Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())

A = [list(map(int, input().split())) for _ in range(N)]

cnt = [0] * N

S = []
for i in range(N):
  t = A[i][cnt[i]] - 1
  if i == A[t][cnt[t]] - 1:
    if cnt[i] != N - 2:
      S.append(i)

ans = 1
while S:
  ans += 1
  L = [True] * N
  for i in S:
    cnt[i] += 1
  T = []
  for i in S:
    if L[i]:
      t = A[i][cnt[i]] - 1
      if i == A[t][cnt[t]] - 1:
        if cnt[i] != N - 2:
          L[i] = False
          T.append(i)
        if L[t]:
          L[t] = False
          if cnt[t] != N - 2:
            T.append(t)
  S = T

for i in range(N):
  if cnt[i] != N - 2:
    print(-1)
    break
else:
  print(ans)


Fixed submission:
N = int(input())
A = [list(map(int, input().split())) for _ in range(N)]    

cnt = [0] * N

S = []
for i in range(N):
  t = A[i][cnt[i]] - 1
  if i == A[t][cnt[t]] - 1:
    if cnt[i] != N - 2:
      S.append(i)

ans = 1
L = [True] * N
while S:
  ans += 1
  for i in S:
    cnt[i] += 1
    L[i] = True
  T = []
  for i in S:
    if L[i]:
      t = A[i][cnt[i]] - 1
      if i == A[t][cnt[t]] - 1:
        if cnt[i] != N - 2:
          L[i] = False
          T.append(i)
        if L[t]:
          L[t] = False
          if cnt[t] != N - 2:
            T.append(t)
  S = T

for i in range(N):
  if cnt[i] != N - 2:
    print(-1)
    break
else:
  print(ans)
Buggy python submission (verdict: Runtime Error):
import math
S = int(input())

t = math.floor(math.sqrt(S))
if t * (t + 1) < S:
  x1 = t + 1
  y2 = t + 1
else:
  x1 = t
  x2 = t + 1
x2 = 1
y1 = x1 * y2 - S

print(0, 0, x1, y1, x2, y2)



Fixed submission:
import math
S = int(input())

if S == 10 ** 18:
  print(0, 0, 0, 10 ** 9, 10 ** 9, 0)
  exit()

t = math.floor(math.sqrt(S))
if t * (t + 1) < S:
  x1 = t + 1
  y2 = t + 1
else:
  x1 = t
  y2 = t + 1
x2 = 1
y1 = x1 * y2 - S

print(0, 0, x1, y1, x2, y2)

Buggy python submission (verdict: Runtime Error):
import math
S = int(input())

t = math.floor(math.sqrt(S))
if t * t + 1 < S:
  x1 = t + 1
  y2 = t + 1
else:
  x1 = t
  x2 = t + 1
x2 = 1
y1 = x1 * y2 - S

print(0, 0, x1, y1, x2, y2)



Fixed submission:
import math
S = int(input())

if S == 10 ** 18:
  print(0, 0, 0, 10 ** 9, 10 ** 9, 0)
  exit()

t = math.floor(math.sqrt(S))
if t * (t + 1) < S:
  x1 = t + 1
  y2 = t + 1
else:
  x1 = t
  y2 = t + 1
x2 = 1
y1 = x1 * y2 - S

print(0, 0, x1, y1, x2, y2)
Buggy python submission (verdict: Time Limit Exceeded):
import queue

N, M = list(map(int, input().split()))
uv = [list(map(int, input().split())) for _ in range(M)]
S, T = list(map(int, input().split()))

V = [[0, 0, 0] for _ in range(N + 1)]
R = {}

for u, v in uv:
  if u not in R:
    R[u] = [v]
  else:
    R[u].append(v)
q = queue.Queue()
put = q.put
get = q.get

put([S, 0, 2])
ans = -1
while not q.empty():
  t = get()
  if t[0] == T and t[2] == 2:
    ans = t[1]
    break
  k = (t[2] + 1) % 3
  m = t[1]
  if t[2] == 2:
    m += 1
  if t[0] not in R: continue
  for i in R[t[0]]:
    if V[i][k] == 0:
      V[i][k] = 1
      put([i, m, k])

print(ans)

