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SPOJ 422 Transposing is Even More Fun(polay計數)
時間 2020-12-30
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題目鏈接:http://www.spoj.com/problems/TRANSP2/ 題意: 思路:不妨設a=1,b=2, 我們發現(001,010,100)組成一個置換,(011,110,101)組成一個置換。那麼對於同一個置換中元素,設置換大小爲x,則需要x-1次交換。因此,我們若找到循環節的個數K,那麼答案即爲2^(a+b)-K. a+b個珠子的項鍊,每個珠子可以用兩種顏色塗色,通過每次左移
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