int int_pown(unsigned int base, unsigned int exp);
unsigned long long ull_pown(unsigned int base, unsigned int exp);
int int_logn(unsigned int base, unsigned int a);
int int_pow10(unsigned int exp);
int int_floor(int x, int precision);
int int_ceil(int x, int precision);
int int_max(int a, int b);
int int_min(int a, int b);