Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:24:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < v[k].size(); i++) ^ user.cpp: In function ‘int flow(int, int)’: user.cpp:45:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < v[dest].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:112:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < g[i].size(); j++) ^