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原创算法分析与设计课程（19）：【leetcode】Ugly Number II

Description:Write a program to find the n-th ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12 is the sequ

2017-07-04 22:25:18 260

原创第八章课后题答案

8.1. Optimization versus search. Recall the traveling salesman problem:TSPInput: A matrix of distances; a budget bOutput: A tour which passes through all the cities and has length ≤ b, ifsuc

2017-07-01 15:02:18 1068

原创算法分析与设计课程（18）：【leetcode】Clone Graph

Description:Clone an undirected graph. Each node in the graph contains a label and a list of its neighbours.OJ’s undirected graph serialization: Nodes are labeled uniquely.We use # as a separato

2017-06-27 16:22:46 278

原创算法分析与设计课程（17）：【leetcode】4Sum

Description:Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target.

2017-06-16 17:00:40 230

原创算法分析与设计课程（16）：【leetcode】 Integer to Roman

Description:Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.Subscribe to see which companies asked this question.算法分析：

2017-06-11 19:47:36 250

原创算法分析与设计课程（15）：【leetcode】 Find Minimum in Rotated Sorted Array

Description:Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).Find the minimum element.

2017-06-05 15:57:08 222

原创算法分析与设计课程（14）：【leetcode】 Maximal Square

Description:Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area.For example, given the following matrix:1 0 1 0 01 0 1 1 11

2017-05-25 15:20:45 258

原创算法分析与设计课程（13）：【leetcode】 Product of Array Except Self

Description:Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i].Solve it without d

2017-05-19 14:16:55 288

原创算法分析与设计课程（12）：【leetcode】 Count Complete Tree Nodes

Description:Given a complete binary tree, count the number of nodes.Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly the last, is comp

2017-05-13 16:06:30 344

原创算法分析与设计课程（11）：【leetcode】Gray Code

Description:The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integer n representing the total number of bits in the code, prin

2017-05-04 15:54:44 318

原创算法分析与设计课程（10）：【leetcode】Simplify Path

Description:Given an absolute path for a file (Unix-style), simplify it.For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c"click to show corner cases.算法分析：

2017-04-30 16:23:46 236

原创算法分析与设计课程（9）：【leetcode】Jump Game

Description: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

2017-04-23 19:55:00 256

原创算法分析与设计课程（8）：【leetcode】Sudoku Solver

Description:Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may assume that there will be only one unique solution.

2017-04-14 09:15:49 310

原创算法分析与设计课程（7）：【leetcode】Reverse Nodes in k-Group

Description:Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.k is a positive integer and is less than or equal to the length of the linked lis

2017-04-07 14:57:33 281

原创算法分析与设计课程（6）：【leetcode】Sudoku

Description:The Sudoku board could be partially filled, where empty cells are filled with the character'.'.A partially filled sudoku which is valid.Note:A valid Sudoku board (partially

2017-03-30 11:18:41 303

原创算法分析与设计课程（5）：【leetcode】Search for a Range

Description:Given an array of integers sorted in ascending order, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the order of O(

2017-03-26 12:03:44 259

原创算法分析与设计课程（4）：【leetcode】Wildcard Matching

Description:Implement wildcard pattern matching with support for '?' and '*'.'?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence).The match

2017-03-17 15:44:27 270

原创算法分析与设计课程（3）：【leetcode】Permutations

PermutationsDescription:Given a collection of distinct numbers, return all possible permutations.For example,[1,2,3] have the following permutations:算法分析：解决这个问题，很容易想到树，一层层地生成。

2017-03-09 18:20:23 239

原创算法分析与设计课程（2）：Letter Combinations of a Phone Number

Description:Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below.Inpu

2017-03-03 15:41:55 216

原创算法分析与设计课程（1）：Add Two Numbers

Description:You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numb

2017-02-26 18:03:20 383