原创 [Leetcode]Remove Invalid Parentheses
Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.
2020-06-15 09:26:54
原创 [Leetcode]Binary Tree Postorder Traversal
Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3},
2020-06-15 09:26:44
原创 [Leetcode]Simplify Path
Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b/../.
2020-06-15 09:26:44
原创 [cc150]Chapter 3 | Stacks and Queues
3.1Describe how you could use a single array to implement three stacks. 1)solution 1 divide the array to 3 part, so e
2020-06-15 09:26:44
原创 [Leetcode]Longest Substring Without Repeating Characters
Given a string, find the length of the longest substring without repeating characters. For example, the longest substri
2020-02-22 10:07:44
原创 [Leetcode]Serialize and Deserialize Binary Tree
Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored
2020-02-22 10:07:44
原创 [Leetcode]Longest Consecutive Sequence
Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [
2020-02-22 10:07:44
原创 [Leetcode]N-Queens II
Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solut
2020-02-22 10:07:44
原创 [Leetcode]Range Sum Query - Immutable
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nu
2020-02-22 10:07:43
原创 [Leetcode]Find the Duplicate Number
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least on
2020-02-22 10:07:43
原创 [Leetcode]N-Queens
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.
2020-02-22 10:07:43
原创 [Leetcode]Divide Two Integers
Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT. class
2020-02-22 10:07:43
原创 [Leetcode]Additive Number
Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least
2020-02-22 10:07:43
原创 [Leetcode]Spiral Matrix
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example, G
2020-02-22 10:07:43
原创 [Leetcode]Odd Even Linked List
Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking ab
2020-02-22 10:07:33