题意:给定 4n * 2 个坐标,分成 n组,让你判断,点绕点的最少次数使得四个点是一个正方形的顶点. 析:那么就一个一个的判断,n 很小,不会超时,四个点分别从不转然后转一次,转两次...转四次,就这样算下去,那么如何判断是不是正方形呢?这样判定就行,把每个边都求出来,然后判定, 这里肯定有四个边是一样,另外两个是一样的,而且还不是0,因为可能重合,关键是旋转后怎么算呢?有两个公式,假设点(x, y)绕点(a, b)转 x 角度,那么旋转后的坐标为 (xx, yy),应该是, xx = (x…

题目链接:点击打开链接 题意: 给定T表示case数 以下4行是一个case 每行2个点,u v 每次u能够绕着v逆时针转90° 问最少操作多少次使得4个u构成一个正方形. 思路: 枚举判可行 #include <iostream> #include <cmath> #include <algorithm> #include <cstdio> using namespace std; int hah,ijj; int haifei; template <…

4*4*4*4暴力+点的旋转+推断正方型 C. Captain Marmot time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Captain Marmot wants to prepare a huge and important battle against his enemy, Captain Snake. For this…

C. Captain Marmot time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Captain Marmot wants to prepare a huge and important battle against his enemy, Captain Snake. For this battle he has n regi…

C. Captain Marmot time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Captain Marmot wants to prepare a huge and important battle against his enemy, Captain Snake. For this battle he has n regi…

题目链接:http://codeforces.com/contest/474/problem/C 解题报告:给一个n,然后输入4*n个平面坐标系上的点,每四个点是一组,每个点有一个中心,这四个点可以分别围绕这个中心旋转,每次只能逆时针转90度,现在问你要使这四个点形成一个正方形最少要转的次数是多少. 枚举这四个点转的次数分别为0,1,2,3,只要这四种,因为再转的话就回到原来的状态循环了.然后对于每种情况分别判断是不是组成正方形就可以了,关键是求旋转后的坐标,和判断是不是正方形的问题. 假设这个…

题意:给你x%ci=bi(x未知),是否能确定x%k的值(k已知) ——数学相关知识: 首先:我们知道一些事情,对于k,假设有ci%k==0,那么一定能确定x%k的值,比如k=5和ci=20,知道x%20=y,那么ans=x%k=y%5; 介绍(互质版)中国剩余定理,假设已知m1,m2,mn,两两互质,且又知道x%m1,x%m2..x%mn分别等于多少 设M=m1*m2*m3..mn,那么x在模M的剩余系下只有唯一解(也就是知道了上面的模线性方程组,就可以求出x%M等于多少) ——此题解法 针对…

M. Variable Shadowing Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100513/problem/M Description In computer programming, variable shadowing occurs when a variable declared within a certain scope has the same name as a variab…

G. FacePalm Accounting Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100513/problem/G Description An owner of a small company FacePalm has recently learned that the city authorities plan to offer to small businesses to partic…

"Cricket Field" Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100002 Description Once upon a time there was a greedy King who ordered his chief Architect to build a field for royal cricket inside his park. The King was so…