhq[b])
		heapq.heappush(rhq[b], -top[b])
		heapq.heappush(thq, top[b])
		topcnt[top[b]] += 1
	rate[d][a] += 1
	heapq.heappush(rhq[d], -a)
	if a > top[d]:
		if top[d] > 0:
			topcnt[top[d]] -= 1
			if topcnt[top[d]] == 0:
				del topcnt[top[d]]
		top[d] = a
		topcnt[top[d]] += 1
	heapq.heappush(thq, top[d])
	ans = heapq.heappop(thq)
	while ans not in topcnt:
		ans = heapq.heappop(thq)
	heapq.heappush(thq, ans)
	print(ans)


import sys
sysread = sys.stdin.readline
read = sys.stdin.read
sys.setrecursionlimit(10 ** 7)
from heapq import heappop, heappush

def binary_search(arr, operator='max'):
	_cri = {'max': max, 'min': min}
	ope = _cri[operator]
	dic = {0: arr}
	dep = 0
	while True:
		_arr = dic[dep]
		if len(_arr) == 1:
			break
		dic[dep + 1] = []
		for i in range(0, len(_arr), 2):
			if i == len(_arr) - 1:
				dic[dep + 1].append(_arr[i])
				continue
			dic[dep + 1].append(ope(_arr[i], _arr[i + 1]))
		dep += 1
	return _arr[0]

def eval_max(dic):
	tmp = binary_search(list(dic.keys()))
	return tmp

def run():
	(N, Q) = list(map(int, input().split()))
	rate = [0]
	child = [0]
	G = 2 * 10 ** 5
	group = [[] for _ in range(G + 1)]
	stocks = [[] for _ in range(G + 1)]
	for i in range(1, N + 1):
		(a, b) = list(map(int, sysread().split()))
		rate.append(a)
		child.append(b)
		heappush(group[b], -a)
	max_vals = []
	max_stocks = []
	for i in range(1, G + 1):
		if len(group[i]) > 0:
			heappush(max_vals, -group[i][0])
	for i in range(Q):
		(c, d) = list(map(int, sysread().split()))
		pre_g = child[c]
		heappush(max_stocks, -group[pre_g][0])
		heappush(stocks[pre_g], -rate[c])
		while group[pre_g] and stocks[pre_g]:
			if group[pre_g][0] == stocks[pre_g][0]:
				heappop(stocks[pre_g])
				heappop(group[pre_g])
			else:
				break
		if group[pre_g]:
			heappush(max_vals, -group[pre_g][0])
		if group[d]:
			heappush(max_stocks, -group[d][0])
		heappush(group[d], -rate[c])
		heappush(max_vals, -group[d][0])
		while max_vals and max_stocks:
			if max_vals[0] == max_stocks[0]:
				heappop(max_vals)
				heappop(max_stocks)
			else:
				break
		child[c] = d
		print(max_vals[0])

def __starting_point():
	run()
__starting_point()


import heapq

class DeletableHeap:

	def __init__(self, reversed=False, debug=False):
		self.heap = []
		self.removed = {}
		self.reversed = reversed
		self.factor = -1 if reversed else 1
		self.debug = debug

	def push(self, x):
		heapq.heappush(self.heap, x * self.factor)

	def pop(self):
		while self.heap:
			a = heapq.heappop(self.heap) * self.factor
			if a in self.removed and self.removed[a]:
				self.removed[a] -= 1
				if self.removed[a] == 0:
					del self.removed[a]
			else:
				return a

	def peek(self):
		while self.heap:
			a = self.heap[0] * self.factor
			if a in self.removed and self.removed[a]:
				self.removed[a] -= 1
				if self.removed[a] == 0:
					del self.removed[a]
				heapq.heappop(self.heap)
			else:
				return a

	def remove(self, x):
		if x not in self.removed:
			self.removed[x] = 0
		self.removed[x] += 1
(N, Q) = list(map(int, input().split()))
KG = [DeletableHeap(reversed=True) for _ in range(2 * 10 ** 5)]
B = []
A = []
for _ in range(N):
	(a, b) = list(map(int, input().split()))
	b -= 1
	KG[b].push(a)
	B.append(b)
	A.append(a)
rates = DeletableHeap(debug=False)
for kg in KG:
	if kg.peek() is not None:
		rates.push(kg.peek())
for _ in range(Q):
	(c, d) = list(map(int, input().split()))
	c -= 1
	d -= 1
	b = B[c]
	B[c] = d
	a = A[c]
	rates.remove(KG[b].peek())
	KG[b].remove(a)
	if KG[b].peek() is not None:
		rates.push(KG[b].peek())
	if KG[d].peek() is not None:
		rates.remove(KG[d].peek())
	KG[d].push(a)
	rates.push(KG[d].peek())
	print(rates.peek())


