foo.cc: In function 'int main()':
foo.cc:18:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |   for (int j = 0; j < quest[i].size() - 1; j++) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:17:7: warning: unused variable 'last' [-Wunused-variable]
   17 |   int last = 0, priority = 0;
      |       ^~~~

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