Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:10:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:53:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<G[a].size();l++){ ^ user.cpp:21:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("iepuri2.in","r",stdin); ^ user.cpp:22:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("iepuri2.out","w",stdout); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:27:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp:63:28: warning: ‘Rad’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n",d[Rad][1]); ^