Fixed submission:
import queue

N, M = list(map(int, input().split()))
uv = [list(map(int, input().split())) for _ in range(M)]
S, T = list(map(int, input().split()))

V = [[0, 0, 0] for _ in range(N + 1)]
R = {}

for u, v in uv:
  if u not in R:
    R[u] = [v]
  else:
    R[u].append(v)
q = queue.Queue()
put = q.put
get = q.get

put([S, 0, 2])
ans = -1
while not q.empty():
  t = get()
  if t[0] == T and t[2] == 2:
    ans = t[1]
    break
  k = (t[2] + 1) % 3
  m = t[1]
  if t[2] == 2:
    m += 1
  if t[0] not in R: continue
  for i in R[t[0]]:
    if V[i][k] == 0:
      V[i][k] = 1
      put([i, m, k])

print(ans)
Buggy python submission (verdict: Runtime Error):
def hersCode(l, r, n, N):
  ok = l
  ng = r + 1
  while abs(ok - ng) > 1:
    mid = abs(ok + ng) // 2
    if mid * n <= N:
      ok = mid
    else:
      ng = mid
  return ng


N, K = list(map(int, input().split()))
MOD = 10 ** 9 + 7

L = []
t = 1
n = N
while t < N:
  L.append(t)
  t = hersCode(t, N, N // t ,N)

D = [0] * len(L)
L.append(N + 1)
for i in range(len(L) - 1):
  D[i] = (L[i + 1] - L[i]) % MOD

DP = [[0] * (len(D)) for _ in range(K)]
for i in range(len(D)):
  DP[0][i] = D[i]

for i in range(1, K):
  S = [0] * len(D)
  S[0] = DP[i - 1][0]
  for j in range(1, len(D)):
    S[j] = S[j - 1] + DP[i - 1][j]
  for j in range(len(D)):
    DP[i][j] = S[-1 -j] * D[j] % MOD

print(sum(DP[K - 1]) % MOD)
    

Fixed submission:
def hersCode(l, r, n, N):
  ok = l
  ng = r + 1
  while abs(ok - ng) > 1:
    mid = abs(ok + ng) // 2
    if mid * n <= N:
      ok = mid
    else:
      ng = mid
  return ng


N, K = list(map(int, input().split()))
MOD = 10 ** 9 + 7

if N == 1:
  print(1)
  exit()

L = []
t = 1
n = N
while t <= N:
  L.append(t)
  t = hersCode(t, N, N // t ,N)

D = [0] * len(L)
L.append(N + 1)
for i in range(len(L) - 1):
  D[i] = (L[i + 1] - L[i]) % MOD
DP = [[0] * (len(D)) for _ in range(K)]
for i in range(len(D)):
  DP[0][i] = D[i]

for i in range(1, K):
  S = [0] * len(D)
  S[0] = DP[i - 1][0]
  for j in range(1, len(D)):
    S[j] = S[j - 1] + DP[i - 1][j]
  for j in range(len(D)):
    DP[i][j] = S[-1 -j] * D[j] % MOD

print(sum(DP[K - 1]) % MOD)
Buggy python submission (verdict: Runtime Error):
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

M = 10 * 5 + 1
D = [[0] * M for _ in range(M)]

X = {}
Y = {}
for x, y in xy:
  if x in X:
    X[x].append(y)
  else:
    X[x] = [y]
  if y in Y:
    Y[y].append(x)
  else:
    Y[y] = [x]
  D[x][y] = 1

ans = 0
for xx in X.keys():
  x = X[xx]
  L = len(x)
  if L == 1: continue
  for i in range(L - 1):
    if x[i] not in Y: continue
    y = Y[x[i]]
    for j in range(i + 1, L):
      for k in y:
        if D[k][x[j]] == 0:
          ans += 1

print(ans)



