In africa jungle , there were zebra's who liked to spit.
There owner watched them for whole day and noted in his sheet where each zebra spitted.
Now he's in a confusion and wants to know if in the jungle there are two zebra's which spitted at each other.
Help him solve this task.
If the zebra is present in position a spits b metres right , he can hit only zebra in position a+b , if such a zebra exists.

-----Input:-----
- The first line contains integer t(1<=t<100)- amount of zebras in jungle.
- Each of following t lines contains two integers a(i) and b(i)(-10^4<=x(i)<=10^4,1<|d(i)|<=2.10^4) - records in owner sheet.
- a(i) is the position of i-th zebra and b(i) is distance at which the i-th camel spitted.
Positive values of d(i) correspond to spits right, negative values correspond to spit left.No two zebras may stand in the same position.

-----Output:-----
If there are two zebras , which spitted at each other , output YES, otherwise , output NO.

-----Sample Input:-----
2
0 1
1 -1

-----Sample Output:-----
YES

Starter code:

Solutions:
# cook your dish here
t=int(input())
i=0
a=0
d=dict()
while i<t:
    l=input().split()
    d[int(l[0])]=int(l[0])+int(l[1])
    i+=1
for k in d:
    if d[k] in d:
        if d[d[k]]==k:
            a=1
            break
if a==1:
    print("YES")
else:
    print("NO")

# cook your dish here
t=int(input())
i=0
a=0
d=dict()
while i<t:
    l=input().split()
    d[int(l[0])]=int(l[0])+int(l[1])
    i+=1
for k in d:
    if d[k] in d:
        if d[d[k]]==k:
            a=1
            break
if a==1:
    print("YES")
else:
    print("NO")

s1,s2=[],[]
flag=0
for _ in range(int(input())):
    x,y=[int(x) for x in input().split()]
    s1.append(x)
    s2.append(x+y)
for _ in range(len(s1)):
    for __ in range(len(s2)):
        if _!=__ and s1[__]==s2[_] and s1[_]==s2[__]:
            flag=1
            print('YES')
            break
    if flag==1:
        break
if flag==0:
    print('NO')


# cook your dish here
t=int(input())
a=list()
for _ in range(t):
    a.append(list(map(int,input().split())))
count=0
for i in range(t):
    for j in range(i+1,t):
        if a[i][1]+a[j][1]==0:
            count+=1
            print('YES')
            break
    if count!=0:
        break
if count==0:
    print("NO")

t=int(input())
lst1=[]
lst=[]
for i in range(t):

    a,b=list(map(int,input().split()))
    lst.append((a,b))
#print(lst)
for i in range(0,t):
    temp=lst[i][0]+lst[i][1]
    #print(temp)
    for j in lst:
        #print("ds",j)
        if j!=lst[i] and j[0]==temp:
            temp1= j[0]+j[1]
            if temp1==lst[i][0]:
                lst1.append(1)
                break
            break
if len(lst1)==0:
    print("NO")
else:
    print("YES")


# cook your dish here
n=int(input())
a=[]
for i in range(n):
    x,y=map(int,input().split())
    a.append([x,x+y])
ans=False    
for i in range(n):
    for j in range(n):
        if(i==j): continue
        if(a[i][1]==a[j][0] and a[i][0]==a[j][1]):
            ans=True;break
if(ans):print("YES")
else:print("NO")

n=int(input())
a=list()
for i in range(n):
    a.append(list(map(int,input().split())))
c=0
for i in range(n):
    for j in range(i+1,n):
        if a[i][1]+a[j][1]==0:
            c+=1
            print('YES')
            break
    if c!=0:
        break
if c==0:
    print("NO")

n=int(input())
a=list()
for i in range(n):
    a.append(list(map(int,input().split())))
c=0
for i in range(n):
    for j in range(i+1,n):
        if a[i][1]+a[j][1]==0:
            c+=1
            print('YES')
            break
    if c!=0:
        break
if c==0:
    print("NO")

n=int(input())
a=list()
for i in range(n):
    a.append(list(map(int,input().split())))
c=0
for i in range(n):
    for j in range(i+1,n):
        if a[i][1]+a[j][1]==0:
            c+=1
            print('YES')
            break
    if c!=0:
        break
if c==0:
    print("NO")

# cook your dish here
try:
    t=int(input())
    a=[]
    b=[]
    for i in range(t):
        x,y=map(int,input().split())
        a.append(x)
        b.append(y)
    flag=0
    for i in range(len(a)-1):
        for j in range(i+1,len(a)):
            a1=a[i]
            b1=b[i]
            a2=a[j]
            b2=b[j]
            if a1+b1==a2 and a2+b2==a1:
                flag=1
    if flag==1:
        print("YES")
    else:
        print("NO")
except Exception:
    pass

n=int(input())
a=list()
for i in range(n):
    a.append(list(map(int,input().split())))
c=0
for i in range(n):
    for j in range(i+1,n):
        if a[i][1]+a[j][1]==0:
            c+=1
            
if c==0:
    print("NO")
else:
    print("YES")

no_zeb = int(input())
lst = []
for _ in range(no_zeb):
    position, dist = (list(map(int, input().split())))
    lst.append((position, dist))
for j in lst:
    spit_i = j[0] + j[1]
    for l in lst:
        if l[0] == spit_i and l[0] + l[1] == j[0]:
            print('YES')
            return
print('NO')


