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jianchao_li

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热爱人工智能、机器学习和算法；截至2018年1月2日，LeetCode用户Most Reputation排名第2（https://discuss.leetcode.com/users?section=sort-reputation）

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发表了文章 2015-06-08

[LeetCode] Linked List Cycle II

Again, a classic interview question of linked list. Similar to Linked List Cycle, we maintain two pointers fast and slow: fast move two steps at one time while slow moves one step at a time.
发表了文章 2015-06-08

[LeetCode] Linked List Cycle

A classic interview question of linked list. The idea is to maintain two pointers, one move one step at a time and the other move two steps at a time.
发表了文章 2015-06-08

[LeetCode] Longest Palindromic Substring

This problem has a long story. There are just too many solutions on the web and it can be studied for a long time before you fully grasp it.
发表了文章 2015-06-08

[LeetCode] Rectangle Area

Well, this problem looks easy at first glance. However, to get a bug-free code may be not that easy. The total square is simply equal to the sum of t...
发表了文章 2015-06-07

[LeetCode] Longest Substring Without Repeating Characters

Well, there many ways to solve this problem. Let's first look at a naive solution. The basic idea is simple.
发表了文章 2015-06-07

[hihoCoder] 后序遍历

The key of this problem is that we need not build the tree from scratch. In fact, we can direct obtain its post-order traversal results in a recursive...
发表了文章 2015-06-07

[hihoCoder] Trie树

This is a application of the Trie data structure, with minor extension. The critical part in this problem is to count all the words that have a partic...
发表了文章 2015-06-07

[hihoCoder] 题外话·堆

A direct applicatin of the heap data structure. Specifically, a max heap is used. The required functions include insertion of a node to the heap and extraction of the maximum element of the heap.
发表了文章 2015-06-07

[LeetCode] Min Stack

The idea is to use two stacks. For push, the first stack records the pushed elements and the second stack records all the minimum (including duplicates) that have been seen.
发表了文章 2015-06-07

[LeetCode] Add and Search Word - Data Structure Design

This problem is an application of the Trie data structure. In the following, it is assumed that you have solved Implement Trie (Prefix Tree).
发表了文章 2015-06-06

[LeetCode] Implement strStr()

Well, the problem does not aim for an advanced algorithm like KMP but only a clean brute-force algorithm.
发表了文章 2015-06-06

[LeetCode] Divide Two Integers

In this problem, we are asked to divide two integers. However, we are not allowed to use division, multiplication and mod operations.
发表了文章 2015-06-05

[LeetCode] Read N Characters Given Read4

To read n characters, we first call read4 for n / 4 times. For example, if we want to read 10 characters, we will read them in the 8 (4 * 2) + 2 manne...
发表了文章 2015-06-05

[LeetCode] Two Sum III - Data Structure Design

Problem Description: Design and implement a TwoSum class. It should support the following operations: add and find.
发表了文章 2015-06-04

[Algorithms] Sorting Algorithms (Insertion Sort, Bubble Sort, Merge Sort and Quicksort)

Recently I systematicall review some sorting algorithms, including insertion sort, bubble sort, merge sort and quick sort.
发表了文章 2015-06-04

[Algorithms] Heap and Heapsort

Recently I reviewed the classic heapsort algorithm and implement it according to contents in Introduction to Algorithms (3rd edition).
发表了文章 2015-06-04

[LeetCode] Palindrome Partitioning

The problem has a nice structure that backtracking naturally fits in. The structure is, given a starting position idx, we search from idx till the end of the string s.
发表了文章 2015-06-03

[LeetCode] Maximal Square

Well, this problem desires for the use of dynamic programming. They key to any DP problem is to come up with the state equation.
发表了文章 2015-06-03

[LeetCode] Subsets

Recursive (Backtracking) This is a typical problem that can be tackled by backtracking. Since backtracking has a more-or-less similar template, so I do not give explanations for this method.
发表了文章 2015-06-03

