Zoe Ding's Blog

Note

334 notes.

2022-11

1197. Minimum Knight Moves November 20
658. Find K Closest Elements November 20

2022-08

353. Design Snake Game August 23
2296. Design a Text Editor August 22
787. Cheapest Flights Within K Stops August 19
1298. Maximum Candies You Can Get from Boxes August 18
815. Bus Routes August 17
767. Reorganize String August 15
695. Max Area of Island August 15
2158. Amount of New Area Painted Each Day August 15
1293. Shortest Path in a Grid with Obstacles Elimination August 14
818. Race Car August 14
2034. Stock Price Fluctuation August 13
1048. Longest String Chain August 13
251. Flatten 2D Vector August 13
2096. Step-By-Step Directions From a Binary Tree Node to Another August 11
921. Minimum Add to Make Parentheses Valid August 11
44. Wildcard Matching August 8

2022-07

1257. Smallest Common Region July 31
1091. Shortest Path in Binary Matrix July 31
755. Pour Water July 31
336. Palindrome Pairs July 31
323. Number of Connected Components in an Undirected Graph July 25
797. All Paths From Source to Target July 25
244. Shortest Word Distance II July 24
528. Random Pick with Weight July 24
1396. Design Underground System July 24
1244. Design A Leaderboard July 24
71. Simplify Path July 23
609. Find Duplicate File in System July 23
362. Design Hit Counter July 17
1604. Alert Using Same Key-Card Three or More Times in a One Hour Period July 16
811. Subdomain Visit Count July 16
718. Maximum Length of Repeated Subarray July 16
1160. Find Words That Can Be Formed by Characters July 16
1166. Design File System July 16
209. Minimum Size Subarray Sum July 14
875. Koko Eating Bananas July 14

2022-06

8. String to Integer (atoi) June 8

2022-05

977. Squares of a Sorted Array May 23
High Frequency: Dynamic Programming May 23
High Frequency: Tree May 23
High Frequency: Graph May 23
High Frequency: Stack & Queue May 23
High Frequency: Heap May 23
High Frequency: Linked List May 23
High Frequency: Binary Search May 23
High Frequency: String May 23
High Frequency: Advanced May 23
High Frequency: Array May 23
High Frequency: Design May 23
Companies May 23
270. Closest Binary Search Tree Value May 15
994. Rotting Oranges May 11
409. Longest Palindrome May 9
150. Evaluate Reverse Polish Notation May 7
973. K Closest Points to Origin May 1
733. Flood Fill May 1

2022-04

125. Valid Palindrome April 30
242. Valid Anagram April 30
20. Valid Parentheses April 17
1249. Minimum Remove to Make Valid Parentheses April 17

2022-03

366. Find Leaves of Binary Tree March 19
1570. Dot Product of Two Sparse Vectors March 19
1762. Buildings With an Ocean View March 19
1650. Lowest Common Ancestor of a Binary Tree III March 18
314. Binary Tree Vertical Order Traversal March 17
27. Remove Element March 7
26. Remove Duplicates from Sorted Array March 7
1047. Remove All Adjacent Duplicates In String March 7
268. Missing Number March 3
692. Top K Frequent Words March 1

2022-02

21. Merge Two Sorted Lists February 5
143. Reorder List February 4

2022-01

75. Sort Colors January 25
283. Move Zeroes January 25
674. Longest Continuous Increasing Subsequence January 15
378. Kth Smallest Element in a Sorted Matrix January 6

2021-12

145. Binary Tree Postorder Traversal December 28
50. Pow(x, n) December 27
509. Fibonacci Number December 27

2020-03

1383. Maximum Performance of a Team March 15

2020-02

166. Fraction to Recurring Decimal February 22
994. Rotting Oranges February 18
642. Design Search Autocomplete System February 18
981. Time Based Key-Value Store February 16
68. Text Justification February 16
734. Sentence Similarity/737. Sentence Similarity II February 16
256. Paint House February 16
109. Convert Sorted List to Binary Search Tree February 16
1192. Critical Connections in a Network February 15
1249. Minimum Remove to Make Valid Parentheses February 9

2020-01

721. Accounts Merge January 6
863. All Nodes Distance K in Binary Tree January 5
722. Remove Comments January 4
273. Integer to English Words January 4
168. Excel Sheet Column Title January 2
426. Convert Binary Search Tree to Sorted Doubly Linked List January 1
106. Construct Binary Tree from Inorder and Postorder Traversal January 1

