Compilare: main.cpp: In function 'void solve()': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i=0;i<q[0].size();i++) | ~^~~~~~~~~~~~ main.cpp:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int p=1;p<q.size();p++) | ~^~~~~~~~~ main.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i=0;i<rows.size();i++) | ~^~~~~~~~~~~~ main.cpp:61:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for(int i=0;i<rows.size();i++) | ~^~~~~~~~~~~~ main.cpp:62:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for(int j=0;j<rows[i].size();j++) | ~^~~~~~~~~~~~~~~