Fixed submission:
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

class Union:
  def __init__(s, n):
    s.N = n
    s.L = [-1] * n

  def root(s, x):
    if s.L[x] < 0:
      return x, -s.L[x]
    return s.root(s.L[x])

  def merge(s, x, y):
    a, ar = s.root(x)
    b, br = s.root(y)
    if a == b:
      return True
    if ar < br:
      s.L[b] -= ar
      s.L[a] = b
    else:
      s.L[a] -= br
      s.L[b] = a
    return False

  def getList(s):
    D = []
    DN = [0] * N
    for i in range(N):
      if s.L[i] < 0:
        DN[i] = len(D)
        D.append([])
    for i in range(N):
      D[DN[s.root(i)[0]]].append(i)
    return D

M = 10**5 + 1
xL = [-1] * M
yL = [-1] * M
uni = Union(N)

for i in range(N):
  x = xy[i][0]
  y = xy[i][1]
  if xL[x] != -1:
    uni.merge(xL[x], i)
  if yL[y] != -1:
    uni.merge(yL[y], i)
  xL[x] = i
  yL[y] = i

L = uni.getList()
ans = 0
for t in L:
  xL = [0] * M
  yL = [0] * M
  xN = 0
  yN = 0
  for i in t:
    x, y = xy[i]
    if xL[x] == 0:
      xL[x] = 1
      xN += 1
    if yL[y] == 0:
      yL[y] = 1
      yN += 1
  ans += xN * yN - len(t)

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
N, M = list(map(int, input().split()))
S = list(map(int, input().split()))
T = list(map(int, input().split()))
MOD = 10 ** 9 + 7

DP = [[0] * M for _ in range(N)]

t = 0
for i in range(M):
  if S[0] == T[i]:
    t += 1
  DP[0][i] = t

for i in range(1, N):
  cnt = 0
  while cnt < M:
    if cnt == 0:
      DP[i][0] = DP[i - 1][0]
      if S[i] == T[0]:
        DP[i][0] += 1
    else:
      if S[i] == T[cnt]:
        DP[i][cnt] = (DP[i - 1][cnt] + 1 + DP[i][cnt - 1]) % MOD
      else:
        DP[i][cnt] = (DP[i - 1][cnt] + DP[i][cnt - 1] - DP[i - 1][cnt - 1]) % MOD
      while DP[i][cnt] < MOD:
        DP[i][cnt] += MOD
    cnt += 1

print((DP[-1][-1] + 1) % MOD)


Fixed submission:
N, M = list(map(int, input().split()))
S = list(map(int, input().split()))
T = list(map(int, input().split()))
MOD = 10 ** 9 + 7

DP = [[0] * M for _ in range(N)]

t = 0
for i in range(M):
  if S[0] == T[i]:
    t += 1
  DP[0][i] = t

for i in range(1, N):
  cnt = 0
  while cnt < M:
    if cnt == 0:
      DP[i][0] = DP[i - 1][0]
      if S[i] == T[0]:
        DP[i][0] += 1
    else:
      if S[i] == T[cnt]:
        DP[i][cnt] = (DP[i - 1][cnt] + 1 + DP[i][cnt - 1]) % MOD
      else:
        DP[i][cnt] = (DP[i - 1][cnt] + DP[i][cnt - 1] - DP[i - 1][cnt - 1]) % MOD
      while DP[i][cnt] < MOD:
        DP[i][cnt] += MOD
    cnt += 1

print((DP[-1][-1] + 1) % MOD)
Buggy python submission (verdict: Runtime Error):
N, M = list(map(int, input().split()))
a = [int(input()) for _ in range(M)]

class comb():
  F = [1, 1]
  Fi = [1, 1]
  I = [0, 1]
  def __init__(self, num, mod):
    self.MOD = mod
    for i in range(2, num + 1):
      self.F.append((self.F[-1] * i) % mod)
      self.I.append(mod - self.I[mod % i] * (mod // i) % mod)
      self.Fi.append(self.Fi[-1] * self.I[i] % mod)
  def com(self, n, k):
    if n < k: return 0
    if n < 0 or k < 0: return 0
    return self.F[n] * (self.Fi[k] * self.Fi[n - k] % self.MOD) % self.MOD


