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My leetcode solutions in C

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1. Two Sum.c
 
 
10. Regular Expression Matching.c
 
 
1007. Minimum Domino Rotations For Equal Row.c
 
 
1008. Construct Binary Search Tree from Preorder Traversal.c
 
 
101. Symmetric Tree.c
 
 
1011. Capacity To Ship Packages Within D Days.c
 
 
102. Binary Tree Level Order Traversal.c
 
 
103. Binary Tree Zigzag Level Order Traversal.c
 
 
104. Maximum Depth of Binary Tree.c
 
 
105. Construct Binary Tree from Preorder and Inorder Traversal.c
 
 
106. Construct Binary Tree from Inorder and Postorder Traversal.c
 
 
107. Binary Tree Level Order Traversal II.c
 
 
108. Convert Sorted Array to Binary Search Tree.c
 
 
11. Container With Most Water.c
 
 
114. Flatten Binary Tree to Linked List.c
 
 
116. Populating Next Right Pointers in Each Node.c
 
 
117. Populating Next Right Pointers in Each Node II.c
 
 
118. Pascal's Triangle.c
 
 
12. Integer to Roman.c
 
 
120. Triangle.c
 
 
121. Best Time to Buy and Sell Stock.c
 
 
122. Best Time to Buy and Sell Stock II.c
 
 
123. Best Time to Buy and Sell Stock III.c
 
 
124. Binary Tree Maximum Path Sum.c
 
 
125. Valid Palindrome.c
 
 
126. Word Ladder II.c
 
 
127. Word Ladder.c
 
 
128. Longest Consecutive Sequence.c
 
 
13. Roman to Integer.c
 
 
131. Palindrome Partitioning.c
 
 
132. Palindrome Partitioning II.c
 
 
133. Clone Graph.c
 
 
135. Candy.c
 
 
136. Single Number.c
 
 
137. Single Number II.c
 
 
138. Copy List with Random Pointer.c
 
 
139. Word Break.c
 
 
14. Longest Common Prefix.c
 
 
140. Word Break II.c
 
 
141. Linked List Cycle.c
 
 
142. Linked List Cycle II.c
 
 
144. Binary Tree Preorder Traversal.c
 
 
145. Binary Tree Postorder Traversal.c
 
 
146. LRU Cache.c
 
 
148. Sort List.c
 
 
149. Max Points on a Line.c
 
 
15. 3Sum.c
 
 
151. Reverse Words in a String.c
 
 
152. Maximum Product Subarray.c
 
 
155. Min Stack.c
 
 
156. Binary Tree Upside Down.c
 
 
158. Read N Characters Given Read4 II - Call multiple times.c
 
 
159. Longest Substring with At Most Two Distinct Characters.c
 
 
16. 3Sum Closest.c
 
 
160. Intersection of Two Linked Lists.c
 
 
161. One Edit Distance.c
 
 
162. Find Peak Element.c
 
 
163. Missing Ranges.c
 
 
165. Compare Version Numbers.c
 
 
166. Fraction to Recurring Decimal.c
 
 
167. Two Sum II - Input array is sorted.c
 
 
168. Excel Sheet Column Title.c
 
 
17. Letter Combinations of a Phone Number.c
 
 
170. Two Sum III - Data structure design.c
 
 
171. Excel Sheet Column Number.c
 
 
173. Binary Search Tree Iterator.c
 
 
186. Reverse Words in a String II.c
 
 
187. Repeated DNA Sequences.c
 
 
188. Best Time to Buy and Sell Stock IV.c
 
 
19. Remove Nth Node From End of List.c
 
 
190. Reverse Bits.c
 
 
191. Number of 1 Bits.c
 
 
198. House Robber.c
 
 
199. Binary Tree Right Side View.c
 
 
2. Add Two Numbers.c
 
 
20. Valid Parentheses.c
 
 
200. Number of Islands.c
 
 
202. Happy Number.c
 
 
205. Isomorphic Strings.c
 
 
206. Reverse Linked List.c
 
 
207. Course Schedule.c
 
 
208. Implement Trie (Prefix Tree).c
 
 
209. Minimum Size Subarray Sum.c
 
 
21. Merge Two Sorted Lists.c
 
 
210. Course Schedule II.c
 
 
211. Add and Search Word - Data structure design.c
 
 
212. Word Search II.c
 
 
213. House Robber II.c
 
 
214. Shortest Palindrome.c
 
 
215. Kth Largest Element in an Array.c
 
 
