Greed is Good

• Time : $O(|dice|)$
• Space : $O(1)$

#include <bits/stdc++.h>
using namespace std;
int score(const std::vector<int>& dice) {
    unordered_map<int, int> freq;
    int res = 0;
    for(auto d : dice) {
        if(++freq[d] == 3) {
            freq[d] = 0;
            if(d == 1) res += 1000;
            else res += d * 100;
        }
    }
    res += 100 * freq[1];
    res += 50 * freq[5];
    return res;
}