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1. Two Sum
10. Regular Expression Matching
1002. Find Common Characters
1004. Max Consecutive Ones III
1008. Construct Binary Search Tree from Preorder Traversal
1009. Complement of Base 10 Integer
101. Symmetric Tree
- 101. Symmetric Tree.py
- 101. Symmetric Tree_1.py
1010. Pairs of Songs With Total Durations Divisible by 60
102. Binary Tree Level Order Traversal
103. Binary Tree Zigzag Level Order Traversal
104. Maximum Depth of Binary Tree
1046. Last Stone Weight
1047. Remove All Adjacent Duplicates In String
1060. Missing Element in Sorted Array
107. Binary Tree Level Order Traversal II
108. Convert Sorted Array to Binary Search Tree
1089. Duplicate Zeros
109. Convert Sorted List to Binary Search Tree
1094. Car Pooling
1099. Two Sum Less Than K
11. Container With Most Water
1114. Print in Order
1115. Print FooBar Alternately
1116. Print Zero Even Odd
112. Path Sum
113. Path Sum II
114. Flatten Binary Tree to Linked List
1150. Check If a Number Is Majority Element in a Sorted Array
116. Populating Next Right Pointers in Each Node
1167. Minimum Cost to Connect Sticks
117. Populating Next Right Pointers in Each Node II
118. Pascal's Triangle
1189. Maximum Number of Balloons
119. Pascal's Triangle II
1195. Fizz Buzz Multithreaded
1196. How Many Apples Can You Put into the Basket
1198. Find Smallest Common Element in All Rows
1200. Minimum Absolute Difference
121. Best Time to Buy and Sell Stock
1213. Intersection of Three Sorted Arrays
122. Best Time to Buy and Sell Stock II
1228. Missing Number In Arithmetic Progression
1229. Meeting Scheduler
1236. Web Crawler
124. Binary Tree Maximum Path Sum
1249. Minimum Remove to Make Valid Parentheses
125. Valid Palindrome
1260. Shift 2D Grid
127. Word Ladder
1272. Remove Interval
128. Longest Consecutive Sequence
1287. Element Appearing More Than 25% In Sorted Array
129. Sum Root to Leaf Numbers
1290. Convert Binary Number in a Linked List to Integer
130. Surrounded Regions
1302. Deepest Leaves Sum
1305. All Elements in Two Binary Search Trees
1306. Jump Game III
1325. Delete Leaves With a Given Value
1337. The K Weakest Rows in a Matrix
1338. Reduce Array Size to The Half
1347. Minimum Number of Steps to Make Two Strings Anagram
1351. Count Negative Numbers in a Sorted Matrix
136. Single Number
137. Single Number II
138. Copy List with Random Pointer
1381. Design a Stack With Increment Operation
139. Word Break
14. Longest Common Prefix
141. Linked List Cycle
142. Linked List Cycle II
1429. First Unique Number
144. Binary Tree Preorder Traversal
146. LRU Cache
1464. Maximum Product of Two Elements in an Array
1469. Find All the Lonely Nodes
147. Insertion Sort List
1470. Shuffle the Array
1471. The k Strongest Values in an Array
1472. Design Browser History
15. 3Sum
150. Evaluate Reverse Polish Notation
151. Reverse Words in a String
152. Maximum Product Subarray
153. Find Minimum in Rotated Sorted Array
155. Min Stack
156. Binary Tree Upside Down
159. Longest Substring with At Most Two Distinct Characters
16. 3Sum Closest
160. Intersection of Two Linked Lists
161. One Edit Distance
162. Find Peak Element
163. Missing Ranges
165. Compare Version Numbers
1657. Determine if Two Strings Are Close
167. Two Sum II - Input array is sorted
1680. Concatenation of Consecutive Binary Numbers
17. Letter Combinations of a Phone Number
170. Two Sum III - Data structure design
171. Excel Sheet Column Number
172. Factorial Trailing Zeroes
