Compilare: user.cpp: In function ‘int main()’: user.cpp:27:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < l[n].size(); i++) ^ user.cpp: In function ‘bool bfs()’: user.cpp:62:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < l[aux].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:16:35: 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:17:37: 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:18:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:20:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^