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Educational Codeforces Round 73 (Rated for Div. 2) D. Make The Fence Great Again(DP)
時間 2020-07-21
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題意: 給出一排木板的高度和將這些木板提高1個高度的代價。問使這些木板達到沒有相鄰的兩塊木板相等的狀況的最小代價。html 思路: 二維DP 本題關鍵:對於每一塊木板,最多提升兩次。ios 若是一個木板提升了三次才和兩邊的木板高度不等,那麼提升兩次必定和某個木塊相等,同理也有一個木塊等於提升一個的長度。那麼這個木塊就乾脆不提升就行,這與提升三次矛盾。web 因此能夠得出最多提升兩次的結論。app
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