Compilare: user.cpp: In function ‘void addedge(int, int)’: user.cpp:29:32: 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] g[i].push_back({j, g[j].size() , cap[i][j], 0}); ^ user.cpp:30:34: warning: narrowing conversion of ‘(g[i].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() + 4294967295u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[j].push_back({i, g[i].size() - 1, cap[j][i], 0}); ^ user.cpp: In function ‘bool bfs()’: user.cpp:41:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[from].size(); ++ k) { ^ user.cpp: In function ‘int dfs(int, int)’: user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[from].size(); ++ k) { ^ user.cpp: In function ‘int maxflow()’: user.cpp:74:19: warning: unused variable ‘nr’ [-Wunused-variable] int answer = 0, nr = 0;; ^