[LeetCode] Longest Common Prefix

Write a function to find the longest common prefix string amongst an array of strings.

模拟法，先选取第一个字符串，之后依次和后面的字符串得出LCP

 1 class Solution {
 2 public:
 3     string longestCommonPrefix(vector<string> &strs) {
 4         // Start typing your C/C++ solution below
 5         // DO NOT write int main() function
 6         if (strs.size() == 0)
 7             return "";
 8             
 9         string s = strs[0];
10         
11         for(int i = 1; i < strs.size(); i++)
12         {
13             int j = 0;
14             
15             int len = min(strs[i].size(), s.size());
16             
17             while(j < len)
18             {
19                 if (strs[i][j] != s[j])
20                     break;
21                 j++;
22             }
23             
24             s.erase(j, s.size());
25         }
26         
27         return s;
28     }
29 };