self.d = collections.Counter()
def _del_if_zero(self, char):
def decrement(self, char):
def increment(self, char):
def findAnagrams(self, s: str, p: str) -> List[int]:
for i in range(len(p), len(s)):
start, end = s[i - len(p)], s[i]
ans.append(i - len(p) + 1)