Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[u].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<q.size() and A>q[j]) {printf("%d\n",n-tr.s[1]);j++;} ^ user.cpp:84:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<q.size()) {printf("%d\n",n-tr.s[1]);j++;} ^ user.cpp:52:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curent.in","r",stdin); ^ user.cpp:53:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curent.out","w",stdout); ^ user.cpp:58:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&u); ^ user.cpp:66:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&A,&b,&c); ^ user.cpp:72:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] while(m1--) {scanf("%d",&x);q.push_back(x);} ^