[LeetCode] Best Time to Buy and Sell Stock II

This problem is similar to Best Time to Buy and Sell Stock. Given prices, we find the day (denoted as buy) of the first local minimum and the day (den...
发表了文章 2015-06-03

[LeetCode] Best Time to Buy and Sell Stock

This post shares a very simple solution, whose code is rewritten below, just 5 lines :-) 1 class Solution { 2 public: 3 int maxProfit(vect...
发表了文章 2015-06-02

[LeetCode] Flatten Binary Tree to Linked List

This problem seems to be tricky at first glance. However, if you know Morris traversal, it is just the preorder case of Morris traversal and the code is really short.
发表了文章 2015-06-02

[LeetCode] Sort List

There are many merge-sort solutions at the forum, but very few quicksort solutions. So I post my accepted quicksort solution here.
发表了文章 2015-06-02

[LeetCode] Minimum Path Sum

This is a typical DP problem. Suppose the minimum path sum of arriving at point (i, j) is S[i][j], then the state equation is S[i][j] = min(S[i - 1][j], S[i][j - 1]) + grid[i][j].
发表了文章 2015-06-02

[LeetCode] Unique Paths II

Well, this problem is similar to Unique Paths. The introduction of obstacles only changes the boundary conditions and make some points unreachable (simply set to 0).
发表了文章 2015-06-02

[LeetCode] Unique Paths

This is a fundamental DP problem. First of all, let's make some observations. Since the robot can only move right and down, when it arrives at a poin...
发表了文章 2015-06-02

[LeetCode] Kth Largest Element in an Array

Well, this problem has a naive solution, which is to sort the array in descending order and return the k-1-th element.
发表了文章 2015-06-02

[LeetCode] Binary Tree Level Order Traversal II

Well, I do not see what this problem is for. The same code of Binary Tree Level Order Traversal can be used here.
发表了文章 2015-06-02

[LeetCode] Binary Tree Level Order Traversal

A classic tree traversal problem. I share my two solutions here: BFS and DFS. BFS: 1 vector levelOrder(TreeNode *root) { 2 vector l...
发表了文章 2015-06-02

[LeetCode] Binary Tree Postorder Traversal

This is a fundamental and yet classic problem. I share my three solutions here: Iterative solution using stack --- O(n) time and O(n) space; Recurs...
发表了文章 2015-06-02

[LeetCode] Binary Tree Inorder Traversal

This is a fundamental and yet classic problem. I share my three solutions here: Iterative solution using stack --- O(n) time and O(n) space; Recurs...
发表了文章 2015-06-02

[LeetCode] Binary Tree Preorder Traversal

This is a fundamental and yet classic problem. I share my three solutions here: Iterative solution using stack --- O(n) time and O(n) space; Recurs...
发表了文章 2015-06-02

[LeetCode] Contains Duplicate II

Well, the basic idea is fairly straightforward. We maintain a mapping mp from a value in nums to its position (index) i.
发表了文章 2015-06-02

[LeetCode] Permutations II

Well, have you solved the nextPermutation problem? If so and you have handled the cases of duplicates at that problem, your code can be used in this problem.
发表了文章 2015-06-02

[LeetCode] Permutations

Well, have you solved the nextPermutation problem? If so, your code can be used in this problem. The idea is fairly simple: sort nums in ascending o...
发表了文章 2015-06-02

[LeetCode] Next Permutation

Well, in fact the problem of next permutation has been studied long ago. From the Wikipedia page, in the 14th century, a man named Narayana Pandita gi...

