Compilare: user.cpp: In function ‘int bfs()’: user.cpp:35:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graf[node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:72:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graf[n].size(); ++i) ^ user.cpp:54:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "r", stdin); ^ user.cpp:55:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out", "w", stdout); ^ user.cpp:59:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:63:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^