1721. Swapping Nodes in a Linked List
173. Binary Search Tree Iterator
1732. Find the Highest Altitude
179. Largest Number
186. Reverse Words in a String II
189. Rotate Array
190. Reverse Bits
191. Number of 1 Bits
198. House Robber
199. Binary Tree Right Side View
2. Add Two Numbers
20. Valid Parentheses
200. Number of Islands
202. Happy Number
203. Remove Linked List Elements
204. Count Primes
205. Isomorphic Strings
206. Reverse Linked List
207. Course Schedule
208. Implement Trie (Prefix Tree)
209. Minimum Size Subarray Sum
21. Merge Two Sorted Lists
210. Course Schedule II
211. Add and Search Word - Data structure design
213. House Robber II
215. Kth Largest Element in an Array
216. Combination Sum III
219. Contains Duplicate II
22. Generate Parentheses
220. Contains Duplicate III
2225. Find Players With Zero or One Losses
2231. Largest Number After Digit Swaps by Parity
2233. Maximum Product After K Increments
226. Invert Binary Tree
2294. Partition Array Such That Maximum Difference Is K
23. Merge k Sorted Lists
230. Kth Smallest Element in a BST
2331. Evaluate Boolean Binary Tree
234. Palindrome Linked List
237. Delete Node in a Linked List
238. Product of Array Except Self
239. Sliding Window Maximum
240. Search a 2D Matrix II
242. Valid Anagram
2441. Largest Positive Integer That Exists With Its Negative
251. Flatten 2D Vector
252. Meeting Rooms
253. Meeting Rooms II
2540. Minimum Common Value
256. Paint House
259. 3Sum Smaller
26. Remove Duplicates from Sorted Array
260. Single Number III
261. Graph Valid Tree
263. Ugly Number
266. Palindrome Permutation
268. Missing Number
27. Remove Element
273. Integer to English Words
274. H-Index
275. H-Index II
278. First Bad Version
281. Zigzag Iterator
283. Move Zeroes
285. Inorder Successor in BST
287. Find the Duplicate Number
289. Game of Life
29. Divide Two Integers
295. Find Median from Data Stream
297. Serialize and Deserialize Binary Tree
298. Binary Tree Longest Consecutive Sequence
3. Longest Substring Without Repeating Characters
30 Days April Challange
30 Days August Challange
30 Days July Coding Challange
30 Days June Challange
30 Days May Challange
30 Days September Challange
30 Days of October Challange
300. Longest Increasing Subsequence
301. Remove Invalid Parentheses
303. Range Sum Query - Immutable
314. Binary Tree Vertical Order Traversal
316. Remove Duplicate Letters
32. Longest Valid Parentheses
3217. Delete Nodes From Linked List Present in Array
322. Coin Change
323. Number of Connected Components in an Undirected Graph
325. Maximum Size Subarray Sum Equals k
328. Odd Even Linked List
329. Longest Increasing Path in a Matrix
33. Search in Rotated Sorted Array
334. Increasing Triplet Subsequence
337. House Robber III
338. Counting Bits
339. Nested List Weight Sum
34. Find First and Last Position of Element in Sorted Array
340. Longest Substring with At Most K Distinct Characters
341. Flatten Nested List Iterator
342. Power of Four
344. Reverse String
345. Reverse Vowels of a String
346. Moving Average from Data Stream
347. Top K Frequent Elements
349. Intersection of Two Arrays
35. Search Insert Position
350. Intersection of Two Arrays II
358. Rearrange String k Distance Apart
360. Sort Transformed Array
362. Design Hit Counter
364. Nested List Weight Sum II
366. Find Leaves of Binary Tree
369. Plus One Linked List
373. Find K Pairs with Smallest Sums
374. Guess Number Higher or Lower
377. Combination Sum IV
378. Kth Smallest Element in a Sorted Matrix