MOD = 10 ** 9 + 7

for i in range(1, M):
  if a[i] - a[i - 1] == 1:
    print(0)
    exit()

com = comb(N, MOD)
ans = 1
x = 0
a = a + [N + 1]

for i in a:
  t = i - 1 - x
  at = 0
  for j in range(t // 2 + 1):
    k = t - j
    at = at + com.com(k, j) % MOD
  ans = ans * at % MODs
  x = i + 1
  

print(ans)

Fixed submission:
N, M = list(map(int, input().split()))
a = [int(input()) for _ in range(M)]

class comb():
  F = [1, 1]
  Fi = [1, 1]
  I = [0, 1]
  def __init__(self, num, mod):
    self.MOD = mod
    for i in range(2, num + 1):
      self.F.append((self.F[-1] * i) % mod)
      self.I.append(mod - self.I[mod % i] * (mod // i) % mod)
      self.Fi.append(self.Fi[-1] * self.I[i] % mod)
  def com(self, n, k):
    if n < k: return 0
    if n < 0 or k < 0: return 0
    return self.F[n] * (self.Fi[k] * self.Fi[n - k] % self.MOD) % self.MOD


MOD = 10 ** 9 + 7

for i in range(1, M):
  if a[i] - a[i - 1] == 1:
    print(0)
    exit()

com = comb(N, MOD)
ans = 1
x = 0
a = a + [N + 1]

for i in a:
  t = i - 1 - x
  at = 0
  for j in range(t // 2 + 1):
    k = t - j
    at = at + com.com(k, j) % MOD
  ans = ans * at % MOD
  x = i + 1
  

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
H, W = list(map(int, input().split()))
S = [input() for _ in range(H)]

g = [".", "#"]
HL = [[0] * W for _ in range(H)]
HR = [[0] * W for _ in range(H)]

for i in range(H):
  l = 0
  r = 0
  for j in range(W):
    if S[i][j] == g[0]:
      l += 1
    else:
      l = 0
    HL[i][j] = l
    if S[i][W - 1 - j] == g[0]:
      r += 1
    else:
      r = 0
    HR[i][W - 1 - j] = r

WU = [[0] * W for _ in range(H)]
WD = [[0] * W for _ in range(H)]

for i in range(W):
  u = 0
  d = 0
  for j in range(H):
    if S[j][i] == g[0]:
      u += 1
    else:
      u = 0
    WU[j][i] = u
    if S[H - j - 1][i] == g[0]:
      d += 1
    else:
      d = 0
    WD[H - j - 1][i] = d

ans = 0

for i in range(H):
  for j in range(W):
    k = HL[i][j] + HR[i][j] + WU[i][j] + WD[i][j] - 3
    ans = max(ans, k)

print(ans)

Fixed submission:
H, W = list(map(int, input().split()))
S = [input() for _ in range(H)]

g = [".", "#"]
HL = [[0] * W for _ in range(H)]
HR = [[0] * W for _ in range(H)]

for i in range(H):
  l = 0
  r = 0
  for j in range(W):
    if S[i][j] == g[0]:
      l += 1
    else:
      l = 0
    HL[i][j] = l
    if S[i][W - 1 - j] == g[0]:
      r += 1
    else:
      r = 0
    HR[i][W - 1 - j] = r

