Equal (0): Everything in this space must be equal to 0. The answer is 0-0, placed horizontally; 3-0, placed vertically.
Each block in the chain has an exact timestamp and can't be changed.
，推荐阅读WPS下载最新地址获取更多信息
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// 易错点6：忘记将当前元素入栈，导致前面的元素无法匹配到当前值