foo.cc: In function 'void SortRow(std::vector<std::vector<int> >&)':
foo.cc:7:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for(int i=0;i<M.size();i++)
      |              ~^~~~~~~~~
foo.cc:9:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |   for(int j=0;j<M[0].size();j++)
      |               ~^~~~~~~~~~~~
foo.cc:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |    for(int k=j+1;k<M[0].size();k++)
      |                  ~^~~~~~~~~~~~
foo.cc: In function 'void Output(std::vector<std::vector<int> >&)':
foo.cc:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |  for(int i=0;i<M.size();i++)
      |              ~^~~~~~~~~
foo.cc:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |   for(int j=0;j<M[0].size();j++)
      |               ~^~~~~~~~~~~~

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