每日算法之十三：Longest Common Prefix

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

求解多条字符串的最长公共前缀。

class Solution {
 public:
     string longestCommonPrefix(vector<string> &strs) {
         string result;
         int len=strs.size();
         int i,j;
         if(len==0)return "";
         for(j=0;;++j)
         {
             for(i=0;i<len;++i)
                 if(j>=strs[i].length()||strs[i][j]!=strs[0][j])break;
             if(i<len)break;
             result+=strs[0][j];
         }
         return result;        
     }
 };