首先,中心点是能够直接算出来的 把全部的坐标相加再除n就能够 然后枚举一个不靠近中心的点,枚举它绕中心点旋转的角度.仅仅要枚举50次就能够了 计算出当前枚举的的角度能否形成一个置换群 计算循环节,再用polya定理算个数 #pragma comment(linker, "/STACK:102400000,102400000") #include<iostream> #include<vector> #include<algorithm> #inclu…

传送门 对于错想成lis的解法,提供一组反例 1 3 4 2 5同时对于这次案例也可以观察出解法:对于每一个数,如果存在比它小的数在它后面,它势必需要移动,因为只能小的数无法向右移动,而且每一次移动都必然可以使得这个数到达正确位置,这是根据题意而得的 #include<queue> #include<cmath> #include<cstdio> #include<cstring> #include<cstdlib> #include<io…

题目传送门 设dp[i][j]为杀掉区间i到j之间的狼需要付出的最小代价,那么dp[i][j]=min{dp[i][k-1]+dp[k+1][j]+a[k]+b[i-1]+b[j+1]} Java代码 import java.io.*; import java.util.*; class MyInputStream extends InputStream { public BufferedInputStream bis = new BufferedInputStream(System.in);…

Here N (N ≥ 3) rabbits are playing by the river. They are playing on a number line, each occupying a different integer. In a single move, one of the outer rabbits jumps into a space between any other two. At no point may two rabbits occupy the same p…

/* 鞍山区域赛的K题..当时比赛都没来得及看(反正看了也不会) 学了polya定理之后就赶紧跑来补这个题.. 由于几何比较烂写了又丑又长的代码,还debug了很久.. 比较感动的是竟然1Y了.. */ 题目大意: 给定一些点,某些点上有边,问用k种颜色染色的等价类有多少种 思路: 由于坐标是整数..只有可能旋转90,180,270才能得到置换 且图形必须为中心对称图形 先用几何方法找出对称中心 然后旋转,找是否出现置换... 由于点数只有50,几何预处理这一部分可以很暴力无脑的写..各种判断相…

周六周末组队训练赛. Dogs' Candies Time Limit: 30000/30000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others)Total Submission(s): 3920    Accepted Submission(s): 941 Problem Description Far far away, there live a lot of dogs in the forest. Unlike…

HDU 4041 Eliminate Witches! (模拟题 ACM ICPC 2011 亚洲北京赛区网络赛题目) Eliminate Witches! Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 863    Accepted Submission(s): 342 Problem Description Kaname Mado…

Song Jiang's rank list Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others)Total Submission(s): 2006    Accepted Submission(s): 1128 Problem Description <Shui Hu Zhuan>,also <Water Margin>was written by Shi Nai…

Little Zu Chongzhi's Triangles Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others)Total Submission(s): 2515    Accepted Submission(s): 1427 Problem Description Zu Chongzhi (429–500) was a prominent Chinese mathematic…

Different Circle Permutation Time Limit: 3000/1500 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 218    Accepted Submission(s): 106 Problem Description You may not know this but it's a fact that Xinghai Square is…