for (int i = 1; i < range; i++) {
栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。
// 解释：第一个有效数字不能是0，栈空时存0无意义，直接跳过，详情可参考safew官方下载
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better: as a consumer-facing device, ATMs became part of the brand image of the
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