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RSS订阅原创 Week 15 Length of Last Word
问题概述 Given a string s consists of upper/lower-case alphabets and empty space characters ’ ', return the length of last word in the string. If the last word does not exist, return 0. Note: A word is de...
2018-12-27 21:48:42
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原创 Project
Capacitated Facility Location Problem问题描述Submission算法设计结果 问题描述 Suppose there are n facilities and m customers. We wish to choose: (1) which of the n facilities to open (2) the assignment of customers...
2018-12-26 20:09:12
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原创 Week 14 Min Stack
155.Min Stack 问题概述 Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) – Push element x onto stack. pop() – Removes the element on top of the sta...
2018-12-09 18:14:40
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原创 Week 13 Unique Paths
62.Unique Paths 问题概述 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 tr...
2018-12-02 19:07:40
126
原创 Week 12 Binary Tree Inorder Traversal
94.Binary Tree Inorder Traversal 问题概述 Given a binary tree, return the inorder traversal of its nodes’ values. Example Input: [1,null,2,3] 1 \ 2 / 3 Output: [1,3,2] 分析 二叉树遍历： 前序遍历：...
2018-11-25 21:02:28
100
原创 Week 11 Best Time to Buy and Sell Stock with Cooldown
309.Best Time to Buy and Sell Stock with Cooldown 问题概述 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 maximum profit. You may c...
2018-11-18 21:54:52
154
原创 Week 10 Minimum Path Sum
64. Minimum Path Sum 问题概述 Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. Note: You can only move ...
2018-11-11 20:34:53
123
原创 Week 9 Remove Duplicates From Sorted List
83. Remove Duplicates From Sorted List 问题概述 Given a sorted linked list, delete all duplicates such that each element appear only once. Example 1: Input: 1->1->2 Output: 1->2 Example 2: Input...
2018-11-04 18:41:32
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原创 Week 8 Remove Nth Node From End of List
19.Remove Nth Node From End of List 问题概述 Given a linked list, remove the n-th node from the end of list and return its head. Example: Given linked list: 1->2->3->4->5, and n = 2. After rem...
2018-10-28 18:36:52
121
原创 Week 7 Generate Parentheses
22. Generate Parentheses 问题概述 Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: [ “((()))”, “(()())”,...
2018-10-21 21:14:15
103
原创 Week 6 Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal 问题概述 Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the ...
2018-10-15 15:26:05
164
原创 Week 5 Count and Say
38. Count and Say 问题概述 The count-and-say sequence is the sequence of integers with the first five terms as following: 1. 1 2. 11 3. 21 4. 1211 5. 111221 1 is read off as “one 1” or 11 11 is read...
2018-10-13 23:11:19
104
翻译 Week 4 Regular Expression Matching
10.Regular Expression Matching 问题概述 Given an input string (s) and a pattern §, implement regular expression matching with support for ‘.’ and ‘*’. '.' Matches any single character. '*' Matches zero or...
2018-09-30 17:13:09
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原创 Week3 Same Tree
100.Same Tree 问题描述 题目来自LeetCode Depth-first Search Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally iden...
2018-09-28 17:11:37
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原创 week 2 Add Two Numbers
2. Add Two Numbers 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 ...
2018-09-15 21:33:33
128
原创 week 1 Search Insert Position
Search Insert Position 题目来自leetcode Array部分 Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order....
2018-09-08 11:34:48
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