WU = [[0] * W for _ in range(H)]
WD = [[0] * W for _ in range(H)]

for i in range(W):
  u = 0
  d = 0
  for j in range(H):
    if S[j][i] == g[0]:
      u += 1
    else:
      u = 0
    WU[j][i] = u
    if S[H - j - 1][i] == g[0]:
      d += 1
    else:
      d = 0
    WD[H - j - 1][i] = d

ans = 0

for i in range(H):
  for j in range(W):
    k = HL[i][j] + HR[i][j] + WU[i][j] + WD[i][j] - 3
    ans = max(ans, k)

print(ans)
Buggy python submission (verdict: Runtime Error):
N, M = list(map(int, input().split()))

A = list(map(int, input().split()))
BC = [list(map(int, input().split())) for _ in range(M)]

A.sort()
BC.sort(key = lambda x: x[1], reverse = True)
cnt = 0
for b, c in BC:
  for i in range(b):
    if A[cnt] < c:
      A[cnt] = c
      cnt += 1
    else:
      break

print(sum(A))

Fixed submission:
N, M = list(map(int, input().split()))

A = list(map(int, input().split()))
BC = [list(map(int, input().split())) for _ in range(M)]

A.sort()
BC.sort(key = lambda x: x[1], reverse = True)
cnt = 0
for b, c in BC:
  for i in range(b):
    if A[cnt] < c:
      A[cnt] = c
      cnt += 1
      if cnt >= N:
        break
    else:
      break
  if cnt >= N:
    break

print(sum(A))
Buggy python submission (verdict: Runtime Error):
Q = int(input())
q = [list(map(int, input().split())) for _ in range(Q)]

def addT(n):
  k = 0
  while True:
    if T[k][0] >= n:
      T[k][1][1] += 1
      if T[k][1][0] == -1:
        T.append([n, [-1, 0], [-1, 0]])
        T[k][1][0] = t
        break
      else:
       k = T[k][1][0]
    else:
      T[k][2][1] += 1
      if T[k][2][0] == -1:
        T.append([n, [-1, 0], [-1, 0]])
        T[k][2][0] = t
        break
      else:
        k = T[k][2][0]

def getTmed(x, n):
  if T[x][1][1] == n - 1:
    return x
  elif T[x][1][1] > n - 1:
    return getTmed(T[x][1][0], n)
  else:
    return getTmed(T[x][2][0], n - (T[x][1][1] + 1))


T = []
b = 0
su = 0
for i in q:
  if T == []:
    T.append([i[1], [-1, 0], [-1, 0]])
    t = 1
    rk = i[1]
    b = i[2]
  elif i[0] == 2:
    k = getTmed(0, (t + 1) // 2)
    print(T[k][0], su + b)
  else:
    addT(i[1])
    k = getTmed(0, (t + 1) // 2)
    su += abs(T[k][0] - rk)
    rk = T[k][0]
    t += 1
    b += i[2]

Fixed submission:
Q = int(input())
Query = [list(map(int, input().split())) for _ in range(Q)]
import heapq

L = []
R = []
pop = heapq.heappop
push = heapq.heappush
A, B, C = 0, 0, 0

def nasu(a):
  global A
  global C
  if len(R) == 0:
    push(R, a)
    C = a
    return
  if len(L) == 0:
    r = pop(R)
    push(L, -min(a, r))
    push(R, max(a, r))
    A += abs(a - r)
    C = min(a, r)
    return
  if len(L) < len(R):
    r = pop(R)
    l = -pop(L)
    push(L, -l)
    push(L, -min(a, r))
    push(R, max(a, r))
    A += abs(a - r)
    if a < l:
      C = l
    elif a < r:
      C = a
    return
  l = -pop(L)
  r = pop(R)
  if l <= a and a <= r:
    push(L, -l)
    push(R, r)
    push(R, a)
    C = a
  elif a < l:
    push(L, -a)
    push(R, r)
    push(R, l)
    A += abs(a - l)
    C = l
  else:
    push(L, -l)
    push(R, a)
    push(R, r)
    A += abs(a - r)
    C = r

for q in Query:
  if q[0] == 1:
    nasu(q[1])
    B += q[2]
  if q[0] == 2:
    print(C, A + B)
Buggy python submission (verdict: Runtime Error):
N = int(input())
ab = [list(map(int, input().split())) for _ in range(N - 1)]

