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终于A了

Posted by lddlinan at 2020-05-12 22:32:16 on Problem 1602
解码的时候,遍历字符集, 尝试以当前字符结尾,根据位置关系依次计算出前一字符, 直到算出能满足所有位置关系和起始位置的n个字符

复杂度 m*n m为可用字符集的大小

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