Compilare: main.cpp: In function 'void Fill(int, int)': main.cpp:62:35: warning: narrowing conversion of 'st.std::stack<_Tp, _Sequence>::size<inf, std::deque<inf, std::allocator<inf> > >()' from 'std::stack<inf>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] st.push({i,j,lin2,col2,st.size()}); ~~~~~~~^~