const stack = []; // 单调递增栈：栈底→栈顶数字递增，保证高位尽可能小
Hard difficulty hints, answers for Feb. 27 PipsNumber (6): Everything in this space must add up to 6. The answer is 4-0, placed horizontally; 2-6, placed vertically.
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输入：temperatures = [73,74,75,71,69,72,76,73]
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