foo.cc: In function 'int main()':
foo.cc:26:23: error: conflicting declaration 'std::vector<std::vector<int> > M'
26 | vector<vector<int> > M(m, vector<int>(n,0) );
| ^
foo.cc:19:14: note: previous declaration as 'std::vector<int> M'
19 | vector<int> M(m,n);
| ^
foo.cc:29:15: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
29 | cin>>M[i][j];
| ^
foo.cc:30:10: error: invalid initialization of reference of type 'std::vector<std::vector<int> >&' from expression of type 'std::vector<int>'
30 | SortCol(M);
| ^
foo.cc:7:36: note: in passing argument 1 of 'void SortCol(std::vector<std::vector<int> >&)'
7 | void SortCol(vector<vector<int> > &M);
| ~~~~~~~~~~~~~~~~~~~~~~^
foo.cc:31:9: error: invalid initialization of reference of type 'std::vector<std::vector<int> >&' from expression of type 'std::vector<int>'
31 | Output(M);
| ^
foo.cc:5:35: note: in passing argument 1 of 'void Output(std::vector<std::vector<int> >&)'
5 | void Output(vector<vector<int> > &M);
| ~~~~~~~~~~~~~~~~~~~~~~^
foo.cc: In function 'void Output(std::vector<std::vector<int> >&)':
foo.cc:36:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | for(int i=0; i<M.size(); i++)
| ~^~~~~~~~~
foo.cc:38:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | for(int j=0; j<M[i].size(); j++)
| ~^~~~~~~~~~~~
foo.cc: In function 'void SortRow(std::vector<std::vector<int> >&)':
foo.cc:82:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | for(int k=0; k<M.size(); k++)
| ~^~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:17:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
17 | scanf("%d", &a[i][j]);
| ~~~~~^~~~~~~~~~~~~~~~
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