Leetcode | Longest Common Prefix

 1 class Solution {
 2 public:
 3     string longestCommonPrefix(vector<string> &strs) {
 4         if (strs.empty()) return "";
 5         if (strs.size() == 1) return strs[0];
 6         for (int len = 0; ; len++) {
 7             for (int i = 1; i < strs.size(); ++i) {
 8                 if (len >= strs[i].length() || len >= strs[i - 1].length() || strs[i][len] != strs[i - 1][len]) {
 9                     if (len > 0) return strs[0].substr(0, len);
10                     else return "";
11                 }
12             }
13         }
14         return "";
15     }
16 };