import sys
from heapq import heappush, heappop
read = sys.stdin.read
readline = sys.stdin.readline
readlines = sys.stdin.readlines
sys.setrecursionlimit(10 ** 9)
INF = 1 << 60
MOD = 1000000007

def main():
	(N, Q) = map(int, readline().split())
	M = 2 * 10 ** 5
	hq1 = [[] for _ in range(M)]
	hq2 = [[] for _ in range(M)]
	hq_ans1 = []
	hq_ans2 = []
	A = [0] * N
	B = [0] * N
	for i in range(N):
		(a, b) = map(int, readline().split())
		A[i] = a
		B[i] = b - 1
		heappush(hq1[b - 1], -a)
	for i in range(M):
		if hq1[i]:
			heappush(hq_ans1, -hq1[i][0])
	CD = map(int, read().split())
	ans = [0] * Q
	for (i, (c, d)) in enumerate(zip(*[iter(CD)] * 2)):
		c -= 1
		d -= 1
		b = B[c]
		B[c] = d
		max_from_prev = -hq1[b][0]
		if hq1[d]:
			max_to_prev = -hq1[d][0]
		else:
			max_to_prev = None
		heappush(hq2[b], -A[c])
		heappush(hq1[d], -A[c])
		while hq2[b] and hq1[b][0] == hq2[b][0]:
			heappop(hq1[b])
			heappop(hq2[b])
		if hq1[b]:
			max_from = -hq1[b][0]
		else:
			max_from = None
		max_to = -hq1[d][0]
		if max_from_prev != max_from:
			heappush(hq_ans2, max_from_prev)
			if max_from:
				heappush(hq_ans1, max_from)
		if max_to_prev != max_to:
			if max_to_prev:
				heappush(hq_ans2, max_to_prev)
			heappush(hq_ans1, max_to)
		while hq_ans2 and hq_ans1[0] == hq_ans2[0]:
			heappop(hq_ans1)
			heappop(hq_ans2)
		ans[i] = hq_ans1[0]
	print(*ans, sep='\n')
	return

def __starting_point():
	main()
__starting_point()


import heapq
(N, Q) = list(map(int, input().rstrip().split()))
AB_list = [list(map(int, input().rstrip().split())) for i in range(N)]
CD_list = [list(map(int, input().rstrip().split())) for i in range(Q)]
K = [[] for _ in range(2 * 10 ** 5)]
K_deleted = [[] for _ in range(2 * 10 ** 5)]
max_K = []
max_K_deleted = []
for (a, b) in AB_list:
	heapq.heappush(K[b - 1], -a)
for member in K:
	if member:
		heapq.heappush(max_K, -member[0])
for (c, d) in CD_list:
	c_rate = AB_list[c - 1][0]
	c_prev = AB_list[c - 1][1]
	departure_prev_max = K[c_prev - 1][0]
	if K[d - 1]:
		destination_prev_max = K[d - 1][0]
	else:
		destination_prev_max = None
	heapq.heappush(K_deleted[c_prev - 1], -c_rate)
	AB_list[c - 1][1] = d
	heapq.heappush(K[d - 1], -c_rate)
	for i in [c_prev, d]:
		while K_deleted[i - 1] and K[i - 1][0] == K_deleted[i - 1][0]:
			heapq.heappop(K[i - 1])
			heapq.heappop(K_deleted[i - 1])
	if not K[c_prev - 1]:
		heapq.heappush(max_K_deleted, -departure_prev_max)
	elif departure_prev_max != K[c_prev - 1][0]:
		heapq.heappush(max_K_deleted, -departure_prev_max)
		heapq.heappush(max_K, -K[c_prev - 1][0])
	if destination_prev_max != K[d - 1][0]:
		if destination_prev_max:
			heapq.heappush(max_K_deleted, -destination_prev_max)
		heapq.heappush(max_K, -K[d - 1][0])
	while max_K_deleted and max_K[0] == max_K_deleted[0]:
		heapq.heappop(max_K)
		heapq.heappop(max_K_deleted)
	print(max_K[0])


import sys

def input():
	return sys.stdin.readline().strip()
from collections import defaultdict
from heapq import heappop, heappush, heapify

