题目描述 实现获取下一个排列的函数,算法需要将给定数字序列重新排列成字典序中下一个更大的排列. 如果不存在下一个更大的排列,则将数字重新排列成最小的排列(即升序排列). 必须原地修改,只允许使用额外常数空间. 以下是一些例子,输入位于左侧列,其相应输出位于右侧列. 1,2,3 → 1,3,2 3,2,1 → 1,2,3 1,1,5 → 1,5,1 解题思路 由于各个排列按照字典序排序,所以以 1,3,2 → 2,1,3为例,寻找下一个排列的步骤是: 首先找到从后往前第一个升序数对,在此例中即(1…

LeetCode 31 Next Permutation / 60 Permutation Sequence [Permutation] <c++> LeetCode 31 Next Permutation 给出一个序列,求其下一个排列 STL中有std::next_permutation这个方法可以直接拿来用 也可以写一个实现程序: 从右往左遍历序列,找到第一个nums[i-1]<num[i]的位置,记p = i-1. 如果第一步没有找到,说明整个序列满足单调递减,也就是最大的排列,那…

leetcode - 31. Next Permutation - Medium descrition Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible…

本文始发于个人公众号:TechFlow,原创不易,求个关注 今天我们讲的是LeetCode的31题,这是一道非常经典的问题,经常会在面试当中遇到.在今天的文章当中除了关于题目的分析和解答之外,我们还会详细解读深度优先搜索和回溯算法,感兴趣的同学不容错过. 链接 Next Permutation 难度 Medium 描述 实现C++当中经典的库函数next permutation,即下一个排列.如果把数组当中的元素看成字典序的话,那下一个排列即是字典序比当前增加1的排列.如果已经是字典序最大的情况…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1] are both considered valid, but the path [1,2,4,3] is not v…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

31. Next Permutation Problem's Link ---------------------------------------------------------------------------- Mean: 给定一个数列,求这个数列字典序的下一个排列. analyse: next_permutation函数的运用. Time complexity: O(N) view code class Solution{public:    void nextPermutati…

Next Permutation: Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending ord…

Next Permutation  Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending ord…