Compilare: user.cpp: In function ‘int CBIN(long long int)’: user.cpp:9:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2 > x) ^ user.cpp:11:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(p2 < x) ^ user.cpp: In function ‘int main()’: user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2 * i >= a && p2 * i <= b){ ^ user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2 * i >= a && p2 * i <= b){ ^ user.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(p2 * i > b) ^ user.cpp:20:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.in", "r", stdin); ^ user.cpp:21:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.out", "w", stdout); ^ user.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &a, &b); ^