Compilare: user.cpp: In function ‘int main()’: user.cpp:26:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>c) ^ user.cpp:29:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>b) ^ user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>a) ^ user.cpp:7:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%llu%llu%llu",&n,&a,&b,&c),n-=3; ^ user.cpp:7:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:7:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:25:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^