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Leetcode:Permutations II
Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2]have the following unique perm...
分类:其他好文   时间:2015-01-13 15:40:23    阅读次数:169
CodeForces 501D Misha and Permutations Summation
题意: n(2*10^5)个元素的排列有n!种  用Perm(x)表示字典序第x的序列(从0开始)  用Ord(排列y)表示排列y的字典序  现在输入排列p和q  求  Perm([Ord(p)+Ord(q)]%n!) 思路: 容易想到  对于第i位p[i]  如果它是第d小的数字  那么说明比它小的d-1个数字所产生的全排列都已经计数过了 例子  35142  第4位是4  它是第2小的...
分类:其他好文   时间:2015-01-12 22:36:35    阅读次数:234
Codeforces Round #285 (Div.1 B & Div.2 D) Misha and Permutations Summation --二分+树状数组
题意:给出两个排列,求出每个排列在全排列的排行,相加,模上n!(全排列个数)得出一个数k,求出排行为k的排列。解法:首先要得出定位方法,即知道某个排列是第几个排列。比如(0,?1,?2),?(0,?2,?1),?(1,?0,?2),?(1,?2,?0),?(2,?0,?1),?(2,?1,?0).拿...
分类:编程语言   时间:2015-01-12 20:53:54    阅读次数:202
CF501D Misha and Permutations Summation(康托展开)
以前写康托展开都是直接O(n^2),碰到了一定要nlogn的,存个代码。#pragma warning(disable:4996)#include #include #include #include #include #include #include using namespace std;#d...
分类:其他好文   时间:2015-01-12 20:51:54    阅读次数:195
Leetcode:Permutations
Given a collection of numbers, return all possible permutations.For example,[1,2,3]have the following permutations:[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,...
分类:其他好文   时间:2015-01-12 17:31:04    阅读次数:164
【leetcode】Permutations II
Permutations IIGiven a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2]have the follow...
分类:其他好文   时间:2015-01-10 17:51:39    阅读次数:272
【leetcode】 Permutation Sequence (middle)
The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence (ie...
分类:其他好文   时间:2015-01-05 21:54:01    阅读次数:194
【leetcode】Permutations (middle)
Given a collection of numbers, return all possible permutations.For example,[1,2,3]have the following permutations:[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,...
分类:其他好文   时间:2015-01-05 21:52:03    阅读次数:210
[LeetCode]93 Restore IP Addresses
https://oj.leetcode.com/problems/restore-ip-addresses/http://blog.csdn.net/linhuanmars/article/details/24683699publicclassSolution{ publicList<String>restoreIpAddresses(Strings) { if(s==null||s.length()<4) returnCollections.emptyList();//invalidinp..
分类:其他好文   时间:2015-01-05 18:59:09    阅读次数:155
[LeetCode]77 Combinations
https://oj.leetcode.com/problems/combinations/http://blog.csdn.net/linhuanmars/article/details/21260217publicclassSolution{ publicList<List<Integer>>combine(intn,intk) { List<List<Integer>>results=newArrayList<>(); help(n,k,0,n..
分类:其他好文   时间:2015-01-04 19:34:42    阅读次数:125
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