【Longest Common Prefix】cpp

class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
            if ( strs.size()==0 ) return "";
            std::string tmp_str = strs[0];
            for ( size_t i = 1; i < strs.size(); ++i )
            {
                size_t j = 0;
                for ( ; j < std::min(tmp_str.size(), strs[i].size()); ++j ) 
                    if ( tmp_str[j]!=strs[i][j] ) break;
                tmp_str = tmp_str.substr(0,j);
            }
            return tmp_str;
    }
};