Compilare: user.cpp: In function ‘int main()’: user.cpp:26:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<mp[it->first].size();i++) printf("%d ",mp[it->first][i]); ^ user.cpp:27:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<mp[m-it->first].size();i++) printf("%d ",mp[m-it->first][i]); ^ user.cpp:10:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("loto.in","r",stdin); ^ user.cpp:11:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("loto.out","w",stdout); ^ user.cpp:12:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:13:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=n;i++) scanf("%d",&t[i]); ^