217. Contains Duplicate.c
 
 
218. The Skyline Problem.c
 
 
219. Contains Duplicate II.c
 
 
22. Generate Parentheses.c
 
 
220. Contains Duplicate III.c
 
 
221. Maximal Square.c
 
 
222. Count Complete Tree Nodes.c
 
 
223. Rectangle Area.c
 
 
224. Basic Calculator.c
 
 
227. Basic Calculator II.c
 
 
228. Summary Ranges.c
 
 
229. Majority Element II.c
 
 
23. Merge k Sorted Lists.c
 
 
230. Kth Smallest Element in a BST.c
 
 
231. Power of Two.c
 
 
234. Palindrome Linked List.c
 
 
235. Lowest Common Ancestor of a Binary Search Tree.c
 
 
236. Lowest Common Ancestor of a Binary Tree.c
 
 
237. Delete Node in a Linked List.c
 
 
238. Product of Array Except Self.c
 
 
239. Sliding Window Maximum.c
 
 
24. Swap Nodes in Pairs.c
 
 
240. Search a 2D Matrix II.c
 
 
241. Different Ways to Add Parentheses.c
 
 
242. Valid Anagram.c
 
 
243. Shortest Word Distance.c
 
 
244. Shortest Word Distance II.c
 
 
245. Shortest Word Distance III.c
 
 
246. Strobogrammatic Number.c
 
 
247. Strobogrammatic Number II.c
 
 
249. Group Shifted Strings.c
 
 
25. Reverse Nodes in k-Group.c
 
 
251. Flatten 2D Vector.c
 
 
253. Meeting Rooms II.c
 
 
254. Factor Combinations.c
 
 
256. Paint House.c
 
 
257. Binary Tree Paths.c
 
 
259. 3Sum Smaller.c
 
 
26. Remove Duplicates from Sorted Array.c
 
 
260. Single Number III.c
 
 
261. Graph Valid Tree.c
 
 
263. Ugly Number.c
 
 
264. Ugly Number II.c
 
 
265. Paint House II.c
 
 
266. Palindrome Permutation.c
 
 
268. Missing Number.c
 
 
269. Alien Dictionary.c
 
 
27. Remove Element.c
 
 
270. Closest Binary Search Tree Value.c
 
 
271. Encode and Decode Strings.c
 
 
272. Closest Binary Search Tree Value II.c
 
 
273. Integer to English Words.c
 
 
274. H-Index.c
 
 
275. H-Index II.c
 
 
276. Paint Fence.c
 
 
277. Find the Celebrity.c
 
 
278. First Bad Version.c
 
 
279. Perfect Squares.c
 
 
28. Implement strStr().c
 
 
280. Wiggle Sort.c
 
 
281. Zigzag Iterator.c
 
 
282. Expression Add Operators.c
 
 
283. Move Zeroes.c
 
 
285. Inorder Successor in BST.c
 
 
286. Walls and Gates.c
 
 
287. Find the Duplicate Number.c
 
 
288. Unique Word Abbreviation.c
 
 
289. Game of Life.c
 
 
290. Word Pattern.c
 
 
291. Word Pattern II.c
 
 
292. Nim Game.c
 
 
293. Flip Game.c
 
 
294. Flip Game II.c
 
 
295. Find Median from Data Stream.c
 
 
297. Serialize and Deserialize Binary Tree.c
 
 
298. Binary Tree Longest Consecutive Sequence.c
 
 
3. Longest Substring Without Repeating Characters.c
 
 
30. Substring with Concatenation of All Words.c
 
 
300. Longest Increasing Subsequence.c
 
 
301. Remove Invalid Parentheses.c
 
 
302. Smallest Rectangle Enclosing Black Pixels.c
 
 
305. Number of Islands II.c
 
 
308. Range Sum Query 2D - Mutable.c
 
 
309. Best Time to Buy and Sell Stock with Cooldown.c
 
 
31. Next Permutation.c
 
 
311. Sparse Matrix Multiplication.c
 
 
314. Binary Tree Vertical Order Traversal.c
 
 
315. Count of Smaller Numbers After Self.c
 
 
317. Shortest Distance from All Buildings.c
 
 
318. Maximum Product of Word Lengths.c
 
 
32. Longest Valid Parentheses.c
 
 
320. Generalized Abbreviation.c
 
 
322. Coin Change.c
 
 
323. Number of Connected Components in an Undirected Graph.c
 
 
324. Wiggle Sort II.c
 
 
325. Maximum Size Subarray Sum Equals k.c
 
 
326. Power of Three.c
 
 
327. Count of Range Sum.c
 
 
329. Longest Increasing Path in a Matrix.c
 
 
