[389]Find the Difference
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.
Code
Python
class Solution(object):
def findTheDifference(self, s, t):
"""
:type s: str
:type t: str
:rtype: str
"""
if s == None:
return t[0]
Dict = {}
for char in s:
if char in Dict:
Dict[char] += 1
else:
Dict[char] = 1
for char in t:
if char in Dict:
if Dict[char] == 0:
return char
else:
Dict[char] -= 1
else:
return char
return False