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| class Solution:
def minWindow(self, word1: str, word2: str) -> str:
ans = 0
b_cnt = defaultdict(int)
for s in word2:
b_cnt[s] += 1
n = len(word1)
a_cnt = defaultdict(int)
tmp = 0
st = 0
for i in range(0, n):
if tmp == len(word2):
break
st = i
a_cnt[word1[i]] += 1
if a_cnt[word1[i]] == b_cnt[word1[i]]:
tmp += b_cnt[word1[i]]
if tmp != len(word2):
return ""
ans = 0
tt = 0
while a_cnt[word1[tt]] - 1 >= b_cnt[word1[tt]]:
a_cnt[word1[tt]] -= 1
tt += 1
l = tt
r = st
mi = st - tt
for i in range(st+1, n):
a_cnt[word1[i]] += 1
while a_cnt[word1[tt]] - 1 >= b_cnt[word1[tt]]:
a_cnt[word1[tt]] -= 1
tt += 1
if i - tt < mi:
mi = i - tt
l = tt
r = i
return word1[l:r+1]
|