[LeetCode] 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.
 一开始想用hashtable 来着,提交了以后发现完全没有考虑重复字符的情况。。。。最后采用排序然后线性扫描。应该没有更简单的方法了吧
/**
* @param {string} s
* @param {string} t
* @return {character}
*/
var findTheDifference = function(s, t) {
var ss = s.split('').sort();
var st = t.split('').sort();
var i = 0;
while (1) {
if (st[i] !== ss[i]) return st[i];
i++;
}
};
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