代码要点：倒序遍历，先算右侧再推左侧；栈内维护「右侧候选更大值」，单调递增（栈顶最小）。
In the following simplified trace generated by our workflow, a customer uses a 100% off promo code. The business logic calculates the total as $0.00 and attempts to pass it to the payment gateway, but the payment gateway rejects the API call because the minimum charge amount is $0.50, causing a 500 Internal Server Error:
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* @param arr 数组
tone: “gray-scale”
这里是国家级非遗——朱仙镇木版年画的活态传承基地。在这个被誉为“年画村”的地方，春节的热闹虽已过半，但属于赵庄人的“忙年”却远未结束。一张张红纸，正在这里演绎出一场关于乡村产业的静水深流。