class Solution {
/*
* @param a, b, n: 32bit integers
* @return: An integer
*/
public int fastPower(int a, int b, int n) {
if (n == 1) {
return a % b;
}
if (n == 0) {
return 1 % b;
}
long product = fastPower(a, b, n / 2);
product = product * product % b;
if (n % 2 == 1) {
product = (product * a) % b;
}
return (int) product;
}
};