14. Longest Common Prefix

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

输出几个字符串的最长公共前缀

C++(6ms):

class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        int len = strs.size() ;
        string res = "" ;
        if (len < 1)
            return res ;
        int minLen = strs[0].length() ;
        for(int i = 0 ; i < len ; i++){
            if (strs[i].length() < minLen)
                minLen = strs[i].length() ;
        }
        for(int j = 0  ; j < minLen ; j++){
            for(int i = 1 ; i < len ; i++){
                if (strs[0][j] != strs[i][j])
                    return res ;
            }
            res += strs[0][j] ;
        }
        return res ;
    }
};