LeetCode_Longest Common Prefix

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

　　

class Solution {
public:
    string longestCommonPrefix(vector<string> &strs) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        string result="";
        if(strs.size() == ) return result ;

        string first = strs[] ;

        for(int i = ; i < first.size() ;i++)
        {
           char c = first[i] ;
           for(int j = ; j< strs.size(); j++)
             if(i > strs[j].size() - ||  c != strs[j][i])
                 return result;

            result+=c;
        }

        return result ;
    }
};