Find the Difference (E)
题目
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.
题意
字符串t由字符串s乱序后加入一个随机字母得到，求这个随机的字母。
思路
直接hash记录每个字符的个数在进行比较。
代码实现
Java
class Solution {
public char findTheDifference(String s, String t) {
int[] hash = new int[26];
for (char c : s.toCharArray()) {
hash[c - 'a']++;
}
for (char c : t.toCharArray()) {
hash[c - 'a']--;
}
int i = 0;
while (hash[i] == 0) {
i++;
}
return (char)('a' + i);
}
}
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