Compilare: user.cpp: In function ‘int main()’: user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(gg[i].size()==sum) ~~~~~~~~~~~~^~~~~ user.cpp:80:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<gg[i].size(); ++j) ~^~~~~~~~~~~~~ user.cpp:104:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<gg[i].size(); ++j) ~^~~~~~~~~~~~~ user.cpp:24:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("incurcatura.in","r",stdin); ^ user.cpp:25:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("incurcatura.out","w",stdout); ^ user.cpp:29:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&p,&n); ^ user.cpp:32:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:35:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^