You are given two strings s
and t
.
String t
is generated by random shuffling string s
and then add one more letter at a random position.
Return the letter that was added to t
.
Example 1:
Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.
Example 2:
Input: s = "", t = "y"
Output: "y"
Constraints:
-
0 <= s.length <= 1000
-
t.length == s.length + 1
-
s
andt
consist of lowercase English letters.
SOLUTION:
class Solution:
def findTheDifference(self, s: str, t: str) -> str:
ctr = {}
for c in t:
ctr[c] = ctr.get(c, 0) + 1
for c in s:
ctr[c] -= 1
if ctr[c] == 0:
del ctr[c]
return list(ctr)[0]
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