Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[aux].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[n].size(); i++){ ^ user.cpp:35:35: 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:36:37: 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:37:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:39:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^