原创 LeetCode - Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once. For example, given 1->1->2,

2020-06-18 23:33:12

原创 LeetCode - Single Number

Given an array of integers, every element appears twice except for one. Find that single one.Note: Your algorithm shoul

2020-02-23 13:37:10

原创 LeetCode - Best Time to Buy and Sell Stock II

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the

2020-02-23 13:37:10

原创 LeetCode - Reverse Integer

Reverse digits of an integer. Example1: x = 123, return 321; x = -123, return -321 http://oj.leetcode.com/problems/reve

2020-02-23 13:37:10

原创 LeetCode - Populating Next Right Pointers in Each Node

Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode

2020-02-23 13:37:10

原创 LeetCode - Same Tree

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if th

2020-02-23 13:37:10

原创 LeetCode - Linked List Cycle

Given a linked list, determine if it has a cycle in it. http://oj.leetcode.com/problems/linked-list-cycle/ Solution: V

2020-02-23 13:37:10

原创 LeetCode - Gray Code

The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integ

2018-09-02 10:27:58

原创 LeetCode - Permutations

Given a collection of numbers, return all possible permutations. For example, [1,2,3] have the following permutations:

2018-09-02 10:27:58

原创 LeetCode - Best Time to Buy and Sell Stock

Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to c

2018-09-02 10:27:58

原创 LeetCode - Merge Sorted Array

Given two sorted integer arrays A and B, merge B into A as one sorted array. Note:  You may assume that A has enough sp

2018-09-02 10:27:57

原创 LeetCode - Symmetric Tree

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary

2018-09-02 10:27:57

原创 LeetCode - Balanced Binary Tree

Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tre

2018-09-02 10:27:57

原创 LeetCode - Swap Nodes in Pairs

Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should retur

2018-09-02 10:27:57

原创 LeetCode - Climbing Stairs

You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In ho

2018-09-02 10:27:57 3