Compilare: user.cpp: In function ‘void addedge(int, int)’: user.cpp:30:31: warning: narrowing conversion of ‘g[j].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge direct = {j, g[j].size(), 1, 0}; ^ user.cpp:31:32: warning: narrowing conversion of ‘g[i].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge inverse = {i, g[i].size(), 0, 0}; ^ user.cpp: In function ‘bool bfs()’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp: In function ‘int dfs(int, int)’: user.cpp:76:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^ user.cpp: In function ‘void tracesol()’: user.cpp:105:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[i].size(); j++){ ^