foo.cc: In function 'void init(std::vector<std::vector<int> >&)':
foo.cc:11:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for (int i = 0; i < v.size(); i++)
      |                     ~~^~~~~~~~~~
foo.cc:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for (int i = 0; i < v[0].size(); i++){
      |                     ~~^~~~~~~~~~~~~
foo.cc:16:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         for (int j = 1; j < v.size(); j++)
      |                         ~~^~~~~~~~~~
foo.cc: In function 'int Solve(std::vector<std::vector<int> >&)':
foo.cc:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i = 0; i < v.size(); i++)
      |                     ~~^~~~~~~~~~
foo.cc:25:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for (int j = 0; j < v[i].size(); j++)
      |                         ~~^~~~~~~~~~~~~

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