Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 275  Solved: 175[Submit][Status][Discuss] Description Bessie the cow is a huge fan of card games, which is quite surprising, given her lack of opposable thumbs. Unfortunately, none of the other cows in…

bzoj4396[Usaco2015 dec]High Card Wins 题意: 一共有2n张牌,Alice有n张,Bob有n张,每一局点数大的赢.知道Bob的出牌顺序,求Alice最多能赢几局.n≤50000. 题解: 贪心.将Alice和Bob的牌按点数大小排序,然后如果Alice当前牌能赢Bob当前牌就ans++否则就不断调整Bob的当前牌直到Alice当前牌能赢Bob当前牌. 代码: #include <cstdio> #include <cstring> #includ…

[BZOJ4391][Usaco2015 dec]High Card Low Card(贪心) 题面 BZOJ 题解 预处理前缀后缀的结果,中间找个地方合并就好了. #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<algorithm> #include<set> using na…

Description Bessie the cow is a huge fan of card games, which is quite surprising, given her lack of opposable thumbs. Unfortunately, none of the other cows in the herd are good opponents. They are so bad, in fact, that they always play in a complete…

Description Bessie the cow is a huge fan of card games, which is quite surprising, given her lack of opposable thumbs. Unfortunately, none of the other cows in the herd are good opponents. They are so bad, in fact, that they always play in a complete…

巧妙的贪心 Description Bessie the cow is a huge fan of card games, which is quite surprising, given her lack of opposable thumbs. Unfortunately, none of the other cows in the herd are good opponents. They are so bad, in fact, that they always play in a co…

---题面--- 题解: 观察到以决策点为分界线,以点数大的赢为比较方式的游戏都是它的前缀,反之以点数小的赢为比较方式的都是它的后缀,也就是答案是由两段答案拼凑起来的. 如果不考虑判断胜负的条件的变化,则有一个比较容易发现的贪心: 设f[i]为从1开始到i位, 比较方式为点数大的获胜,最多能赢几局. 那么为了使答案尽可能优,每次我们都会在剩余牌中找到点数大于对方的 最小的牌,然后出掉. 同理,设g[i]为从n开始到i位,比较方式为点数小的获胜,最多能赢几局, 则每次都在剩余牌中选择点数小于对方的…

传送门 分析 神奇的贪心,令f[i]表示前i个每次都出比对方稍微大一点的牌最多能赢几次 g[i]表示从i-n中每次出比对方稍微小一点的牌最多赢几次 ans=max(f[i]+g[i+1]) 0<=i<=n 虽然方案可能会重合但是这是可行的 1:因为限制比原题目宽,所以ans>=真实的答案 2:对于重复取的数a,如果集合中有个没取的数<a,那么在用小的赢的时候可以代替a 如果>a,那么在用大的赢时可以代替a 用set来记录最接近的数 代码 #include<bits/st…

4390: [Usaco2015 dec]Max Flow Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 177  Solved: 113[Submit][Status][Discuss] Description Farmer John has installed a new system of N−1 pipes to transport milk between the N stalls in his barn (2≤N≤50,000), c…

4397: [Usaco2015 dec]Breed Counting Time Limit: 10 Sec  Memory Limit: 128 MB Description Farmer John's N cows, conveniently numbered 1…N, are all standing in a row (they seem to do so often that it now takes very little prompting from Farmer John to…