CodeForces 297C Splitting the Uniqueness (脑补构造题)

【CodeForces 297C Splitting the Uniqueness (脑补构造题)】的更多相关文章

CodeForces 297C Splitting the Uniqueness (脑补构造题)

题意 Split a unique array into two almost unique arrays. unique arrays指数组各个数均不相同,almost unique arrays指可以删掉数后再判断. 思路略神的数学构造题... 官方题解: An equivalent definition for almost unique, is arrays with at least ⌊ 2n / 3⌋ different elements. The idea is to split…

Codeforces 297C. Splitting the Uniqueness

C. Splitting the Uniqueness time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Polar bears like unique arrays — that is, arrays without repeated elements. You have got a unique array s with le…

Codeforces.297C.Splitting the Uniqueness(构造)

题目链接 \(Description\) 给定一个长为n的序列A,求两个长为n的序列B,C,对任意的i满足B[i]+C[i]=A[i],且B,C序列分别至少有\(\lfloor\frac{2*n}{3}\rfloor\)个元素不同. A中元素各不相同,Ai,Bi,Ci均为非负整数. \(Solution\) 取\(k=\lfloor\frac{n}{3}\rfloor\),将B,C序列分成三份.可以先将A进行排序. B序列1~k取0~k-1,C序列k+1~2k取k~2k-1,C 2k+1~n取0…

CodeForces 297D Color the Carpet (脑补题)

题意一个h*w的矩阵上面涂k种颜色,并且每行相邻格子.每列相邻格子都有=或者!=的约束.要求构造一种涂色方案使得至少有3/4的条件满足. 思路脑补神题--自己肯定想不出来T_T-- 官方题解: 297D - Color the Carpet This is my favorite problem in the contest :) For k = 1 there is only one coloring so we just need to check the number of "E&qu…

Educational Codeforces Round 7 D. Optimal Number Permutation 构造题

D. Optimal Number Permutation 题目连接: http://www.codeforces.com/contest/622/problem/D Description You have array a that contains all integers from 1 to n twice. You can arbitrary permute any numbers in a. Let number i be in positions xi, yi (xi < yi) i…

Codeforces Gym 100342H Problem H. Hard Test 构造题，卡迪杰斯特拉

Problem H. Hard TestTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100342/attachments Description Andrew is having a hard time preparing his 239-th contest for Petrozavodsk. This time the solution to the problem is based on Di…