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OJ-Problems-Source/.ACM-Templates/Data-Structures/suffix-automaton/remark.tex
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构建后缀自动机。统计一个串出现的次数时，只需统计其节点所对应的子树中，end为true的节点的个数即可。将所有节点按val值从小到大排序后即可得到parent树由根开始的BFS序。
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