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UVA - 1485 Permutation Counting
Description Given a permutation a1, a2,...aN of {1, 2,..., N}, we define its E-value as the amount of elements where ai > i. For example, the E-value of permutation {1, 3, 2, 4} is 1, while th...
分类:其他好文   时间:2014-08-23 16:54:31    阅读次数:232
白话 STL next_permutation 原理
翻译自stackoverflow英语好的同学可以自己去看一下。什么是next permutation 下面是四个元素{1,2,3,4}的排列1 2 3 41 2 4 31 3 2 41 3 4 21 4 2 31 4 3 22 1 3 4... 每一行都是一个排列。 我们如何从一个排列转到下一...
分类:其他好文   时间:2014-08-21 17:01:44    阅读次数:228
【Leetcode】Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl...
分类:其他好文   时间:2014-08-20 14:06:22    阅读次数:163
POJ 3187 Backward Digit Sums(next_permutation)
Description FJ and his cows enjoy playing a mental game. They write down the numbers from 1 to N (1 <= N <= 10) in a certain order and then sum adjacent numbers to produce a new list with one fewer...
分类:其他好文   时间:2014-08-20 10:33:36    阅读次数:256
每日算法之四十二:Permutation Sequence (顺序排列第k个序列)
The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): "123""132""213""231""3...
分类:其他好文   时间:2014-08-19 22:34:25    阅读次数:288
LeetCode "Permutation Sequence"
1A! This is actually a basic question in Combinatorics: if at digit[k] = n, it contributes (k-1)! * n to the targeted index.class Solution {public: .....
分类:其他好文   时间:2014-08-19 14:22:04    阅读次数:169
Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl...
分类:其他好文   时间:2014-08-19 00:57:53    阅读次数:213
STL-next permutation
过程:从右往左,找到第一个A[i] A[i], j > i;交换A[i] 与 A[j];将A[j+1]之后的元素逆序。代码: 1 class Solution { 2 public: 3 void nextPermutation(vector &num) { 4 if(nu...
分类:其他好文   时间:2014-08-19 00:48:53    阅读次数:248
[LeetCode] Permutation Sequence
The set [1,2,3,…,n] contains a total of n! unique permutations.By listing and labeling all of the permutations in order, We get the following sequence...
分类:其他好文   时间:2014-08-18 23:29:23    阅读次数:207
C++构造 下一个排列 的函数
今天围观刘汝佳神犇的白书发现了一个好用的函数:next_permutation();可以用于可重, 或者不可重集, 寻找下一个排列.时间复杂度尚不明.//适用于不可重和可重集的排列.# include # include using namespace std;int a[1003], n;int ...
分类:编程语言   时间:2014-08-15 17:21:09    阅读次数:222
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