3847. Find the Score Difference in a Game

You are given an integer array nums, where nums[i] represents the points scored in the i^th game.

There are exactlytwo players. Initially, the first player is active and the second player is inactive.

The following rules apply sequentially for each game i:

• If nums[i] is odd, the active and inactive players swap roles.
• In every 6th game (that is, game indices 5, 11, 17, ...), the active and inactive players swap roles.
• The active player plays the i^th game and gains nums[i] points.

Return the score difference, defined as the first player’s total score minus the second player’s total score.

class Solution {
public:
    int scoreDifference(vector<int>& nums) {
        int score[2]{0,0}, run = 0;
        for(int i = 0, game = 1; i < nums.size(); i++, game++) {
            if(nums[i] & 1) run = !run;
            if(game % 6 == 0) run = !run;
            score[run] += nums[i];
        }
        return score[0] - score[1];
    }
};