Leetcode 链接:leetcode.com/problems/k 我们可以先预先分配好一个大小为k的小顶堆,接着一次将输入数组中的元素依次放入heap当中,但heap的大小超过k时,则代表我们已经找到了目前输入数据中的最大的K+1个数,这个时候,我们需要将最小的元素(既堆顶元素)移除堆中。最后我们的堆中留存的就是最大的k个数。堆顶元素就是
LeetCode108.将有序数组转换为二叉搜索树 题目来源: https://leetcode-cn.com/problems/convert-sorted-array-to-binary-search-tree/ 题目描述: 代码如下:智能推荐Python heap 原文:https://blog.csdn.net/dta0502/article/details/80834787 堆是一类特殊的树,堆的通用特点就是父节点会大于或小于所有子节点(...
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Leetcode Unique Paths Java Solution A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘...
Bellman-Ford算法原理及练习 || LeetCode 787 3、SPFA的简单练习 练习一: 题目链接:hihoCoder 时间限制:10000ms单点时限:1000ms内存限制:256MB 描述万圣节的晚上,小Hi和小Ho在吃过晚饭之后,来到了一个巨大的鬼屋!鬼屋中一共有N个地点,分别编号为1..N,这N个地点之间互相有一些道路连通,两个地点之间可能有多...
原题地址:https://oj.leetcode.com/problems/merge-k-sorted-lists/ 题意:Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity. 解题思路: 归并k个已经排好序的链表, 使用堆这一数据结构. 堆,也叫做:priority queue ...
Data structures in Java java stack queue trie data-structures heap linkedlist bst arraylist Updated on Oct 13, 2020 Java anishLearnsToCode / hackerrank-data-structures Star 6 Code Issues Pull requests Data Structures 👩💻 Domain on HackerRank - Problems & Solutions 📑📘 java ...
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堆排序虽然叫heap sort,但是和内存上的那个heap并没有实际关系。算法上,堆排序一般使用数组的形式来实现,即binary heap。 我们可以将堆排序所使用的堆int[] heap视为一个完全二叉树,即,除非最后一层右侧有空结点,其他都为满结点。 对于任意heap[i]有如下一些性质: ...
https://leetcode.com/problems/lru-cache/discuss/45926/Python-Dict-%2B-Double-LinkedList 就是用一个双向链表存顺序,dict来存内容 Use LinkedList + Hashmap Doubly LinkedList Store current node in value in hash map Current.prev.next = current.next ...