foo.cc: In function 'int main()':
foo.cc:25:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |                         while(j < V[i].size() && t+V[i][j] <= h){
      |                               ~~^~~~~~~~~~~~~

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