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RSS订阅原创 [leetcode][python]63. Unique Paths II
63. Unique Paths II 知识点：dynamic programming 1. 原题 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 ...
2020-04-12 06:10:17
302
原创 [leetcode][python]147. Insertion Sort List
147. Insertion Sort List 知识点：sort 1. 原题 Sort a linked list using insertion sort. A graphical example of insertion sort. The partial sorted list (black) initially contains only the first element in t...
2020-04-12 05:49:09
312
原创 [leetcode][python] 62. Unique Paths
62. Unique Paths 知识点：dynamic programming 1. 原题 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 poi...
2020-04-11 03:47:28
323
原创 [leetcode][python] 3. Longest Substring Without Repeating Characters
3. Longest Substring Without Repeating Characters 知识点：two pointers 1. 原题 Given a string, find the length of the longest substring without repeating characters. Example 1: Input: “abcabcbb” Output: 3 ...
2020-04-11 02:55:15
364
原创 [leetcode][python] 457. Circular Array Loop
457. Circular Array Loop 知识点：two pointers 1. 原题 You are given a circular array nums of positive and negative integers. If a number k at an index is positive, then move forward k steps. Conversely, if...
2020-03-30 07:39:57
367
原创 [leetcode][python] 424. Longest Repeating Character Replacement
424. Longest Repeating Character Replacement 知识点： two pointers | sliding window 1. 原题 Given a string s that consists of only uppercase English letters, you can perform at most k operations on that st...
2020-03-30 07:19:49
352
原创 [leetcode][python] 74. Search a 2D Matrix
74. Search a 2D Matrix 知识点：binary search 1.原题 Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from...
2020-03-30 03:25:48
173
原创 [leetcode][python] 287. Find the Duplicate Number
287. Find the Duplicate Number 知识点：two pointers 1. 原题 Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must ex...
2020-03-29 11:06:55
310
原创 [Leetcode][python]209. Minimum Size Subarray Sum
209. Minimum Size Subarray Sum 知识点：two pointers 1.原题 Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there is...
2020-03-29 10:02:38
202
原创 [leetcode][python]142. Linked List Cycle II
142. Linked List Cycle II 知识点：two pointers 1. 原题 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. To represent a cycle in the given linked list, we use ...
2020-03-29 09:01:57
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原创 [Leetcode][python]150. Evaluate Reverse Polish Notation
150. Evaluate Reverse Polish Notation 知识点：stack 1. 原题 Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or anot...
2020-03-28 05:47:39
290
原创 [Leetcode][python] 144. Binary Tree Preorder Traversal
144. Binary Tree Preorder Traversal 知识点：slack 1.原题 Given a binary tree, return the preorder traversal of its nodes’ values. Example: Input: [1,null,2,3] 1 \ 2 / 3 Output: [1,2,3] ...
2020-03-28 04:38:29
222
原创 [leetcode][python] 103. Binary Tree Zigzag Level Order Traversal
103. Binary Tree Zigzag Level Order Traversal 知识点：slack 1. 原题 Given a binary tree, return the zigzag level order traversal of its nodes’ values. (ie, from left to right, then right to left for the ne...
2020-03-28 02:47:06
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