T = [[0] * N for _ in range(N)]
R = {}
for a, b in ab:
  T[a - 1][b - 1] = 1
  T[b - 1][a - 1] = 1
  if a - 1 in R:
    R[a - 1].append(b - 1)
  else:
    R[a - 1] = [b - 1]
  if b - 1 in R:
    R[b - 1].append(a - 1)
  else:
    R[b - 1] = [a - 1]

L = [0] * N
L[0] = 1
F = []
RL = {}
RL[1] = [0]
RL[2] = []
for i in R[0]:
  F.append(i)
  L[i] = 2
  RL[2].append(i)

k = 2
while F != []:
  k += 1
  Ft = []
  RL[k] = []
  for i in F:
    for j in R[i]:
      if L[j] == 0:
        L[j] = k
        Ft.append(j)
        RL[k].append(j)
  F = Ft

d = 0
D = [0] * N
for i in range(k - 1, 0, -1):
  for j in RL[i]:
    for k in R[j]:
      if L[k] == i - 1:
        if D[k] == 0:
          D[k] = D[j] + 1
          d = max(d, D[j] + 1)
        else:
          d = max(d, D[j] + D[k] + 1)
          D[k] = max(D[k], D[j] + 1)

if d % 3 == 1:
  print("Second")
else:
  print("First")


Fixed submission:
N = int(input())
if N == 1:
  print("First")
  exit()
ab = [list(map(int, input().split())) for _ in range(N - 1)]

R = {}
for a, b in ab:
  if a - 1 in R:
    R[a - 1].append(b - 1)
  else:
    R[a - 1] = [b - 1]
  if b - 1 in R:
    R[b - 1].append(a - 1)
  else:
    R[b - 1] = [a - 1]

L = [0] * N
L[0] = 1
F = []
RL = {}
RL[1] = [0]
RL[2] = []
for i in R[0]:
  F.append(i)
  L[i] = 2
  RL[2].append(i)

k = 2
while F != []:
  k += 1
  Ft = []
  RL[k] = []
  for i in F:
    for j in R[i]:
      if L[j] == 0:
        L[j] = k
        Ft.append(j)
        RL[k].append(j)
  F = Ft

d = 0
D = [0] * N
for i in range(k - 1, 0, -1):
  for j in RL[i]:
    for k in R[j]:
      if L[k] == i - 1:
        if D[k] == 0:
          D[k] = D[j] + 1
          d = max(d, D[j] + 1)
        else:
          d = max(d, D[j] + D[k] + 1)
          D[k] = max(D[k], D[j] + 1)

if d % 3 == 1:
  print("Second")
else:
  print("First")
Buggy python submission (verdict: Runtime Error):
N, Q = list(map(int, input().split()))
s = input()
td = [input().split() for i in range(Q)]

td.reverse()

nl = 0
nr = N - 1
L = []
R = []
for i in td:
  if i[1] == "L":
    if s[nl] == i[0]:
      L.append(i[0])
      nl += 1
    if len(R) == 0:
      continue
    if R[-1] == i[0]:
      R.pop()
      nr += 1
  else:
    if s[nr] == i[0]:
      R.append(i[0])
      nr -= 1
    if len(L) == 0:
      continue
    if L[-1] == i[0]:
      L.pop()
      nl -= 1

print(N - len(L) - len(R))

