foo.cc: In function ‘int main()’:
foo.cc:12:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   12 |                 for(int j=1;j<=e.size();j++){
      |                             ~^~~~~~~~~~

正在同步测试数据，请稍后