380. Insert Delete GetRandom O(1)
382. Linked List Random Node
384. Shuffle an Array
387. First Unique Character in a String
389. Find the Difference
39. Combination Sum
392. Is Subsequence
394. Decode String
395. Longest Substring with At Least K Repeating Characters
398. Random Pick Index
40. Combination Sum II
402. Remove K Digits
41. First Missing Positive
412. Fizz Buzz
415. Add Strings
424. Longest Repeating Character Replacement
429. N-ary Tree Level Order Traversal
435. Non-overlapping Intervals
438. Find All Anagrams in a String
448. Find All Numbers Disappeared in an Array
449. Serialize and Deserialize BST
45. Jump Game II
451. Sort Characters By Frequency
452. Minimum Number of Arrows to Burst Balloons
454. 4Sum II
457. Circular Array Loop
46. Permutations
461. Hamming Distance
463. Island Perimeter
47. Permutations II
472. Concatenated Words
476. Number Complement
48. Rotate Image
480. Sliding Window Median
485. Max Consecutive Ones
487. Max Consecutive Ones II
49. Group Anagrams
490. The Maze
496. Next Greater Element I
5. Longest Palindromic Substring
50. Pow(x, n)
505. The Maze II
513. Find Bottom Left Tree Value
515. Find Largest Value in Each Tree Row
523. Continuous Subarray Sum
524. Longest Word in Dictionary through Deleting
525. Contiguous Array
528. Random Pick with Weight
53. Maximum Subarray
530. Minimum Absolute Difference in BST
532. K-diff Pairs in an Array
54. Spiral Matrix
542. 01 Matrix
543. Diameter of Binary Tree
545. Boundary of Binary Tree
55. Jump Game
554. Brick Wall
559. Maximum Depth of N-ary Tree
56. Merge Intervals
560. Subarray Sum Equals K
566. Reshape the Matrix
57. Insert Interval
575. Distribute Candies
589. N-ary Tree Preorder Traversal
59. Spiral Matrix II
590. N-ary Tree Postorder Traversal
599. Minimum Index Sum of Two Lists
61. Rotate List
62. Unique Paths
621. Task Scheduler
622. Design Circular Queue
624. Maximum Distance in Arrays
626. Exchange Seats
64. Minimum Path Sum
643. Maximum Average Subarray I
645. Set Mismatch
647. Palindromic Substrings
648. Replace Words
653. Two Sum IV - Input is a BST
657. Robot Return to Origin
676. Implement Magic Dictionary
680. Valid Palindrome II
681. Next Closest Time
682. Baseball Game
692. Top K Frequent Words
693. Binary Number with Alternating Bits
694. Number of Distinct Islands
695. Max Area of Island
697. Degree of an Array
7. Reverse Integer
70. Climbing Stairs
700. Search in a Binary Search Tree
703. Kth Largest Element in a Stream
706. Design HashMap
71. Simplify Path
713. Subarray Product Less Than K
714. Best Time to Buy and Sell Stock with Transaction Fee
716. Max Stack
717. 1-bit and 2-bit Characters
718. Maximum Length of Repeated Subarray
719. Find K-th Smallest Pair Distance
72. Edit Distance
720. Longest Word in Dictionary
722. Remove Comments
725. Split Linked List in Parts
73. Set Matrix Zeroes
734. Sentence Similarity
737. Sentence Similarity II
739. Daily Temperatures
74. Search a 2D Matrix
744. Find Smallest Letter Greater Than Target
746. Min Cost Climbing Stairs
747. Largest Number At Least Twice of Others
75. Sort Colors
763. Partition Labels
767. Reorganize String
769. Max Chunks To Make Sorted
77. Combinations
78. Subsets
783. Minimum Distance Between BST Nodes
784. Letter Case Permutation
79. Word Search
791. Custom Sort String
792. Number of Matching Subsequences
8. String to Integer (atoi)
80. Remove Duplicates from Sorted Array II
81. Search in Rotated Sorted Array II
817. Linked List Components