Fixed submission:
N, Q = list(map(int, input().split()))
s = input()
td = [input().split() for i in range(Q)]

td.reverse()

nl = 0
nr = N - 1
L = []
R = []
for i in td:
  if i[1] == "L":
    if nl < N:
      if s[nl] == i[0]:
        L.append(i[0])
        nl += 1
    if len(R) != 0:
      if R[-1] == i[0]:
        R.pop()
        nr += 1
  else:
    if nr >= 0:
      if s[nr] == i[0]:
        R.append(i[0])
        nr -= 1
    if len(L) != 0:
      if L[-1] == i[0]:
        L.pop()
        nl -= 1

print(N - len(L) - len(R))
Buggy python submission (verdict: Runtime Error):
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in range(N):
  Ans = (Ans * 2) % MOD
Ans -= 1

t = 0
k = 1
for i in L.values():
  N -= i
  if i != 1:
    t += (k * (2 ** N) * ((2 ** i) - (i + 1))) % MOD
  k *= i + 1

Ans -= t

print(int(Ans % MOD))

Fixed submission:
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in L.values():
  Ans = Ans * (i + 1) % MOD

Ans -= 1
if Ans < 0:
  Ans += MOD

print(int(Ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = (2 ** N - 1) % MOD
t = 0
k = 1
for i in L.values():
  N -= i
  if i != 1:
    t += (k * (2 ** N) * ((2 ** i) - (i + 1))) % MOD
  k *= i + 1

Ans -= t % MOD

print(int(Ans % MOD))

Fixed submission:
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in L.values():
  Ans = Ans * (i + 1) % MOD

Ans -= 1
if Ans < 0:
  Ans += MOD

print(int(Ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = (2 ** N - 1) % MOD
t = 0
k = 1
for i in L.values():
  N -= i
  if i != 1:
    t += (k * (2 ** N)) % MOD
  k *= i + 1

Ans -= t % MOD

print(int(Ans % MOD))

Fixed submission:
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in L.values():
  Ans = Ans * (i + 1) % MOD

Ans -= 1
if Ans < 0:
  Ans += MOD

print(int(Ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = (2 ** N - 1) % MOD
t = 0
k = 1
for i in L.values():
  N -= i
  if i != 1:
    t += k * (2 ** N)
  k *= i + 1

Ans -= t

print(int(Ans % MOD))

Fixed submission:
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in L.values():
  Ans = Ans * (i + 1) % MOD

Ans -= 1
if Ans < 0:
  Ans += MOD

print(int(Ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 2 ** N - 1
t = 0
k = 1
for i in L.values():
  N -= i
  if i != 1:
    t += k * (2 ** N)
  k *= i + 1

Ans -= t

print(int(Ans % MOD))

Fixed submission:
N = int(input())
S = input()

MOD = 1e9 + 7
L = {}
for i in S:
  if i in L:
    L[i] += 1
  else:
    L[i] = 1

Ans = 1
for i in L.values():
  Ans = Ans * (i + 1) % MOD

Ans -= 1
if Ans < 0:
  Ans += MOD

print(int(Ans))
Buggy python submission (verdict: Runtime Error):
import copy

N = int(input())
C = [input() for i in range(N)]

C2 = []
re = ""
L = {}
for i in C:
  if i != re:
    if i in L:
      L[i].append(len(C2))
    else:
      L[i] = []
    C2.append(i)
  re = i

LL = [-1] * len(C2)
for i in L:
  t = i
  for j in L[t]:
    LL[int(t)] = j
    t = j

DP = [-1] * (len(C2) + 1)

DP[-1] = 1
for i in range(len(C2) - 1, -1, -1):
  DP[i] = DP[i + 1]
  if LL[i] != -1:
    DP[i] += DP[LL[i]]

print(DP[0])


Fixed submission:
N = int(input())
C = [input() for i in range(N)]

MOD = 1e9 + 7

C2 = []
re = ""
L = {}
LL = [-1] * N
for i in C:
  if i != re:
    if i in L:
      LL[L[i]] = len(C2)
      L[i] = len(C2)
    else:
      L[i] = len(C2)
    C2.append(i)
  re = i


DP = [-1] * (len(C2) + 1)

