BZOJ_3049_[Usaco2013 Jan]Island Travels _状压DP+BFS Description Farmer John has taken the cows to a vacation out on the ocean! The cows are living on N (1 <= N <= 15) islands, which are located on an R x C grid (1 <= R, C <= 50). An island is a…

Description Farmer John has taken the cows to a vacation out on the ocean! The cows are living on N (1 <= N <= 15) islands, which are located on an R x C grid (1 <= R, C <= 50). An island is a maximal connected group of squares on the grid tha…

3048: [Usaco2013 Jan]Cow Lineup Time Limit: 2 Sec  Memory Limit: 128 MBSubmit: 237  Solved: 168[Submit][Status][Discuss] Description Farmer John's N cows (1 <= N <= 100,000) are lined up in a row. Each cow is identified by an integer "breed ID&…

3048: [Usaco2013 Jan]Cow Lineup Time Limit: 2 Sec  Memory Limit: 128 MBSubmit: 225  Solved: 159[Submit][Status][Discuss] Description Farmer John's N cows (1 <= N <= 100,000) are lined up in a row. Each cow is identified by an integer "breed ID&…

BZOJ_3048_[Usaco2013 Jan]Cow Lineup _双指针 Description Farmer John's N cows (1 <= N <= 100,000) are lined up in a row. Each cow is identified by an integer "breed ID" in the range 0...1,000,000,000; the breed ID of the ith cow in the lineup…

P3070 [USACO13JAN]岛游记Island Travels 题目描述 Farmer John has taken the cows to a vacation out on the ocean! The cows are living on N (1 <= N <= 15) islands, which are located on an R x C grid (1 <= R, C <= 50). An island is a maximal connected gro…

[bzoj 3048] [Usaco2013 Jan]Cow Lineup Description 给你一个长度为n(1<=n<=100,000)的自然数数列,其中每一个数都小于等于10亿,现在给你一个k,表示你最多可以删去k类数.数列中相同的数字被称为一类数.设该数列中满足所有的数字相等的连续子序列被叫做完美序列,你的任务就是通过删数使得该数列中的最长完美序列尽量长. Input Line 1: Two space-separated integers: N and K. Lines 2..…

这是今天下午的互测题,只得了60多分 分析一下错因: $dis[i][j]$只记录了相邻的两个岛屿之间的距离,我一开始以为可以,后来$charge$提醒我有可能会出现来回走的情况,而状压转移就一次,无法实现来回走的情况,所以加了一个类似$floyed算法$的三重循环来更新每个点的距离,然后状态转移就可以了,枚举起点和终点,最后统计答案 #include<cstdio> #include<cstring> #include<algorithm> using namespa…

题目描述 Farmer John has taken the cows to a vacation out on the ocean! The cows are living on N (1 <= N <= 15) islands, which are located on an R x C grid (1 <= R, C <= 50). An island is a maximal connected group of squares on the grid that are m…

线段树维护4个标记, 昨天互测时题意理解错了,今天上午才发现. #include<cstdio> #include<cstring> #include<algorithm> #define N 500003 using namespace std; int sum[N*3], n, m, ans = 0, lazy[N*3],left[N*3],right[N*3],whole[N*3]; inline void buildtree(int l, int r, int…