原创 Unique Binary Search Trees
Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given n =
2020-02-22 07:31:00
原创 Restore IP Addresses
Given a string containing only digits, restore it by returning all possible valid IP address combinations. For exa
2020-02-22 07:31:00
原创 Search for a Range
Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's
2020-02-22 07:31:00
原创 Palindrome Number
Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could
2020-02-22 07:31:00
原创 Next Permutation
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of number
2020-02-22 07:31:00
原创 Combination Sum
Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate nu
2020-02-22 07:31:00
原创 Evaluate Reverse Polish Notation
Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each o
2020-02-22 07:31:00
原创 Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level b
2020-02-22 07:31:00
原创 Sum Root to Leaf Numbers
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example
2020-02-22 07:31:00
原创 Letter Combinations of a Phone Number
Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit
2020-02-22 07:30:50
原创 N-Queens II
Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct
2020-02-22 07:30:50
原创 Spiral Matrix II
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Give
2020-02-22 07:30:50
原创 Word Search
Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequ
2020-02-22 07:30:50
原创 Simplify Path
Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b
2020-02-22 07:30:50
原创 原型鏈
前言 雖然接觸了很久的javascript，但是總感覺自己對js的prototype理解不到位。剛好今天在公司的所有活都做完了，就抽空把自己整理的筆記記錄下來（有很多是從網上的例子，自己動手操作加深理解）。 首先需要了解js的幾個概念
2018-08-25 10:30:24