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发表了文章 2018-01-02

Jianchao's Blog is gonna to be moved to Yunqi
发表了文章 2016-09-10

[LeetCode] Sum of Two Integers
发表了文章 2016-08-14

[LeetCode] Ransom Note
发表了文章 2015-12-03

[LeetCode] Sparse Matrix Multiplication
发表了文章 2015-11-23

[LeetCode] Range Sum Query - Mutable
发表了文章 2015-11-20

[LeetCode] Additive Number
发表了文章 2015-11-14

[LeetCode] Number of Islands II
发表了文章 2015-11-12

[LeetCode] Range Sum Query 2D - Immutable
发表了文章 2015-11-10

[LeetCode] Range Sum Query - Immutable
发表了文章 2015-11-08

[LeetCode] Smallest Rectangle Enclosing Black Pixels
发表了文章 2015-11-05

[LeetCode] Remove Invalid Parentheses
发表了文章 2015-11-03

[LeetCode] Longest Increasing Subsequence
发表了文章 2015-10-31

[LeetCode] Bulls and Cows
发表了文章 2015-10-30

[LeetCode] Binary Tree Longest Consecutive Sequence
发表了文章 2015-10-30

[LeetCode] Serialize and Deserialize Binary Tree
发表了文章 2015-10-22

[LeetCode] Best Meeting Point
发表了文章 2015-10-19

[LeetCode] Find Median from Data Stream
发表了文章 2015-10-17

[LeetCode] Flip Game II
发表了文章 2015-10-15

[LeetCode] Flip Game
发表了文章 2015-10-13

[LeetCode] Nim Game

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jianchao_li_个人页

个人介绍

擅长的技术

[LeetCode] Linked List Cycle II

[LeetCode] Linked List Cycle

[LeetCode] Longest Palindromic Substring

[LeetCode] Rectangle Area

[LeetCode] Longest Substring Without Repeating Characters

[hihoCoder] 后序遍历

[hihoCoder] Trie树

[hihoCoder] 题外话&#183;堆

[LeetCode] Min Stack

[LeetCode] Add and Search Word - Data Structure Design

[LeetCode] Implement strStr()

[LeetCode] Divide Two Integers

[LeetCode] Read N Characters Given Read4

[LeetCode] Two Sum III - Data Structure Design

[Algorithms] Sorting Algorithms (Insertion Sort, Bubble Sort, Merge Sort and Quicksort)

[Algorithms] Heap and Heapsort

[LeetCode] Palindrome Partitioning

[LeetCode] Maximal Square

[LeetCode] Subsets

[LeetCode] Best Time to Buy and Sell Stock II

[LeetCode] Best Time to Buy and Sell Stock

[LeetCode] Flatten Binary Tree to Linked List

[LeetCode] Sort List

[LeetCode] Minimum Path Sum

[LeetCode] Unique Paths II

[LeetCode] Unique Paths

[LeetCode] Kth Largest Element in an Array

[LeetCode] Binary Tree Level Order Traversal II

[LeetCode] Binary Tree Level Order Traversal

[LeetCode] Binary Tree Postorder Traversal

[LeetCode] Binary Tree Inorder Traversal

[LeetCode] Binary Tree Preorder Traversal

[LeetCode] Contains Duplicate II

[LeetCode] Permutations II

[LeetCode] Permutations

[LeetCode] Next Permutation

Jianchao&#39;s Blog is gonna to be moved to Yunqi

[LeetCode] Sum of Two Integers

[LeetCode] Ransom Note

[LeetCode] Sparse Matrix Multiplication

[LeetCode] Range Sum Query - Mutable

[LeetCode] Additive Number

[LeetCode] Number of Islands II

[LeetCode] Range Sum Query 2D - Immutable

[LeetCode] Range Sum Query - Immutable

[LeetCode] Smallest Rectangle Enclosing Black Pixels

[LeetCode] Remove Invalid Parentheses

[LeetCode] Longest Increasing Subsequence

[LeetCode] Bulls and Cows

[LeetCode] Binary Tree Longest Consecutive Sequence

[LeetCode] Serialize and Deserialize Binary Tree

[LeetCode] Best Meeting Point

[LeetCode] Find Median from Data Stream

[LeetCode] Flip Game II

[LeetCode] Flip Game

[LeetCode] Nim Game

[hihoCoder] 题外话·堆

Jianchao's Blog is gonna to be moved to Yunqi