Compilare: main.cpp: In function 'int main()': main.cpp:98:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= shelves.size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:106:27: warning: narrowing conversion of '(((std::vector<std::pair<int, int> >::size_type)i) + shelves.std::vector<_Tp, _Alloc>::size<std::pair<int, int>, std::allocator<std::pair<int, int> > >())' from 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[D].push_back({i + shelves.size(), 0}); ~~^~~~~~~~~~~~~~~~ main.cpp:111:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= shelves.size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp:112:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= shelves.size(); j++) ~~^~~~~~~~~~~~~~~~~ main.cpp:115:35: warning: narrowing conversion of '(((std::vector<std::pair<int, int> >::size_type)j) + shelves.std::vector<_Tp, _Alloc>::size<std::pair<int, int>, std::allocator<std::pair<int, int> > >())' from 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[i].push_back({j + shelves.size(), DST(i, j)}); ~~^~~~~~~~~~~~~~~~