819. Most Common Word
82. Remove Duplicates from Sorted List II
83. Remove Duplicates from Sorted List
832. Flipping an Image
84. Largest Rectangle in Histogram
844. Backspace String Compare
848. Shifting Letters
852. Peak Index in a Mountain Array
867. Transpose Matrix
876. Middle of the Linked List
88. Merge Sorted Array
881. Boats to Save People
89. Gray Code
896. Monotonic Array
9. Palindrome Number
905. Sort Array By Parity
912. Sort an Array
915. Partition Array into Disjoint Intervals
917. Reverse Only Letters
92. Reverse Linked List II
925. Long Pressed Name
930. Binary Subarrays With Sum
938. Range Sum of BST
94. Binary Tree Inorder Traversal
945. Minimum Increment to Make Array Unique
953. Verifying an Alien Dictionary
961. N-Repeated Element in Size 2N Array
973. K Closest Points to Origin
974. Subarray Sums Divisible by K
977. Squares of a Sorted Array
98. Validate Binary Search Tree
981. Time Based Key-Value Store
986. Interval List Intersections
988. Smallest String Starting From Leaf
993. Cousins in Binary Tree
100_Same_Tree.py
1022_Sum_of_Root_To_Leaf_Binary_Numbers.py
103_Binary_Tree_Zigzag_Level_Order_Traversal.py
1052. Grumpy Bookstore Owner.py
105_Construct_Binary_Tree_from_Preorder_and_Inorder_Traversal.py
106_Construct Binary_Tree_from_Inorder_and_Postorder_Traversal.py
1085_Sum_of_Digits_in_the_Minimum_Number.py
1119_Remove_Vowels_from_a_String.py
111_Minimum_Depth_of_Binary_Tree.py
1133. Largest Unique Number.py
1161_Maximum_Level_Sum_of_a_Binary_Tree.py
1165_Single-Row_Keyboard.py
1213. Intersection of Three Sorted Arrays.py
129_Sum_Root_to_Leaf_Numbers.py
144_Binary_Tree_Preorder_Traversal.py
144_Binary_Tree_Preorder_Traversal_1.py
145_Binary_Tree_Postorder_Traversal.py
145_Binary_Tree_Postorder_Traversal_1.py.py
151_Reverse_Words_in_a_String.py
15_3sum_zero.py
169_majority_element.py
16_3sum_closest.py
16_3sum_zero.py
204_count_primes.py
229_majority_element_II.py
229_majority_element_ii.py
231_power_of_two.py
235_Lowest_Common_Ancestor_of_a_Binary_Search_Tree.py
236_Lowest_Common_Ancestor of_a_Binary_Tree.py
243_Shortest_Word_Distance.py
257_Binary_Tree_Paths.py
258_Add_Digits.py
268_missing_number.py
270. Closest Binary Search Tree Value.py
27_remove_element.py
350. Intersection of Two Arrays II.py
372_Super_Pow.py
383_Ransom_Note.py
404_Sum_of_Left_Leaves.py
42. Trapping Rain Water.py
434_Number_of_Segments_in_a_String.py
49. Group Anagrams.py
501. Find Mode in Binary Search Tree.py
509. Fibonacci Number.py
551_Student_Attendance_Record_I.py
557. Reverse Words in a String III.py
557. Reverse Words in a String III_1.py
637_Average_of_Levels_in_Binary_Tree.py
66_plus_one.py
680_Valid_Palindrome_II.py
700. Search in a Binary Search Tree.py
701. Insert into a Binary Search Tree.py
704. Binary Search.py
709_To_lower_case.py
88_merge_sorted_array.py
912. Sort an Array.py
94_Binary_Tree_Inorder_Traversal.py
94_Binary_Tree_Inorder_Traversal_1.py
965_Univalued_Binary_Tree.py
98. Validate Binary Search Tree.py
991. Broken Calculator.py
readme.md
reverse_integer.py

101. Symmetric Tree

O(n) time and O(n) space using Deque(Iterative)

Jun 17, 2020

30c75ee · Jun 17, 2020

Name	Name	Last commit message	Last commit date
parent directory ..
101. Symmetric Tree.py	101. Symmetric Tree.py	O(n) time and O(n) space using recursion.	Jun 16, 2020
101. Symmetric Tree_1.py	101. Symmetric Tree_1.py	O(n) time and O(n) space using Deque(Iterative)	Jun 17, 2020

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