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\begin {array}{c} \mathfrak {One Problem Is Difficult} \\\\ \mathfrak {Because You Don't Know} \\\\ \mathfrak {Why It Is Diffucult} \end {array}

P4331 [BalticOI 2004]Sequence 数字序列

P4331 [BalticOI 2004]Sequence 数字序列

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