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Tested Python solution for LeetCode 389 with 14 pytest cases. Generate a practice environment with lcpy.
lcpy gen -n 389 # by problem number
lcpy gen -s find_the_difference # by problem name
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.
Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.
Input: s = "", t = "y"
Output: "y"
0 <= s.length <= 1000t.length == s.length + 1s and t consist of lowercase English letters.class Solution:
# Time: O(n)
# Space: O(1)
def find_the_difference(self, s: str, t: str) -> str:
acc = 0
for ch in s:
acc ^= ord(ch)
for ch in t:
acc ^= ord(ch)
return chr(acc)
| Time | Space |
|---|---|
| O(n) | O(1) |