1.普通数组找两个数,哈希表建立数值和下标的映射,遍历时一边判断一边添加 /* 哇,LeetCode的第一题...啧啧 */ public int [] twoSum(int[] nums, int target) { /* 两个数配合组成target 建立值和下标的映射,遍历数组时一边判断是否有另一半,一边添加新映射到哈希表 */ Map<Integer,Integer> map = new HashMap<>(); for (int i = 0; i < nums.len…

package org.lep.leetcode.twosum; import java.util.Arrays; import java.util.HashMap; import java.util.Map; /** * source:https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/#/description * Created by lverpeng on 2017/6/21. * * Given an array…

LeetCode--single-number系列 Question 1 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? Soluti…

Leetcode算法系列(链表)之删除链表倒数第N个节点 难度:中等给定一个链表,删除链表的倒数第 n 个节点,并且返回链表的头结点.示例:给定一个链表: 1->2->3->4->5, 和 n = 2.当删除了倒数第二个节点后,链表变为 1->2->3->5.说明:给定的 n 保证是有效的.链接:https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list Python实现 # Definiti…

Leetcode算法系列(链表)之两数相加 难度:中等给出两个 非空 的链表用来表示两个非负的整数.其中,它们各自的位数是按照 逆序 的方式存储的,并且它们的每个节点只能存储 一位 数字.如果,我们将这两个数相加起来,则会返回一个新的链表来表示它们的和.您可以假设除了数字 0 之外,这两个数都不会以 0 开头.示例:输入:(2 -> 4 -> 3) + (5 -> 6 -> 4)输出:7 -> 0 -> 8原因:342 + 465 = 807 链接:https://le…

Sum 系列题解 Two Sum题解 题目来源:https://leetcode.com/problems/two-sum/description/ Description Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one sol…

题目:Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). For example,S = "ADOBECODEBANC"T = "ABC" Minimum window is "BANC". Note:If there is no such windo…

LeetCode 两数之和 给定一个整数数组,返回两个数字的索引,使它们相加到特定目标. 您可以假设每个输入只有一个解决方案,并且您可能不会两次使用相同的元素. 更多文章查看个人博客 个人博客地址:twoSum 两数之和 [JAVA实现] 方法一 使用双重循环两两相加判断是否等于目标值 public List<String> twoSum2(int[] arr, int sum) { if (arr == null || arr.length == 0) { return new ArrayL…

题目: Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Your goal is to reach the last index in the minimum number of j…

题目:Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is. You may not alter the values in the nodes, only…