HDU 2019 Multi-University Training Contest 1 杭電2019多校聯合訓練賽 第一場 1001 Blank (6578)

HDU 2019 Multi-University Training Contest 1 杭電2019暑期多校集訓第一場 1001 Blank (6578) Problem Description There are N blanks arranged in a row. The blanks are numbered 1,2,…,N from left to right. Tom is fill
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