Solution2.java

class Solution {
    public long mostPoints(int[][] questions) {
        int n = questions.length;
        long[] f = new long[n + 1];
        for (int i = n - 1; i >= 0; --i) {
            int p = questions[i][0], b = questions[i][1];
            int j = i + b + 1;
            f[i] = Math.max(f[i + 1], p + (j > n ? 0 : f[j]));
        }
        return f[0];
    }
}