/in/foo.cc: In function 'int main()':
/in/foo.cc:89:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |             for (int x = 1; x < s[u].size(); ++x) {
      |                             ~~^~~~~~~~~~~~~
/in/foo.cc:94:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |             for (int t = t_min; t < dp[u].size() && t <= t_max; ++t) {
      |                                 ~~^~~~~~~~~~~~~~