Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vecin[nod].size();i++){ ^ user.cpp: In function ‘bool solve(int, int, int, int)’: user.cpp:33:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (drum.size()<nivel[lca]-nivel[V] &&drumC.size()<nivel[lca]-nivel[V]){ ^ user.cpp:33:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (drum.size()<nivel[lca]-nivel[V] &&drumC.size()<nivel[lca]-nivel[V]){ ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (drumC.size()-1==C) C=drum.size(); ^ user.cpp: In function ‘int main()’: user.cpp:77:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fantasy.in","r",stdin); ^ user.cpp:78:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fantasy.out","w",stdout); ^ user.cpp:81:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&t); ^ user.cpp:83:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d",&n,&D,&C,&V); ^ user.cpp:87:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^