Buggy python submission (verdict: Time Limit Exceeded):
def get_unique_list(seq):
    seen = []
    return [x for x in seq if x not in seen and not seen.append(x)]

H, W = list(map(int, input().split()))

D = []
for i in range(H):
  D.append(input())

M = [[0] * W for i in range(H)]
LT = [[0]]
for i in range(H):
  for j in range(W):
    if i == 0 and j == 0:
      continue
    flag = False
    if i != 0:
      if D[i][j] != D[i-1][j]:
        M[i][j] = M[i-1][j]
        flag = True
    if j != 0:
      if D[i][j] != D[i][j-1]:
        M[i][j] = M[i][j-1]
        if flag == True:
          for k in LT[M[i][j-1]]:
            LT[k].extend(LT[M[i-1][j]])
            LT[k] = list(set(LT[k]))
          for k in LT[M[i-1][j]]:
            LT[k].extend(LT[M[i][j-1]])
            LT[k] = list(set(LT[k]))
        flag = True
    if flag == False:
        M[i][j] = len(LT)
        LT.append([len(LT)])
        
LT = get_unique_list(LT)
L = [[] for i in range(len(LT))]
for i in range(H):
  for j in range(W):
    for k in range(len(LT)):
      if M[i][j] in LT[k]:
        L[k].append((i, j))
        break

cnt = 0
for i in L:
  E = 0
  A = 0
  for j in i:
    if (j[0] + j[1]) % 2 == 0:
      E += 1
    else:
      A += 1
  cnt += E * A
print(cnt)


Fixed submission:
def getminLT(i):
  if LT[i] == i:
    return i
  else:
    return getminLT(LT[i])

H, W = list(map(int, input().split()))

D = []
for i in range(H):
  D.append(input())

M = [[0] * W for i in range(H)]
LT = [0]
for i in range(H):
  for j in range(W):
    if i == 0 and j == 0:
      continue
    flag = False
    if i != 0:
      if D[i][j] != D[i-1][j]:
        M[i][j] = M[i-1][j]
        flag = True
    if j != 0:
      if D[i][j] != D[i][j-1]:
        M[i][j] = M[i][j-1]
        if flag == True:
          
          LT[max(getminLT(M[i-1][j]), getminLT(M[i][j-1]))] = LT[min(getminLT(M[i][j-1]), getminLT(M[i-1][j]))]
        flag = True
    if flag == False:
        M[i][j] = len(LT)
        LT.append(len(LT))
for i in range(len(LT)):
  LT[i] = getminLT(LT[i])
  
L = [[] for i in range(len(LT))]
for i in range(H):
  for j in range(W):
  	L[LT[M[i][j]]].append((i, j))
#print(M)
#print(LT)
#print(L)
cnt = 0
for i in L:
  E = 0
  A = 0
  for j in i:
    if (j[0] + j[1]) % 2 == 0:
      E += 1
    else:
      A += 1
  cnt += E * A
print(cnt)

Buggy python submission (verdict: Runtime Error):
def check(i, j):
  T = []
  if i >= 1:
    if M[i-1][j] == 0:
      if D[i][j] != D[i-1][j]:
        T.append((i-1, j))
        M[i-1][j] = 1
        T.extend(check(i-1, j))
  if i < H - 1:
    if M[i+1][j] == 0:
      if D[i][j] != D[i+1][j]:
        T.append((i+1, j))
        M[i+1][j] = 1
        T.extend(check(i+1,j))
  if j >= 1:
    if M[i][j-1] == 0:
      if D[i][j] != D[i][j-1]:
        T.append((i, j-1))
        M[i][j-1] = 1
        T.extend(check(i, j-1))
  if j < W - 1:
    if M[i][j+1] == 0:
      if D[i][j] != D[i][j+1]:
        T.append((i, j+1))
        M[i][j+1] = 1
        T.extend(check(i, j+1))
  return T

H, W = list(map(int, input().split()))

D = []
for i in range(H):
  D.append(input())

M = [[0] * W for i in range(H)]
L = []
for i in range(H):
  for j in range(W):
    if M[i][j] == 0:
      L.append(check(i, j))

cnt = 0
for i in L:
  E = 0
  A = 0
  for j in i:
    if (j[0] + j[1]) % 2 == 0:
      E += 1
    else:
      A += 1
  cnt += E * A
print(cnt)

Fixed submission:
def getminLT(i):
  if LT[i] == i:
    return i
  else:
    return getminLT(LT[i])

H, W = list(map(int, input().split()))

D = []
for i in range(H):
  D.append(input())

M = [[0] * W for i in range(H)]
LT = [0]
for i in range(H):
  for j in range(W):
    if i == 0 and j == 0:
      continue
    flag = False
    if i != 0:
      if D[i][j] != D[i-1][j]:
        M[i][j] = M[i-1][j]
        flag = True
    if j != 0:
      if D[i][j] != D[i][j-1]:
        M[i][j] = M[i][j-1]
        if flag == True:
          
          LT[max(getminLT(M[i-1][j]), getminLT(M[i][j-1]))] = LT[min(getminLT(M[i][j-1]), getminLT(M[i-1][j]))]
        flag = True
    if flag == False:
        M[i][j] = len(LT)
        LT.append(len(LT))
for i in range(len(LT)):
  LT[i] = getminLT(LT[i])
  
L = [[] for i in range(len(LT))]
for i in range(H):
  for j in range(W):
  	L[LT[M[i][j]]].append((i, j))
#print(M)
#print(LT)
#print(L)
cnt = 0
for i in L:
  E = 0
  A = 0
  for j in i:
    if (j[0] + j[1]) % 2 == 0:
      E += 1
    else:
      A += 1
  cnt += E * A
print(cnt)