permutation Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 141 Accepted Submission(s): 81 Problem Description Permutation plays a very important role in Combinatorics. For example ,1 2 3 4…
Problem Description Permutation plays a very important role in Combinatorics. For example ,1 2 3 4 5 and 1 3 5 4 2 are both 5-permutations. As everyone's known, the number of n-permutations is n!. According to their magnitude relatives ,if we insert…
Permutation Bo 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5753 Description There are two sequences h1∼hn and c1∼cn. h1∼hn is a permutation of 1∼n. particularly, h0=hn+1=0. We define the expression [condition] is 1 when condition is True,is 0 whe…
Permutation Bo 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5753 Description There are two sequences h1∼hn and c1∼cn. h1∼hn is a permutation of 1∼n. particularly, h0=hn+1=0. We define the expression [condition] is 1 when condition is True,is 0 whe…
题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=3811 Permutation Time Limit: 6000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) 问题描述 In combinatorics a permutation of a set S with N elements is a listing of the elements of S in some…
2019 杭电多校 5 1005 题目链接:HDU 6628 比赛链接:2019 Multi-University Training Contest 5 Problem Description A sequence of length \(n\) is called a permutation if and only if it's composed of the first \(n\) positive integers and each number appears exactly once…
Permutation Problem Description There is an arrangement of N numbers and a permutation relation that alter one arrangement into another.For example, when N equals to 6 the arrangement is 123456 at first. The replacement relation is 312546 (indicate 1…
这里是一个比较简单的问题:考虑每个数对和的贡献.先考虑数列两端的值,两端的摆放的值总计有2种,比如左端:0,大,小:0,小,大:有1/2的贡献度.右端同理. 中间的书总计有6种可能.小,中,大.其中有两种对答案有贡献,即1/3的贡献度.加和计算可得到答案. Permutation Bo Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s):…
题目链接 Problem Description As to a permutation p1,p2,⋯,pn from 1 to n, it is uncomplicated for each 1≤i≤n to calculate (li,ri) meeting the condition that min(pL,pL+1,⋯,pR)=pi if and only if li≤L≤i≤R≤ri for each 1≤L≤R≤n. Given the positive integers n, (…
