Compilare: main.cpp: In function 'int main()': main.cpp:83:63: warning: narrowing conversion of 'g[nr[x2][y2]].std::vector<_Tp, _Alloc>::size<numar, std::allocator<numar> >()' from 'std::vector<numar>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[nr[x1][y1]].push_back({nr[x2][y2],g[nr[x2][y2]].size()}); ~~~~~~~~~~~~~~~~~~^~ main.cpp:84:65: warning: narrowing conversion of '(g[nr[x1][y1]].std::vector<_Tp, _Alloc>::size<numar, std::allocator<numar> >() - 1ul)' from 'std::vector<numar>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[nr[x2][y2]].push_back({nr[x1][y1],g[nr[x1][y1]].size()-1}); ~~~~~~~~~~~~~~~~~~~~^~ main.cpp:104:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=start[nod];j<g[nod].size();j++){ ~^~~~~~~~~~~~~~