Compilare: user.cpp: In function ‘bool dfs(int)’: user.cpp:14:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i1=0; i1<a[x].size(); ++i1) ^ user.cpp: In function ‘int main()’: user.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<cycle.size(); ++i) printf("%d ",cycle[i]+1); ^ 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("victorie.in","r",stdin); ^ user.cpp:37:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("victorie.out","w",stdout); ^ user.cpp:38:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:43:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^