You are given a 0-indexed 2D integer array questions where questions[i] = [pointsi, brainpoweri].
The array describes the questions of an exam, where you have to process the questions in order (i.e., starting from question 0) and make a decision whether to solve or skip each question. Solving question i will earn you pointsi points but you will be unable to solve each of the next brainpoweri questions. If you skip question i, you get to make the decision on the next question.
questions = [[3, 2], [4, 3], [4, 4], [2, 5]]:\n\n\t0 is solved, you will earn 3 points but you will be unable to solve questions 1 and 2.0 is skipped and question 1 is solved, you will earn 4 points but you will be unable to solve questions 2 and 3.Return the maximum points you can earn for the exam.
\n\n\n
Example 1:
\n\n\nInput: questions = [[3,2],[4,3],[4,4],[2,5]]\nOutput: 5\nExplanation: The maximum points can be earned by solving questions 0 and 3.\n- Solve question 0: Earn 3 points, will be unable to solve the next 2 questions\n- Unable to solve questions 1 and 2\n- Solve question 3: Earn 2 points\nTotal points earned: 3 + 2 = 5. There is no other way to earn 5 or more points.\n\n\n
Example 2:
\n\n\nInput: questions = [[1,1],[2,2],[3,3],[4,4],[5,5]]\nOutput: 7\nExplanation: The maximum points can be earned by solving questions 1 and 4.\n- Skip question 0\n- Solve question 1: Earn 2 points, will be unable to solve the next 2 questions\n- Unable to solve questions 2 and 3\n- Solve question 4: Earn 5 points\nTotal points earned: 2 + 5 = 7. There is no other way to earn 7 or more points.\n\n\n
\n
Constraints:
\n\n1 <= questions.length <= 105questions[i].length == 21 <= pointsi, brainpoweri <= 105给你一个下标从 0 开始的二维整数数组 questions ，其中 questions[i] = [pointsi, brainpoweri] 。
这个数组表示一场考试里的一系列题目，你需要 按顺序 （也就是从问题 0 开始依次解决），针对每个问题选择 解决 或者 跳过 操作。解决问题 i 将让你 获得 pointsi 的分数，但是你将 无法 解决接下来的 brainpoweri 个问题（即只能跳过接下来的 brainpoweri 个问题）。如果你跳过问题 i ，你可以对下一个问题决定使用哪种操作。
questions = [[3, 2], [4, 3], [4, 4], [2, 5]] ：\n\n\t0 被解决了， 那么你可以获得 3 分，但你不能解决问题 1 和 2 。0 ，且解决问题 1 ，你将获得 4 分但是不能解决问题 2 和 3 。请你返回这场考试里你能获得的 最高 分数。
\n\n\n\n
示例 1：
\n\n输入：questions = [[3,2],[4,3],[4,4],[2,5]]\n输出：5\n解释：解决问题 0 和 3 得到最高分。\n- 解决问题 0 ：获得 3 分，但接下来 2 个问题都不能解决。\n- 不能解决问题 1 和 2\n- 解决问题 3 ：获得 2 分\n总得分为：3 + 2 = 5 。没有别的办法获得 5 分或者多于 5 分。\n\n\n
示例 2：
\n\n输入：questions = [[1,1],[2,2],[3,3],[4,4],[5,5]]\n输出：7\n解释：解决问题 1 和 4 得到最高分。\n- 跳过问题 0\n- 解决问题 1 ：获得 2 分，但接下来 2 个问题都不能解决。\n- 不能解决问题 2 和 3\n- 解决问题 4 ：获得 5 分\n总得分为：2 + 5 = 7 。没有别的办法获得 7 分或者多于 7 分。\n\n\n
\n\n
提示：
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