Compilare: user.cpp: In function ‘void addEdge(int, int)’: user.cpp:21:36: warning: narrowing conversion of ‘g[y].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[x].push_back({y , 0 , g[y].size()}); ~~~~~~~~~^~ user.cpp:22:39: warning: narrowing conversion of ‘(g[x].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() - 1u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[y].push_back({x , 0 , g[x].size() - 1}); ~~~~~~~~~~~~^~~ user.cpp: In function ‘void dfs(int, int&)’: user.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ;h < g[node].size() ;h++){ ~~^~~~~~~~~~~~~~~~