2019-12

687. Longest Univalue Path December 29
250. Count Univalue Subtrees December 29
228. Summary Ranges December 28
435. Non-overlapping Intervals December 28
452. Minimum Number of Arrows to Burst Balloons December 28
298. Binary Tree Longest Consecutive Sequence December 28
986. Interval List Intersections December 27
953. Verifying an Alien Dictionary December 26
339. Nested List Weight Sum/ 364. Nested List Weight Sum II December 26
341. Flatten Nested List Iterator December 26
332. Reconstruct Itinerary December 23
71. Simplify Path December 23
716. Max Stack December 23
225. Implement Stack using Queues December 23
232. Implement Queue using Stacks December 23
159. Longest Substring with At Most Two Distinct Characters December 22
290. Word Pattern December 20
523. Continuous Subarray Sum December 12
494. Target Sum December 7
282. Expression Add Operators December 7
163. Missing Ranges December 1
460. LFU Cache December 1

2019-11

735. Asteroid Collision November 30
246. Strobogrammatic Number November 28
247. Strobogrammatic Number II November 28
346. Moving Average from Data Stream November 28
388. Longest Absolute File Path November 28
527. Word Abbreviation November 27
286. Walls and Gates November 27
408. Valid Word Abbreviation November 27
130. Surrounded Regions November 26
621. Task Scheduler November 24
406. Queue Reconstruction by Height November 24
279. Perfect Squares November 24
205. Isomorphic Strings November 24
278. First Bad Version November 24
34. Find First and Last Position of Element in Sorted Array November 24
416. Partition Equal Subset Sum November 23
647. Palindromic Substrings November 23
438. Find All Anagrams in a String November 23
739. Daily Temperatures November 23
32. Longest Valid Parentheses November 22
394. Decode String November 22
301. Remove Invalid Parentheses November 20
157. Read N Characters Given Read4 November 20
158. Read N Characters Given Read4 II - Call multiple times November 20
High Frequency November 16
93. Restore IP Addresses November 10
198. House Robber November 2
213. House Robber II November 2
322. Coin Change November 2

2019-10

836. Rectangle Overlap October 31
560. Subarray Sum Equals K October 30
271. Encode and Decode Strings October 30
221. Maximal Square October 27
85. Maximal Rectangle October 27
312. Burst Balloons October 27
202. Happy Number October 26
543. Diameter of Binary Tree October 20
165. Compare Version Numbers October 20
3. Longest Substring Without Repeating Characters October 19
211. Add and Search Word - Data structure design October 19
Trie October 15
212. Word Search II October 14
238. Product of Array Except Self October 13
76. Minimum Window Substring October 13
4. Median of Two Sorted Arrays October 13
380. Insert Delete GetRandom O(1) October 12
295. Find Median from Data Stream October 11
227. Basic Calculator II October 10
694. Number of Distinct Islands October 10
688. Knight Probability in Chessboard October 10
391. Perfect Rectangle October 9
97. Interleaving String October 9
470. Implement Rand10() Using Rand7() October 7
30. Substring with Concatenation of All Words October 6
74. Search a 2D Matrix October 6
240. Search a 2D Matrix II October 6
794. Valid Tic-Tac-Toe State October 5
Topological Sort October 5
443. String Compression October 5
33. Search in Rotated Sorted Array October 5
431. Encode N-ary Tree to Binary Tree October 5
207. Course Schedule October 5
210. Course Schedule II October 5
269. Alien Dictionary October 5
428. Serialize and Deserialize N-ary Tree October 4
449. Serialize and Deserialize BST October 4
297. Serialize and Deserialize Binary Tree October 4
348. Design Tic-Tac-Toe October 4

2019-09

490. The Maze September 29
505. The Maze II September 29
973. K Closest Points to Origin September 29
1135. Connecting Cities With Minimum Cost September 29
Union Find September 28
763. Partition Labels September 28
1167. Minimum Cost to Connect Sticks September 26
347. Top K Frequent Elements September 26
937. Reorder Data in Log Files September 26
105. Construct Binary Tree from Preorder and Inorder Traversal September 23
116. Populating Next Right Pointers in Each Node/ 117. Populating Next Right Pointers in Each Node II September 22
138. Copy List with Random Pointer September 22
239. Sliding Window Maximum September 21
173. Binary Search Tree Iterator September 20
23. Merge k Sorted Lists September 16
36. Valid Sudoku September 15
54. Spiral Matrix/59. Spiral Matrix II September 15
48. Rotate Image September 15
318. Maximum Product of Word Lengths September 15
73. Set Matrix Zeroes September 14
731. My Calendar II September 9
621. Task Scheduler September 8
729. My Calendar I September 8
252. Meeting Rooms September 8
253. Meeting Rooms II September 8
57. Insert Interval September 8
334. Increasing Triplet Subsequence September 8
299. Bulls and Cows September 8
56. Merge Intervals September 7
289. Game of Life September 6
220. Contains Duplicate III September 4
219. Contains Duplicate II September 4
189. Rotate Array September 3
169. Majority Element/ 229. Majority Element II September 3
134. Gas Station September 3
135. Candy September 3
128. Longest Consecutive Sequence September 1

