Compilare: user.cpp: In function ‘int BFS()’: user.cpp:41:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[node].adj.size(); i++ ) ^ user.cpp: In function ‘void maxflow()’: user.cpp:56:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[N].adj.size(); i++ ) ^ user.cpp: In function ‘void BFS2(int, bool*)’: user.cpp:89:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].adj.size(); ++i) ^ user.cpp: In function ‘void solve()’: user.cpp:107:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Edges.size(); ++i) ^ user.cpp:110:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Edges.size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:20:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:23:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &u, &v, &capacity); ^