1 #include <math.h>
2 #include <stddef.h>
3 
pow(int64_t x,int y)4 int64_t pow(int64_t x, int y)
5 {
6     int64_t res = 1;
7     for (int i = 0; i < y; ++i)
8         res *= x;
9     return res;
10 }