foo.cc: In function 'int main()':
foo.cc:24:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |                         for(int j = 1; j < p[i].size(); ++j){
      |                                        ~~^~~~~~~~~~~~~
foo.cc:29:36: warning: unused variable 't' [-Wunused-variable]
   29 |                         int j = 0, t = 0;
      |                                    ^

[Hydro](https://hydro.ac)提供评测服务