def main():
	(N, Q) = map(int, input().split())
	infant_info = [tuple(map(int, input().split())) for _ in range(N)]
	queries = [tuple(map(int, input().split())) for _ in range(Q)]
	num_kd = 2 * 10 ** 5
	nums = [0] * num_kd
	h = [[] for _ in range(num_kd)]
	pos = [-1] * N
	kd_max = defaultdict(int)
	min_max_timestamp = [0] * num_kd
	for (i, (a, b)) in enumerate(infant_info):
		b -= 1
		heappush(h[b], (-a, i))
		pos[i] = b
		nums[b] += 1
		kd_max[b] = max(kd_max[b], a)
	min_max_h = [(val, kd, 0) for (kd, val) in kd_max.items()]
	heapify(min_max_h)
	for (t, (c, to_kd)) in enumerate(queries, 1):
		c -= 1
		to_kd -= 1
		from_kd = pos[c]
		pos[c] = to_kd
		nums[from_kd] -= 1
		if nums[from_kd] > 0:
			while True:
				(rate, infant) = heappop(h[from_kd])
				if pos[infant] == from_kd:
					heappush(h[from_kd], (rate, infant))
					heappush(min_max_h, (-rate, from_kd, t))
					break
		min_max_timestamp[from_kd] = t
		nums[to_kd] += 1
		(rate_c, _) = infant_info[c]
		heappush(h[to_kd], (-rate_c, c))
		while True:
			(rate, infant) = heappop(h[to_kd])
			if pos[infant] == to_kd:
				heappush(h[to_kd], (rate, infant))
				heappush(min_max_h, (-rate, to_kd, t))
				break
		min_max_timestamp[to_kd] = t
		while True:
			(rate, kd, ts) = heappop(min_max_h)
			if min_max_timestamp[kd] == ts:
				print(rate)
				heappush(min_max_h, (rate, kd, ts))
				break

def __starting_point():
	main()
__starting_point()


from heapq import *
import sys
input = sys.stdin.readline

def main():
	(n, q) = list(map(int, input().split()))
	children = [[int(x) for x in input().split()] for _ in range(n)]
	m = int(2 * 100000.0)
	heap_each = [[] for _ in range(m)]
	each_moved = [dict() for _ in range(m)]
	heap_all = []
	all_moved = dict()
	for i in range(n):
		(a, b) = children[i]
		heappush(heap_each[b - 1], -a)
	for i in range(m):
		if heap_each[i]:
			heappush(heap_all, -heap_each[i][0])
	ans = []
	for i in range(q):
		(c, d) = list(map(int, input().split()))
		(a, b) = children[c - 1]
		if a == -heap_each[b - 1][0]:
			if a in all_moved:
				all_moved[a] += 1
			else:
				all_moved[a] = 1
			heappop(heap_each[b - 1])
			while heap_each[b - 1]:
				if heap_each[b - 1][0] in each_moved[b - 1] and each_moved[b - 1][heap_each[b - 1][0]] > 0:
					each_moved[b - 1][heap_each[b - 1][0]] -= 1
					heappop(heap_each[b - 1])
					continue
				heappush(heap_all, -heap_each[b - 1][0])
				break
		elif -a in each_moved[b - 1]:
			each_moved[b - 1][-a] += 1
		else:
			each_moved[b - 1][-a] = 1
		if not heap_each[d - 1]:
			heappush(heap_each[d - 1], -a)
			heappush(heap_all, a)
		elif -a < heap_each[d - 1][0]:
			if -heap_each[d - 1][0] in all_moved:
				all_moved[-heap_each[d - 1][0]] += 1
			else:
				all_moved[-heap_each[d - 1][0]] = 1
			heappush(heap_each[d - 1], -a)
			heappush(heap_all, a)
		else:
			heappush(heap_each[d - 1], -a)
		while heap_all:
			if heap_all[0] in all_moved and all_moved[heap_all[0]] > 0:
				all_moved[heap_all[0]] -= 1
				heappop(heap_all)
				continue
			break
		children[c - 1][1] = d
		ans.append(heap_all[0])
	for answer in ans:
		print(answer)

def __starting_point():
	main()
__starting_point()


import sys
from heapq import heappop, heappush, heapify
sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
mod = 10 ** 9 + 7
MAX = 2 * 10 ** 5 + 1

def resolve():