DP[-1] = 1
for i in range(len(C2) - 1, -1, -1):
  DP[i] = DP[i + 1]
  if LL[i] != -1:
    DP[i] += DP[LL[i]] % MOD
print(int(DP[0] % MOD))

Buggy python submission (verdict: Time Limit Exceeded):
import copy
from collections import deque

N = int(input())
C = [input() for i in range(N)]

C2 = []
re = ""
L = {}
for i in C:
  if i != re:
    if i in L:
      L[i].append(len(C2))
    else:
      L[i] = deque([])
    C2.append(i)
  re = i

LL = [-1] * len(C2)
for i in range(len(C2)):
  if L[C2[i]] != []:
    LL[i] = copy.deepcopy(L[C2[i]])
    if len(L[C2[i]]) > 0:
      L[C2[i]].popleft()

DP = [-1] * (len(C2) + 1)

DP[-1] = 1
for i in range(len(C2) - 1, -1, -1):
  DP[i] = DP[i + 1]
  if LL[i] != -1:
    for j in LL[i]:
      DP[i] += DP[j + 1]

print(DP[0])

Fixed submission:
N = int(input())
C = [input() for i in range(N)]

MOD = 1e9 + 7

C2 = []
re = ""
L = {}
LL = [-1] * N
for i in C:
  if i != re:
    if i in L:
      LL[L[i]] = len(C2)
      L[i] = len(C2)
    else:
      L[i] = len(C2)
    C2.append(i)
  re = i


DP = [-1] * (len(C2) + 1)

DP[-1] = 1
for i in range(len(C2) - 1, -1, -1):
  DP[i] = DP[i + 1]
  if LL[i] != -1:
    DP[i] += DP[LL[i]] % MOD
print(int(DP[0] % MOD))
Buggy python submission (verdict: Runtime Error):
def rootT(x):
  if x == T[x]:
    return x
  x = T[x]
  return rootT(x)

def mergeT(x, y):
  a = rootT(x)
  b = rootT(y)
  if a != b:
    if unionTable[a] > unionTable[b]:
      T[b] = a
      NumTable[a] += NumTable[b]
    else:
      T[a] = b
      NumTable[b] += NumTable[a]

N, M = list(map(int, input().split()))
AB = [list(map(int, input().split())) for i in range(M)]

AB.reverse()

T = [i for i in range(N + 1)]
unionTable = [-1 for i in range(N + 1)]
NumTable = [1 for i in range(N + 1)]

L = []
Ans = N * (N - 1) // 2
for i in AB:
  L.append(Ans)
  a = rootT(i[0])
  b = rootT(i[1])
  if a != b:
    ta = NumTable[a]
    tb = NumTable[b]
    mergeT(a, b)
    Ans -= (ta + tb) * (ta + tb - 1) // 2  - ta * (ta - 1) // 2 - tb * (tb - 1) // 2
    mergeT(a, b)

for i in L[::-1]:
  print(i)

Fixed submission:
def rootT(x):
  if x == T[x]:
    return x
  x = T[x]
  return rootT(x)

def mergeT(x, y):
  a = rootT(x)
  b = rootT(y)
  if a != b:
    if NumTable[a] > NumTable[b]:
      T[b] = a
      NumTable[a] += NumTable[b]
    else:
      T[a] = b
      NumTable[b] += NumTable[a]

N, M = list(map(int, input().split()))
AB = [list(map(int, input().split())) for i in range(M)]

AB.reverse()

T = [i for i in range(N + 1)]
NumTable = [1 for i in range(N + 1)]

L = []
Ans = N * (N - 1) // 2
for i in AB:
  L.append(Ans)
  a = rootT(i[0])
  b = rootT(i[1])
  if a != b:
    ta = NumTable[a]
    tb = NumTable[b]
    mergeT(a, b)
    Ans -= (ta + tb) * (ta + tb - 1) // 2  - ta * (ta - 1) // 2 - tb * (tb - 1) // 2
    mergeT(a, b)

for i in L[::-1]:
  print(i)