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'''

Created on 2013-5-16

@author: Yubin Bai

'''

import collections

class Solution:

# @return a string

def minWindow(self, S, T):

target = collections.Counter(T)

current = {}

for i in target:

current[i] = 0

leftMin, rightMin, currMin = 0, 0, 1 << 33

left = right = 0

for right in range(len(S)):

if S[right] in target:

current[S[right]] += 1

if all([current[x] >= target[x] for x in target]):

while left <= right:

if S[left] not in target:

left += 1

elif current[S[left]] - target[S[left]] >= 1:

current[S[left]] -= 1

left += 1

else: # cannot shorten more

break

if currMin >= right - left + 1:

leftMin, rightMin, currMin = left, right, right - left + 1

if currMin == 1 << 33:

return ""

else:

return S[leftMin:rightMin + 1]

if __name__ == '__main__':

S = "ADOBECODEBANC"

T = "ABC"

# S = "a"

# T = "aa"

# S = "a"

# T = "b"

s = Solution()

print(s.minWindow(S, T))