# cook your dish here
n=int(input())
s=set()
for i in range(n):
	x,d =map(int,input().split())
	if (x+d,-d) in s:
		print('YES')
		return
	s.add((x, d))
print('NO')

# cook your dish here
n=int(input())
s=set()
for i in range(n):
	x,d =map(int,input().split())
	if (x+d,-d) in s:
		print('YES')
		return
	s.add((x, d))
print('NO')

a=[]
b=[]
c=0
for _ in range(int(input())):
    x,y=list(map(int,input().split()))
    z=x+y
    a.append(z)
    b.append(x)
for i in range(len(a)):
    z=a[i]
    z1=b[i]
    for j in range(len(a)):
        if j!=i:
            z2=a[j]
            z3=b[j]
            if z==z3 and z1==z2:
                c=1
                break
if c==1:
    print('YES')
else:
    print('NO')
  


n = int(input())
a = []
f = 0
for i in range(n):
    a.append(list(map(int,input().split())))
for i in range(len(a)):
    for j in range(len(a)):
        if i == j:
            continue
        if i == a[-1]:
            break
        if sum(a[i]) == a[j][0] and sum(a[j]) == a[i][0]:
            f = 1
            break
if f:
    print("YES")
else:
    print("NO")

t = int(input())
lst = []
lst2 = []
stat = False
for x in range(t):
    lst.append(list(map(int,input().split())))
for j in range(len(lst)):
    for i in range(len(lst)):
        if i == j:
            continue
        if j == lst[-1]:
            break
        if sum(lst[j])==lst[i][0] and sum(lst[i])==lst[j][0]:
            stat = True
            break
if stat:
    print("YES")
else:
    print("NO")
     
     


# cook your dish here
def check(a,b):
    
    for i in range(t):
        if a[i]+b[i] in a:
            idx = a.index(a[i]+b[i])
            if a[idx]+b[idx]==a[i]:
                print('YES')
                return
    
    print('NO')

t = int(input())
a = []
b = []
for _ in range(t):
    x, y = map(int, input().split())
    a.append(x)
    b.append(y)

check(a,b) 

n=int(input())
A=[]
B=[]
spit=False
for i in range(n):
    a,b=map(int,input().split())
    A.append(a)
    B.append(b)
for j in range(n):
    for k in range(j,n):
        if B[j]==A[k] and (B[k]+A[k]==A[j]):
            spit=True
            break
        elif (B[k]+A[k]==A[j]) and (B[j]+A[j]==A[k]):
            spit=True
            break
    if spit:
        break
if spit:
    print("YES")
else:
    print("NO")

# cook your dish here
from collections import deque, defaultdict
from math import sqrt, ceil
import sys
import copy
def get_array(): return list(map(int, sys.stdin.readline().strip().split()))
def get_ints(): return list(map(int, sys.stdin.readline().strip().split()))
def input(): return sys.stdin.readline().strip()

n=int(input())

d=dict()
flag=0
for i in range(n):
    x,y=get_ints()
    d[x]=y

for x  in list(d.keys()):
    res=x+d[x]
    if res in list(d.keys()):
        if res+d[res]==x:
            flag=1
            break

if flag==1:
    print("YES")
else:
    print("NO")



l = []
for _ in range(int(input())):
    a, b = list(map(int, input().split()))
    l.append((a, b))

for i in l:
    for j in l:
        if i[0] + i[1] == j[0] and j[0] + j[1] == i[0]:
            print("YES")
            return
print("NO")


def fun(t):
    s=[]
    a=[]
    b=[]
    for _ in range(t):
        x,y=list(map(int,input().split()))
        s.append(x+y)
        a.append(x)
        b.append(y)
    
    for i in range(t):
        if(s[i] in a):
            yy=a.index(s[i])
            xx=a[yy]+b[yy]
            if(xx==a[i]):
                return "YES"
    return "NO"
        
t=int(input())
print(fun(t))
    
    


# cook your dish here
try:
    t=int(input())
    l=[]
    flag=0
    for k in range(0,t):
        n,m=(int(i) for i in input().split(" "))
        l.append([n,m])
    for i in range(0,t):
        s=l[i][0]+l[i][1]
        for j in range(i+1,t):
            if(s==l[j][0] and l[i][0]==(l[j][0]+l[j][1])):
                flag=1
                print("YES")
                break
    if(flag==0):
        print("NO")
            
except:
    pass

# cook your dish here
T=int(input())
mat=[]
for _ in range(T):
    a=list(map(int,input().split()))
    mat.append(a)
f=0
for i in range(T):
    ch=mat[i][0]+mat[i][1]
    for j in range(T):
        if ch==mat[j][0] and mat[i][0]==mat[j][0]+mat[j][1]:
            f=1
            break
if f:
    print('YES')
else:
    print('NO')

a=[]
b=[]
n=int(input())
for i in range(n):
    c,d=list(map(int,input().split()))
    a.append(c)
    b.append(c+d)
spit=0  

for j in range(0,len(a)):
    for k in range(0,len(b)):
        if a[j]==b[k] and a[k]==b[j]:
            spit=spit+1 
            break

if spit>0:
    print("YES")
else:
    print("NO")