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leetcode 20. Valid Parentheses Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets

反转链表 206 4/20/2020 Reverse Linked List - Easy 地址： https://leetcode.com/problems/reverse-linked-list/ 题目描述 Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head = [1,2,3,4,5] Output: [5,4,3,2,1]

力扣704 - Binary Search 二分查找 题目描述 Given an array of integers nums which is sorted in ascending order, and an integer target, write a function to search target in nums. If target exists, then return its index. Otherwise, return -1. Example 1: Input: nums = [

力扣 62. Unique Paths-不同路径（Python版本） 题目描述 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 corne

力扣70. Climbing Stairs 爬楼梯 题目描述 You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 假设你正在爬楼梯。需要 n 阶你才能到达楼顶。 每次你可以爬 1 或 2 个台阶。你有多少种不同的方法可以爬到楼顶呢？ Ex

力扣66. 加一 （Python版本，两解题思路） 题目描述 Given a non-empty array of decimal digits representing a non-negative integer, increment one to the integer. The digits are stored such that the most significant digit is at the head of the list, and each element in the arra

Leetcode 1. Two Sum 两数之和 (python) 题目 Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same ele

力扣 160 - Intersection of Two Linked Lists. (相交链表) Python双指针 https://leetcode.com/problems/intersection-of-two-linked-lists/ Given the heads of two singly linked-lists headA and headB, return the node at which the two lists intersect. If the two linked lis