	def max_rate_in_cls(c):
		q = class_rate[c]
		while q:
			(x, enj) = q[0]
			if enji_cls[enj] == c:
				return -x
			else:
				heappop(q)
		return 0

	def get_ans():
		q = max_rate
		while True:
			(x, c) = q[0]
			if max_rate_in_cls(c) == x:
				return x
			heappop(q)

	def max_rate_in_cls(c):
		q = class_rate[c]
		while q:
			(x, enj) = q[0]
			if enji_cls[enj] == c:
				return -x
			else:
				heappop(q)
		return 0
	(n, q) = list(map(int, input().split()))
	enji_rate = [0] * (n + 1)
	enji_cls = [0] * (n + 1)
	class_rate = [[] for _ in range(MAX)]
	for i in range(1, n + 1):
		(rate, cls) = list(map(int, input().split()))
		enji_rate[i] = rate
		enji_cls[i] = cls
		heappush(class_rate[cls], (-rate, i))
	max_rate = []
	for c in range(MAX):
		x = max_rate_in_cls(c)
		if x:
			max_rate.append((x, c))
	heapify(max_rate)
	for _ in range(q):
		(enj, after_cls) = list(map(int, input().split()))
		before_cls = enji_cls[enj]
		heappush(class_rate[after_cls], (-enji_rate[enj], enj))
		enji_cls[enj] = after_cls
		for c in (before_cls, after_cls):
			x = max_rate_in_cls(c)
			if x != 0:
				heappush(max_rate, (x, c))
		print(get_ans())

def __starting_point():
	resolve()
__starting_point()


import heapq
import sys

def input():
	return sys.stdin.readline().rstrip()

def main():
	(n, q) = map(int, input().split())
	syozoku = [0] * (n + 1)
	rate = [0] * (n + 1)
	enrate = [0] * (2 * 10 ** 5 + 1)
	saikyourate = HeapDict()
	for i in range(1, 2 * 10 ** 5 + 1):
		enrate[i] = HeapDict()
	for i in range(1, n + 1):
		(a, b) = map(int, input().split())
		syozoku[i] = b
		rate[i] = a
		enrate[b].insert(-a)
	for i in range(1, 2 * 10 ** 5 + 1):
		if len(enrate[i].h) != 0:
			saikyourate.insert(-enrate[i].get_min())
	for _ in range(q):
		(c, d) = map(int, input().split())
		saikyourate.erase(-enrate[syozoku[c]].get_min())
		enrate[syozoku[c]].erase(-rate[c])
		if len(enrate[syozoku[c]].h) != 0:
			saikyourate.insert(-enrate[syozoku[c]].get_min())
		if len(enrate[d].h) != 0:
			saikyourate.erase(-enrate[d].get_min())
		enrate[d].insert(-rate[c])
		saikyourate.insert(-enrate[d].get_min())
		syozoku[c] = d
		print(saikyourate.get_min())

class HeapDict:

	def __init__(self):
		self.h = []
		self.d = dict()

	def insert(self, x):
		heapq.heappush(self.h, x)
		if x not in self.d:
			self.d[x] = 1
		else:
			self.d[x] += 1

	def erase(self, x):
		if x not in self.d or self.d[x] == 0:
			print(x, 'is not in HeapDict')
			return
		else:
			self.d[x] -= 1
		while len(self.h) != 0:
			if self.d[self.h[0]] == 0:
				heapq.heappop(self.h)
			else:
				break

	def is_exist(self, x):
		if x in self.d and self.d[x] != 0:
			return True
		else:
			return False

	def get_min(self):
		return self.h[0]

def __starting_point():
	main()
__starting_point()


import heapq

class BalancingTree:

	def __init__(self):
		self.p = []
		self.q = []

	def insert(self, x):
		heapq.heappush(self.p, x)

	def erase(self, x):
		heapq.heappush(self.q, x)

	def minimum(self):
		while self.q and self.p[0] == self.q[0]:
			heapq.heappop(self.p)
			heapq.heappop(self.q)
		return self.p[0] if self.p else None
MAX = 2 * 10 ** 5
(n, q) = list(map(int, input().split()))
ab = []
k = [BalancingTree() for _ in range(MAX)]
for i in range(n):
	(a, b) = list(map(int, input().split()))
	b -= 1
	ab.append([a, b])
	k[b].insert(-a)
k_max = BalancingTree()
for i in range(MAX):
	if (v := k[i].minimum()):
		k_max.insert(-v)
for _ in range(q):
	(c, d) = [int(x) - 1 for x in input().split()]
	(a, b) = ab[c]
	k_max.erase(-k[b].minimum())
	if (v := k[d].minimum()):
		k_max.erase(-v)
	k[b].erase(-a)
	k[d].insert(-a)
	if (v := k[b].minimum()):
		k_max.insert(-v)
	k_max.insert(-k[d].minimum())
	ab[c][1] = d
	print(k_max.minimum())


