foo.cc: In function 'int main()':
foo.cc:17:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for(int i=0,j=0,e=(n==1?0:1);i<t.size();i++,j+=e){
      |                               ~^~~~~~~~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务