心得：
題目要求找出字串變數s與t差異的字母，變數t一定大於變數s且都為小寫，跑兩個迴圈就解決了。
問題：
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.
答案：
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public class Solution { public char FindTheDifference(string s, string t) { for (int i = 0; i < s.Length; i++) { for (int j = 0; j < t.Length; j++) { if (s[i] == t[j]) { t = t.Remove(j, 1); break; } } } return t.Length == 1 ? t[0] : new char(); } } |