2019-08

41. First Missing Positive August 29
170. Two Sum III - Data structure design August 27
155. Min Stack August 27
146. LRU Cache August 27
24. Swap Nodes in Pairs August 25
82. Remove Duplicates from Sorted List II August 25
160. Intersection of Two Linked Lists August 25
98. Validate Binary Search Tree August 21
114. Flatten Binary Tree to Linked List August 20
206. Reverse Linked List August 18
92. Reverse Linked List II August 18
51. N-Queens August 18
294. Flip Game II August 11
669. Trim a Binary Search Tree August 10
129. Sum Root to Leaf Numbers August 10
100. Same Tree August 10
14. Longest Common Prefix August 10
387. First Unique Character in a String August 10
108. Convert Sorted Array to Binary Search Tree August 10
257. Binary Tree Paths August 10
437. Path Sum III August 8
124. Binary Tree Maximum Path Sum August 8
112. Path Sum August 7
113. Path Sum II August 7
42. Trapping Rain Water August 6
84. Largest Rectangle in Histogram August 5
64. Minimum Path Sum August 4
236. Lowest Common Ancestor of a Binary Tree August 4
235. Lowest Common Ancestor of a Binary Search Tree August 4
91. Decode Ways August 4
62. Unique Paths August 3
63. Unique Paths II August 3
101. Symmetric Tree August 3
161. One Edit Distance August 3
300. Longest Increasing Subsequence August 3
72. Edit Distance August 3

2019-07

140. Word Break II July 31
Selection Sort July 31
Quick Sort July 31
Merge Sort July 31
53. Maximum Subarray July 31
Binary Search July 31
55. Jump Game July 27
45. Jump Game II July 27
13. Roman to Integer July 21
695. Max Area of Island July 21
12. Integer to Roman July 21
547. Friend Circles July 21
542. 01 Matrix July 20
127. Word Ladder July 20
261. Graph Valid Tree July 20
784. Letter Case Permutation July 14
79. Word Search July 13
208. Implement Trie (Prefix Tree) July 13
77. Combinations July 12
216. Combination Sum III July 11
148. Sort List July 2

2019-05

859. Buddy Strings May 20
680. Valid Palindrome II May 12

2019-04

257. Binary Tree Paths April 21
94. Binary Tree Inorder Traversal April 21
104. Maximum Depth of Binary Tree April 19
139. Word Break April 18
152. Maximum Product Subarray April 18
70. Climbing Stairs April 9
5. Longest Palindromic Substring April 8
121. Best Time to Buy and Sell Stock April 8

2019-03

785. Is Graph Bipartite? March 20
958. Check Completeness of a Binary Tree March 20
200. Number of Islands March 17
133. Clone Graph March 17
103. Binary Tree Zigzag Level Order Traversal March 17
199. Binary Tree Right Side View March 17
102. Binary Tree Level Order Traversal March 17
107. Binary Tree Level Order Traversal II March 17
31. Next Permutation March 12
148. Sort List March 9
47. Permutations II March 6

2019-02

46. Permutations February 27
39. Combination Sum February 26
40. Combination Sum II February 26
96. Unique Binary Search Trees February 24
95. Unique Binary Search Trees II February 24
617. Merge Two Binary Trees February 24
80. Remove Duplicates from Sorted Array II February 18
215. Kth Largest Element in an Array February 15
38. Count and Say February 13
78. Subsets February 10
90. Subsets II February 10
17. Letter Combinations of a Phone Number February 10
22. Generate Parentheses February 10
121. Best Time to Buy and Sell Stock February 8
122. Best Time to Buy and Sell Stock II February 8

2019-01

19. Remove Nth Node From End of List January 27
28. Implement strStr() January 27
18. 4Sum January 27
151. Reverse Words in a String January 26
345. Reverse Vowels of a String January 24
9. Palindrome Number January 20
6. ZigZag Conversion January 19
7. Reverse Integer January 19
10. Regular Expression Matching January 17
16. 3Sum Closest January 16
1. Two Sum January 15
15. 3Sum January 15
11. Container With Most Water January 13
144. Binary Tree Preorder Traversal January 13
110. Balanced Binary Tree January 13