Compilare: user.cpp: In function ‘int main()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fr[i].size()>maxx && fr[i].size()==n-i) { maxx=fr[i].size(); pas=i; } ^ user.cpp:15:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fr[i].size()>maxx && fr[i].size()==n-i) { maxx=fr[i].size(); pas=i; } ^ user.cpp:17:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<fr[pas].size();i++) printf("%d\n",fr[pas][i]); ^ user.cpp:8:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.in","r",stdin); ^ user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mincinosi.out","w",stdout); ^ user.cpp:10:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); fr[x].push_back(i); ^