The firm also beat analyst's forecasts as sales for the last three months of its financial year jumped by 73% compared to 12 months earlier.
思路：链表转数组 + 单调栈（从后往前遍历）。与「下一个更大元素」模板一致，仅需将链表值先提取到数组。
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- 父节点i的左子: 2*i+1, 右子: 2*i+2
candidate.weight /= sum of weights