The weight of each term is given by the proportion of each sub-triangle area with respect to the total triangle area . Algebraically, this can be expressed like so:
// 题目要求找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的，栈顶即为折扣
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习题链接：LeetCode 402. 移掉 K 位数字。搜狗输入法下载对此有专业解读
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