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2024-07-23
面向前方
[USACO07MAR]FaceTheRightWayG题目描述FarmerJohnhasarrangedhisN(1≤N≤5,000)cowsinarowandmanyofthemarefacingforward,likegoodcows.Someofthemarefacingbackward,though,andheneedsthemalltofaceforwardtomakehislifeper