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线段树定义区间树，就是最终节点是距离为一的区间的线段树，然后，离散化的是海报贴上去的区间，因为给的是瓷砖编号，所以对应的区间就是两侧瓷砖的缝，就是两边的黑线 Followed by: Post your reply here: |
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