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find-the-difference.py
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find-the-difference.py
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# Time: O(n)
# Space: O(1)
# Given two strings s and t which consist of only lowercase letters.
#
# String t is generated by random shuffling string s
# and then add one more letter at a random position.
#
# Find the letter that was added in t.
#
# Example:
#
# Input:
# s = "abcd"
# t = "abcde"
#
# Output:
# e
#
# Explanation:
# 'e' is the letter that was added.
import operator
import collections
class Solution(object):
def findTheDifference(self, s, t):
"""
:type s: str
:type t: str
:rtype: str
"""
return chr(reduce(operator.xor, map(ord, s), 0) ^ reduce(operator.xor, map(ord, t), 0))
def findTheDifference2(self, s, t):
"""
:type s: str
:type t: str
:rtype: str
"""
t = list(t)
s = list(s)
for i in s:
t.remove(i)
return t[0]
def findTheDifference3(self, s, t):
return chr(reduce(operator.xor, map(ord, s + t)))
def findTheDifference4(self, s, t):
return list((collections.Counter(t) - collections.Counter(s)))[0]
def findTheDifference5(self, s, t):
s, t = sorted(s), sorted(t)
return t[-1] if s == t[:-1] else [x[1] for x in zip(s, t) if x[0] != x[1]][0]
if __name__ == '__main__':
s = Solution()
r = s.findTheDifference2('abcd', 'abcde')
print r