import heapq
(N, Q) = map(int, input().split())
M = 2 * 10 ** 5
rate_list = []
rates = [[] for _ in range(M)]
members = [set() for _ in range(M)]
belongs = [-1] * N
for i in range(N):
	(A, B) = map(int, input().split())
	B = B - 1
	heapq.heappush(rates[B], (-A, i))
	members[B].add(i)
	belongs[i] = B
	rate_list.append(A)
max_rates = []
for (num, rate) in enumerate(rates):
	if len(rate) > 0:
		heapq.heappush(max_rates, (-rate[0][0], num))
for i in range(Q):
	(C, D) = map(int, input().split())
	C = C - 1
	D = D - 1
	old = belongs[C]
	belongs[C] = D
	members[old].remove(C)
	members[D].add(C)
	while len(rates[old]) > 0 and rates[old][0][1] not in members[old]:
		heapq.heappop(rates[old])
	if len(rates[old]) > 0:
		heapq.heappush(max_rates, (-rates[old][0][0], old))
	heapq.heappush(rates[D], (-rate_list[C], C))
	heapq.heappush(max_rates, (rate_list[C], D))
	while max_rates:
		(rate, num) = max_rates[0]
		if len(rates[num]) == 0 or -rates[num][0][0] != rate:
			heapq.heappop(max_rates)
		else:
			print(rate)
			break


from heapq import heappop, heappush
(N, Q) = list(map(int, input().split()))
M = 2 * 10 ** 5
belong = [None] * N
rate = [None] * N
kdgt = [[] for _ in range(M)]
for c in range(N):
	(A, B) = list(map(int, input().split()))
	B -= 1
	belong[c] = B
	rate[c] = A
	heappush(kdgt[B], (-A, c))
q = []
for i in range(M):
	if kdgt[i]:
		(A, c) = kdgt[i][0]
		heappush(q, (-A, c, i))
for _ in range(Q):
	(C, D) = list(map(int, input().split()))
	C -= 1
	D -= 1
	pd = belong[C]
	belong[C] = D
	while kdgt[pd]:
		(A, c) = kdgt[pd][0]
		if belong[c] != pd:
			heappop(kdgt[pd])
		else:
			heappush(q, (-A, c, pd))
			break
	heappush(kdgt[D], (-rate[C], C))
	while kdgt[D]:
		(A, c) = kdgt[D][0]
		if belong[c] != D:
			heappop(kdgt[D])
		else:
			heappush(q, (-A, c, D))
			break
	while q:
		(A, c, d) = q[0]
		if belong[c] != d or kdgt[d][0][1] != c:
			heappop(q)
		else:
			print(A)
			break


from heapq import heappush, heappop
(n, q) = map(int, input().split())
rate = [0] * n
belong = [-1] * n
yochien_rates = [[] for i in range(2 * 10 ** 5 + 10)]
delete_yochien_rates = [[] for i in range(2 * 10 ** 5 + 10)]
yochiens = set()
for i in range(n):
	(a, b) = map(int, input().split())
	b -= 1
	rate[i] = a
	belong[i] = b
	yochiens.add(b)
	heappush(yochien_rates[b], -a)
maxs = []
delete_maxs = []
for i in yochiens:
	heappush(maxs, -yochien_rates[i][0])
ans = []
for _ in range(q):
	(c, d) = map(int, input().split())
	c -= 1
	d -= 1
	old = belong[c]
	belong[c] = d
	heappush(delete_maxs, -yochien_rates[old][0])
	if yochien_rates[d]:
		heappush(delete_maxs, -yochien_rates[d][0])
	heappush(yochien_rates[d], -rate[c])
	heappush(maxs, -yochien_rates[d][0])
	heappush(delete_yochien_rates[old], -rate[c])
	while delete_yochien_rates[old] and yochien_rates[old][0] == delete_yochien_rates[old][0]:
		heappop(yochien_rates[old])
		heappop(delete_yochien_rates[old])
	if yochien_rates[old]:
		heappush(maxs, -yochien_rates[old][0])
	while delete_maxs and maxs[0] == delete_maxs[0]:
		heappop(maxs)
		heappop(delete_maxs)
	ans.append(maxs[0])
print(*ans, sep='\n')


