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#1. Two Sum

#1. Two Sum

 
 

#100. Same Tree

#100. Same Tree

 
 

#101. Symmetric Tree

#101. Symmetric Tree

 
 

#102. Binary Tree Level Order Traversal

#102. Binary Tree Level Order Traversal

 
 

#1021. Remove Outermost Parentheses

#1021. Remove Outermost Parentheses

 
 

#104. Maximum Depth of Binary Tree

#104. Maximum Depth of Binary Tree

 
 

#1047. Remove All Adjacent Duplicates In String

#1047. Remove All Adjacent Duplicates In String

 
 

#108. Convert Sorted Array to Binary Search Tree

#108. Convert Sorted Array to Binary Search Tree

 
 

#109. Convert Sorted List to Binary Search Tree

#109. Convert Sorted List to Binary Search Tree

 
 

#11. Container With Most Water

#11. Container With Most Water

 
 

#110. Balanced Binary Tree

#110. Balanced Binary Tree

 
 

#1108. Defanging an IP Address

#1108. Defanging an IP Address

 
 

#111. Minimum Depth of Binary Tree

#111. Minimum Depth of Binary Tree

 
 

#1123. Lowest Common Ancestor of Deepest Leaves

#1123. Lowest Common Ancestor of Deepest Leaves

 
 

#114. Flatten Binary Tree to Linked List

#114. Flatten Binary Tree to Linked List

 
 

#1207. Unique Number of Occurrences

#1207. Unique Number of Occurrences

 
 

#121. Best Time to Buy and Sell Stock

#121. Best Time to Buy and Sell Stock

 
 

#1221. Split a String in Balanced Strings

#1221. Split a String in Balanced Strings

 
 

#124. Binary Tree Maximum Path Sum

#124. Binary Tree Maximum Path Sum

 
 

#125. Valid Palindrome

#125. Valid Palindrome

 
 

#1281. Subtract the Product and Sum of Digits of an Integer

#1281. Subtract the Product and Sum of Digits of an Integer

 
 

#129. Sum Root to Leaf Numbers

#129. Sum Root to Leaf Numbers

 
 

#1290. Convert Binary Number in a Linked List to Integer

#1290. Convert Binary Number in a Linked List to Integer

 
 

#1295. Find Numbers with Even Number of Digits

#1295. Find Numbers with Even Number of Digits

 
 

#1299. Replace Elements with Greatest Element on Right Side

#1299. Replace Elements with Greatest Element on Right Side

 
 

#1302. Deepest Leaves Sum

#1302. Deepest Leaves Sum

 
 

#1305. All Elements in Two Binary Search Trees

#1305. All Elements in Two Binary Search Trees

 
 

#1309. Decrypt String from Alphabet to Integer Mapping

#1309. Decrypt String from Alphabet to Integer Mapping

 
 

#1315. Sum of Nodes with Even-Valued Grandparent

#1315. Sum of Nodes with Even-Valued Grandparent

 
 

#1323. Maximum 69 Number

#1323. Maximum 69 Number

 
 

#1332. Remove Palindromic Subsequences

#1332. Remove Palindromic Subsequences

 
 

#1342. Number of Steps to Reduce a Number to Zero

#1342. Number of Steps to Reduce a Number to Zero

 
 

#136. Single Number

#136. Single Number

 
 

#137. Single Number II

#137. Single Number II

 
 

#1374. Generate a String With Characters That Have Odd Counts

#1374. Generate a String With Characters That Have Odd Counts

 
 

#1381. Design a Stack With Increment Operation

#1381. Design a Stack With Increment Operation

 
 

#14. Longest Common Prefix

#14. Longest Common Prefix

 
 

#141. Linked List Cycle

#141. Linked List Cycle

 
 

#1436. Destination City

#1436. Destination City

 
 

#144. Binary Tree Preorder Traversal

#144. Binary Tree Preorder Traversal

 
 

#1441. Build an Array With Stack Operations

#1441. Build an Array With Stack Operations

 
 

#1448. Count Good Nodes in Binary Tree

#1448. Count Good Nodes in Binary Tree

 
 

#145. Binary Tree Postorder Traversal

#145. Binary Tree Postorder Traversal

 
 

#1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence

#1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence

 
 

#1464. Maximum Product of Two Elements in an Array

#1464. Maximum Product of Two Elements in an Array

 
 

#1470. Shuffle the Array

#1470. Shuffle the Array

 
 

#1480. Running Sum of 1d Array

#1480. Running Sum of 1d Array

 
 

