Maximum Points You Can Obtain from Cards

class Solution {
public:
    int maxScore(vector<int>& cardPoints, int k) {
        int total = 0, windowSum = 0, n = cardPoints.size();
        for(int i = 0;i<n;i++){
            if(i<n-k)windowSum+=cardPoints[i];
            total+=cardPoints[i];
        }
        int maxi = total-windowSum,j = 0;
        for(int i = n-k;i<n;i++){
            windowSum+=cardPoints[i];
            windowSum-=cardPoints[j++];
            maxi = fmax(maxi, total-windowSum);
        }
        return maxi;
    }
};

// Question Link:-https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/