There is a garden with N slots. In each slot, there is a flower. The N flowers will bloom one by one in N days. In each day, there will be exactly one flower blooming and it will be in the status of blooming since then. Given an array flowers consist…

There is a garden with N slots. In each slot, there is a flower. The N flowers will bloom one by one in N days. In each day, there will be exactly one flower blooming and it will be in the status of blooming since then. Given an array flowers consist…

There is a garden with N slots. In each slot, there is a flower. The N flowers will bloom one by one in Ndays. In each day, there will be exactly one flower blooming and it will be in the status of blooming since then. Given an array flowers consists…

There is a garden with N slots. In each slot, there is a flower. The N flowers will bloom one by one in N days. In each day, there will be exactly one flower blooming and it will be in the status of blooming since then. Given an array flowers consist…

We are given a binary tree (with root node root), a target node, and an integer value K. Return a list of the values of all nodes that have a distance K from the target node.  The answer can be returned in any order. Example 1: Input: root = [3,5,1,6…

乘风破浪:LeetCode真题_023_Merge k Sorted Lists 一.前言 上次我们学过了合并两个链表,这次我们要合并N个链表要怎么做呢,最先想到的就是转换成2个链表合并的问题,然后解决,再优化一点的,就是两个两个合并,当然我们也可以一次性比较所有的元素,然后一点点的进行合并等等. 二.Merge k Sorted Lists 2.1 问题 2.2 分析与解决 首先我们看看官方的解法: 第一种方法:暴力算法,将所有的元素放到一个数组里面,排序之后再用指针链接. # Definit…

Given a non-empty string str and an integer k, rearrange the string such that the same characters are at least distance k from each other. All input strings are given in lowercase letters. If it is not possible to rearrange the string, return an empt…

转自  http://tech-wonderland.net/blog/summary-of-ksum-problems.html 前言: 做过leetcode的人都知道, 里面有2sum, 3sum(closest), 4sum等问题, 这些也是面试里面经典的问题, 考察是否能够合理利用排序这个性质, 一步一步得到高效的算法. 经过总结, 本人觉得这些问题都可以使用一个通用的K sum求和问题加以概括消化, 这里我们先直接给出K Sum的问题描述和算法(递归解法), 然后将这个一般性的方法套用…

题目链接:https://leetcode.com/problems/subarrays-with-k-different-integers/ 题意:已知一个全为正数的数组A,1<=A.length<=20000,1<=A[i]<=A.length,1<=K<=A.length,问A中恰好有K个不同的元素的子数组个数有多少个 思路:对于考虑到数据范围较大,暴力显然不可取.对于每个位置i,如果用min_k[i] 表示起始位置为i的子数组存在k个元素的最小结束位置,用min…

Given a non-empty list of words, return the k most frequent elements. Your answer should be sorted by frequency from highest to lowest. If two words have the same frequency, then the word with the lower alphabetical order comes first. Example 1: Inpu…