LeetCode - Super Pow

class Solution {
public:
    int superPow(int a, vector<int>& b) {
        int md =  1337;
       
        a%=md;
        int len = b.size();
       
        int fu = a;
        int ans = 1;
       
        for(int i = len - 1; i >= 0 ; i --){
            int k = 1;
            for(int j = 1 ; j <=10 ; j ++){
                k = k * fu;
                k %= md;
                if(j == b[i]){
                    ans *= k;
                    ans %= md;
                }
            }
            fu = k;
        }
        return ans;
    }
};