P1607 [USACO09FEB]庙会班车Fair Shuttle 题目描述 Although Farmer John has no problems walking around the fair to collect prizes or see the shows, his cows are not in such good shape; a full day of walking around the fair leaves them exhausted. To help them en…

P1607 [USACO09FEB]庙会班车Fair Shuttle 题目描述 Although Farmer John has no problems walking around the fair to collect prizes or see the shows, his cows are not in such good shape; a full day of walking around the fair leaves them exhausted. To help them en…

    不是很容易写出正解的贪心问题. 题目描述 Although Farmer John has no problems walking around the fair to collect prizes or see the shows, his cows are not in such good shape; a full day of walking around the fair leaves them exhausted. To help them enjoy the fair, F…

题面 题目描述 逛逛集市,兑兑奖品,看看节目对农夫约翰来说不算什么,可是他的奶牛们非常缺乏锻炼--如果要逛完一整天的集市,他们一定会筋疲力尽的.所以为了让奶牛们也能愉快地逛集市,约翰准备让奶牛们在集市上以车代步.但是,约翰木有钱,他租来的班车只能在集市上沿直线跑一次,而且只能停靠N(1 ≤N≤20000)个地点(所有地点都以1到N之间的一个数字来表示).现在奶牛们分成K(1≤K≤50000)个小组,第i 组有Mi(1 ≤Mi≤N)头奶牛,他们希望从Si跑到Ti(1 ≤Si<Ti≤N). 由于班车…

题目描述 逛逛集市,兑兑奖品,看看节目对农夫约翰来说不算什么,可是他的奶牛们非常缺乏锻炼——如果要逛完一整天的集市,他们一定会筋疲力尽的.所以为了让奶牛们也能愉快地逛集市,约翰准备让奶牛们在集市上以车代步.但是,约翰木有钱,他租来的班车只能在集市上沿直线跑一次,而且只能停靠N(1 ≤N≤20000)个地点(所有地点都以1到N之间的一个数字来表示).现在奶牛们分成K(1≤K≤50000)个小组,第i 组有Mi(1 ≤Mi≤N)头奶牛,他们希望从Si跑到Ti(1 ≤Si<Ti≤N). 由于班车容量有…

Description 逛逛集市,兑兑奖品,看看节目对农夫约翰来说不算什么,可是他的奶牛们非常缺乏锻炼--如果要逛完一整天的集市,他们一定会筋疲力尽的.所以为了让奶牛们也能愉快地逛集市,约翰准备让奶牛们在集市上以车代步.但是,约翰木有钱,他租来的班车只能在集市上沿直线跑一次,而且只能停靠N(1 ≤N≤20000)个地点(所有地点都以1到N之间的一个数字来表示).现在奶牛们分成K(1≤K≤50000)个小组,第i 组有Mi(1 ≤Mi≤N)头奶牛,他们希望从Si跑到Ti(1 ≤Si<Ti≤N).…

题目描述 Although Farmer John has no problems walking around the fair to collect prizes or see the shows, his cows are not in such good shape; a full day of walking around the fair leaves them exhausted. To help them enjoy the fair, FJ has arranged for a…

题目描述 Although Farmer John has no problems walking around the fair to collect prizes or see the shows, his cows are not in such good shape; a full day of walking around the fair leaves them exhausted. To help them enjoy the fair, FJ has arranged for a…

P2939 [USACO09FEB]改造路Revamping Trails 题目描述 Farmer John dutifully checks on the cows every day. He traverses some of the M (1 <= M <= 50,000) trails conveniently numbered 1..M from pasture 1 all the way out to pasture N (a journey which is always pos…

题意翻译 约翰一共有\(N\))个牧场.由\(M\)条布满尘埃的小径连接.小径可 以双向通行.每天早上约翰从牧场\(1\)出发到牧场\(N\)去给奶牛检查身体. 通过每条小径都需要消耗一定的时间.约翰打算升级其中\(K\)条小径,使之成为高 速公路.在高速公路上的通行几乎是瞬间完成的,所以高速公路的通行时间为\(0\). 请帮助约翰决定对哪些小径进行升级,使他每天从\(1\)号牧场到第\(N\)号牧场所花的时间最短 题目描述 Farmer John dutifully checks on the…