传送门 题意: 给出一个圆,圆上有\(n\)个点,依次为\(0,1,\cdots,n-1\). 现在要连接\(m\)对点,每次连接时可以直接从里面连,也可以从外面连. 最后问,连完这\(m\)对点后,是否有线相交. 思路: 每次连接时可以直接从里面连,也可以从外面连,那么可以考虑这个问题是一个\(2-sat\)模型.\(2-sat\)模型一般可以表示为:\((x_1\bigvee x_2)\bigwedge (x_3\bigvee x_4)\bigwedge \cdots\).大概就是这样,每个…

POJ 3207 Ikki's Story IV - Panda's Trick liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game with Ikki. liympanda…

POJ 3207 Ikki's Story IV - Panda's Trick(2-sat问题) Description liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many times, he is tired of such easy games and wants to play another game…

Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 6691   Accepted: 2496 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many tim…

http://poj.org/problem?id=3207 Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 7021   Accepted: 2604 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping wi…

Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 7296   Accepted: 2705 Description liympanda, one of Ikki’s friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so many tim…

Ikki's Story IV - Panda's Trick Time Limit: 1000MS   Memory Limit: 131072KB   64bit IO Format: %I64d & %I64u Submit Status Description liympanda, one of Ikki's friend, likes playing games with Ikki. Today after minesweeping with Ikki and winning so m…

[Luogu4921]情侣?给我烧了!(组合计数) 题面 洛谷 题解 很有意思的一道题目. 直接容斥?怎么样都要一个平方复杂度了. 既然是恰好\(k\)对,那么我们直接来做: 首先枚举\(k\)对人出来\(\displaystyle {n\choose k}\),然后枚\(k\)排座位出来\(\displaystyle {n\choose k}\),这些人间的顺序关系\(k!\),然后这些人可以左右交换\(2^{k}\). 好的,现在的问题转化为了剩下\(n-k\)对人,两两之间不能坐在一排,求…

[BZOJ4991]我也不知道题目名字是什么(线段树) 题面 BZOJ 题解 对于线段树维护的区间维护以下东西: 区间左(右)端开始(结束)的最长(短)子串的长度 左端右端的值,以及当前区间内的答案 每次向上合并只需要分类讨论即可 #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<algorithm…

[python]Leetcode每日一题-直方图的水量(接雨水) [题目描述] 给定一个直方图(也称柱状图),假设有人从上面源源不断地倒水,最后直方图能存多少水量?直方图的宽度为 1. 上面是由数组 [0,1,0,2,1,0,1,3,2,1,2,1] 表示的直方图,在这种情况下,可以接 6 个单位的水(蓝色部分表示水). 感谢 Marcos 贡献此图. 示例1: 输入: [0,1,0,2,1,0,1,3,2,1,2,1] 输出: 6 [分析] 思路 填满水坑的图像是左右非完全单调递增的,由此可以…