不在状态，坐的我屁股疼

class Solution {
public:
    /**
     * 
     * @param strs string字符串vector 
     * @return string字符串
     */
    string longestCommonPrefix(vector<string>& strs) {
      if (strs.empty()) {
        return std::string();
      }
      
      for (int i = 0; i < strs[0].size(); ++i) {
        char tmp = strs[0][i];
        for (int j = 1; j < strs.size(); ++j) {
          if (tmp != strs[j][i] || i >= strs[j].size()) {
            return strs[0].substr(0, i);
          }
        }
      }
      
      return strs[0];
    }
};