#1486. XOR Operation in an Array

#1486. XOR Operation in an Array

 
 

#1491. Average Salary Excluding the Minimum and Maximum Salary

#1491. Average Salary Excluding the Minimum and Maximum Salary

 
 

#1502. Can Make Arithmetic Progression From Sequence

#1502. Can Make Arithmetic Progression From Sequence

 
 

#151. Reverse Words in a String

#151. Reverse Words in a String

 
 

#1512. Number of Good Pairs

#1512. Number of Good Pairs

 
 

#1518. Water Bottles

#1518. Water Bottles

 
 

#1528. Shuffle String

#1528. Shuffle String

 
 

#1544. Make The String Great

#1544. Make The String Great

 
 

#155. Min Stack

#155. Min Stack

 
 

#1557. Minimum Number of Vertices to Reach All Nodes

#1557. Minimum Number of Vertices to Reach All Nodes

 
 

#160. Intersection of Two Linked Lists

#160. Intersection of Two Linked Lists

 
 

#165. Compare Version Numbers

#165. Compare Version Numbers

 
 

#167. Two Sum II - Input array is sorted

#167. Two Sum II - Input array is sorted

 
 

#169. Majority Element

#169. Majority Element

 
 

#173. Binary Search Tree Iterator

#173. Binary Search Tree Iterator

 
 

#182. Duplicate Emails

#182. Duplicate Emails

 
 

#183. Customers Who Never Order

#183. Customers Who Never Order

 
 

#19. Remove Nth Node From End of List

#19. Remove Nth Node From End of List

 
 

#191. Number of 1 Bits

#191. Number of 1 Bits

 
 

#196. Delete Duplicate Emails

#196. Delete Duplicate Emails

 
 

#198. House Robber

#198. House Robber

 
 

#199. Binary Tree Right Side View

#199. Binary Tree Right Side View

 
 

#2. Add Two Numbers

#2. Add Two Numbers

 
 

#20. Valid Parentheses

#20. Valid Parentheses

 
 

#203. Remove Linked List Elements

#203. Remove Linked List Elements

 
 

#206. Reverse Linked List

#206. Reverse Linked List

 
 

#21. Merge Two Sorted Lists

#21. Merge Two Sorted Lists

 
 

#217. Contains Duplicate

#217. Contains Duplicate

 
 

#22. Generate Parentheses

#22. Generate Parentheses

 
 

#222. Count Complete Tree Nodes

#222. Count Complete Tree Nodes

 
 

#225. Implement Stack using Queues

#225. Implement Stack using Queues

 
 

#226. Invert Binary Tree

#226. Invert Binary Tree

 
 

#230. Kth Smallest Element in a BST

#230. Kth Smallest Element in a BST

 
 

#232. Implement Queue using Stacks

#232. Implement Queue using Stacks

 
 

#234. Palindrome Linked List

#234. Palindrome Linked List

 
 

#235. Lowest Common Ancestor of a Binary Search Tree

#235. Lowest Common Ancestor of a Binary Search Tree

 
 

#236. Lowest Common Ancestor of a Binary Tree

#236. Lowest Common Ancestor of a Binary Tree

 
 

#237. Delete Node in a Linked List

#237. Delete Node in a Linked List

 
 

#242. Valid Anagram

#242. Valid Anagram

 
 

#257. Binary Tree Paths

#257. Binary Tree Paths

 
 

#258. Add Digits

#258. Add Digits

 
 

#26. Remove Duplicates from Sorted Array

#26. Remove Duplicates from Sorted Array

 
 

#260. Single Number III

#260. Single Number III

 
 

#27. Remove Element

#27. Remove Element

 
 

#28. Implement strStr()

#28. Implement strStr()

 
 

#283. Move Zeroes

#283. Move Zeroes

 
 

#303. Range Sum Query - Immutable

#303. Range Sum Query - Immutable

 
 

#344. Reverse String

#344. Reverse String

 
 

#345. Reverse Vowels of a String

#345. Reverse Vowels of a String

 
 

#349. Intersection of Two Arrays

#349. Intersection of Two Arrays

 
 

#35. Search Insert Position

#35. Search Insert Position

 
 

#350. Intersection of Two Arrays II

#350. Intersection of Two Arrays II

 
 

#383. Ransom Note

#383. Ransom Note

 
 

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😎 大三狗带你从零开始刷LeetCode !

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☕ The learning note about data structures, algorithms, and leetcode problems, which are based on java、python、golang, and c++.

goog.tech/leetcode

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python java golang c-plus-plus leetcode gitbook note algorithms-and-data-structures

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