leetcode-389-Find-the-Difference

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描述

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:

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Input:
s = "abcd"
t = "abcde"

Output:
e

Explanation:
'e' is the letter that was added.

分析

利用异或运算的特性，记得 RAID5 也是用这个算法实现的。

解决方案1(Java)

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class Solution {
    public char findTheDifference(String s, String t) {
        int n = t.length();
        char result = t.charAt(n-1);
        for (int i = 0; i < n-1; i++) {
            result ^= s.charAt(i);
            result ^= t.charAt(i);
        }
        return result;
    }
}

相关问题

(E) Single Number

题目来源