from heapq import *
(n, q) = map(int, input().split())
kg = [[] for _ in range(2 * 10 ** 5)]
pos = [0] * n
rate = [0] * n
for i in range(n):
	(a, b) = map(int, input().split())
	b -= 1
	heappush(kg[b], (-a, i))
	pos[i] = b
	rate[i] = a
evenness = []
for i in range(2 * 10 ** 5):
	if kg[i]:
		(a, c) = kg[i][0]
		heappush(evenness, (-a, c))
for _ in range(q):
	(c, d) = map(int, input().split())
	(c, d) = (c - 1, d - 1)
	prev = pos[c]
	pos[c] = d
	heappush(kg[d], (-rate[c], c))
	while kg[prev] and pos[kg[prev][0][1]] != prev:
		heappop(kg[prev])
	while kg[d] and pos[kg[d][0][1]] != d:
		heappop(kg[d])
	if kg[prev]:
		(a, c) = kg[prev][0]
		heappush(evenness, (-a, c))
	if kg[d]:
		(a, c) = kg[d][0]
		heappush(evenness, (-a, c))
	while evenness and kg[pos[evenness[0][1]]][0][1] != evenness[0][1]:
		heappop(evenness)
	print(evenness[0][0])


from collections import defaultdict
import heapq
(n, q) = map(int, input().split())
kindergarten = defaultdict(lambda : [])
best = []
(A, B) = ([], [])
for i in range(n):
	(a, b) = map(int, input().split())
	A.append(a)
	B.append(b)
	heapq.heappush(kindergarten[b], (-a, i))
for i in kindergarten:
	tmp = kindergarten[i][0]
	heapq.heappush(best, (-tmp[0], tmp[1]))
for i in range(q):
	(c, d) = map(int, input().split())
	kd_ori = B[c - 1]
	B[c - 1] = d
	while kindergarten[kd_ori]:
		x = kindergarten[kd_ori][0]
		if B[x[1]] != kd_ori:
			heapq.heappop(kindergarten[kd_ori])
			continue
		heapq.heappush(best, (-x[0], x[1]))
		break
	heapq.heappush(kindergarten[d], (-A[c - 1], c - 1))
	while kindergarten[d]:
		tmp = kindergarten[d][0]
		heapq.heappush(best, (-tmp[0], tmp[1]))
		break
	while best:
		tmp = best[0]
		tmp2 = kindergarten[B[tmp[1]]][0]
		if -tmp2[0] != tmp[0]:
			heapq.heappop(best)
			continue
		print(tmp[0])
		break
	print()


import heapq
(N, Q) = list(map(int, input().split()))
A = [0 for i in range(N)]
B = [0 for i in range(N)]
C = [0 for i in range(Q)]
D = [0 for i in range(Q)]
for i in range(N):
	(A[i], B[i]) = list(map(int, input().split()))
	B[i] -= 1
for i in range(Q):
	(C[i], D[i]) = list(map(int, input().split()))
	C[i] -= 1
	D[i] -= 1
nowbelongs = [B[i] for i in range(N)]
maxrate = []
kindergarden = [[] for i in range(2 * 10 ** 5)]
for i in range(N):
	heapq.heappush(kindergarden[B[i]], (-A[i], i))

def saikyo_enji(k):
	while kindergarden[k]:
		(minusrate, index) = kindergarden[k][0]
		if nowbelongs[index] == k:
			return index
		else:
			heapq.heappop(kindergarden[k])
	return -1
for k in range(2 * 10 ** 5):
	i = saikyo_enji(k)
	if i != -1:
		heapq.heappush(maxrate, (A[i], i))
for j in range(Q):
	i = C[j]
	oldbelongs = nowbelongs[i]
	nowbelongs[i] = -1
	if saikyo_enji(oldbelongs) != -1:
		heapq.heappush(maxrate, (A[saikyo_enji(oldbelongs)], saikyo_enji(oldbelongs)))
	heapq.heappush(kindergarden[D[j]], (-A[C[j]], C[j]))
	nowbelongs[C[j]] = D[j]
	heapq.heappush(maxrate, (A[saikyo_enji(D[j])], saikyo_enji(D[j])))
	while maxrate:
		(rate, index) = maxrate[0]
		if saikyo_enji(nowbelongs[index]) == index:
			print(rate)
			break
		else:
			heapq.heappop(maxrate)