Leetcode 之Longest Common Prefix（33）

string longestComPrefix(vector<string> &strs)
      {
          if (strs.empty())return " ";

          //纵向比较
          for (int idx = 0; idx < strs[0].size(); idx++)
          {
              for (int i = 0; i < strs.size(); i++)
              {
                  if (strs[0][idx] != strs[i][idx])return strs[0].substr(0, idx);
              }
          }
          return strs[0];
      }