33. Search in Rotated Sorted Array.c
 
 
332. Reconstruct Itinerary.c
 
 
333. Largest BST Subtree.c
 
 
334. Increasing Triplet Subsequence.c
 
 
336. Palindrome Pairs.c
 
 
337. House Robber III.c
 
 
338. Counting Bits.c
 
 
339. Nested List Weight Sum.c
 
 
34. Search for a Range.c
 
 
340. Longest Substring with At Most K Distinct Characters.c
 
 
341. Flatten Nested List Iterator.c
 
 
342. Power of Four.c
 
 
344. Reverse String.c
 
 
345. Reverse Vowels of a String.c
 
 
346. Moving Average from Data Stream.c
 
 
348. Design Tic-Tac-Toe.c
 
 
350. Intersection of Two Arrays II.c
 
 
351. Android Unlock Patterns.c
 
 
358. Rearrange String k Distance Apart.c
 
 
359. Logger Rate Limiter.c
 
 
36. Valid Sudoku.c
 
 
360. Sort Transformed Array.c
 
 
361. Bomb Enemy.c
 
 
362. Design Hit Counter.c
 
 
363. Max Sum of Rectangle No Larger Than K.c
 
 
364. Nested List Weight Sum II.c
 
 
366. Find Leaves of Binary Tree.c
 
 
367. Valid Perfect Square.c
 
 
369. Plus One Linked List.c
 
 
37. Sudoku Solver.c
 
 
373. Find K Pairs with Smallest Sums.c
 
 
375. Guess Number Higher or Lower II.c
 
 
377. Combination Sum IV.c
 
 
378. Kth Smallest Element in a Sorted Matrix.c
 
 
379. Design Phone Directory.c
 
 
38. Count and Say.c
 
 
380. Insert Delete GetRandom O(1).c
 
 
382. Linked List Random Node.c
 
 
383. Ransom Note.c
 
 
387. First Unique Character in a String.c
 
 
388. Longest Absolute File Path.c
 
 
389. Find the Difference.c
 
 
39. Combination Sum.c
 
 
391. Perfect Rectangle.c
 
 
392. Is Subsequence.c
 
 
393. UTF-8 Validation.c
 
 
394. Decode String.c
 
 
397. Integer Replacement.c
 
 
398. Random Pick Index.c
 
 
399. Evaluate Division.c
 
 
4. Median of Two Sorted Arrays.c
 
 
40. Combination Sum II.c
 
 
400. Nth Digit.c
 
 
401. Binary Watch.c
 
 
402. Remove K Digits.c
 
 
403. Frog Jump.c
 
 
404. Sum of Left Leaves.c
 
 
406. Queue Reconstruction by Height.c
 
 
407. Trapping Rain Water II.c
 
 
408. Valid Word Abbreviation.c
 
 
409. Longest Palindrome.c
 
 
41. First Missing Positive.c
 
 
410. Split Array Largest Sum.c
 
 
411. Minimum Unique Word Abbreviation.c
 
 
415. Add Strings.c
 
 
416. Partition Equal Subset Sum.c
 
 
417. Pacific Atlantic Water Flow.c
 
 
418. Sentence Screen Fitting.c
 
 
42. Trapping Rain Water.c
 
 
421. Maximum XOR of Two Numbers in an Array.c
 
 
422. Valid Word Square.c
 
 
424. Longest Repeating Character Replacement.c
 
 
425. Word Squares.c
 
 
426. Convert Binary Search Tree to Sorted Doubly Linked List.py
 
 
43. Multiply Strings.c
 
 
437. Path Sum III.c
 
 
438. Find All Anagrams in a String.c
 
 
44. Wildcard Matching.c
 
 
444. Sequence Reconstruction.c
 
 
447. Number of Boomerangs.c
 
 
448. Find All Numbers Disappeared in an Array.c
 
 
450. Delete Node in a BST.c
 
 
459. Repeated Substring Pattern.c
 
 
46. Permutations.c
 
 
460. LFU Cache.c
 
 
461. Hamming Distance.c
 
 
463. Island Perimeter.c
 
 
464. Can I Win.c
 
 
465. Optimal Account Balancing.c
 
 
47. Permutations II.c
 
 
471. Encode String with Shortest Length.c
 
 
475. Heaters.c
 
 
476. Number Complement.c
 
 
477. Total Hamming Distance.c
 
 
48. Rotate Image.c
 
 
482. License Key Formatting.c
 
 
484. Find Permutation.c
 
 
486. Predict the Winner.c
 
 
489. Robot Room Cleaner.py
 
 
49. Group Anagrams.c
 
 
490. The Maze.c
 
 
494. Target Sum.c
 
 
5. Longest Palindromic Substring.c
 
 
50. Pow(x, n).c
 
 
51. N-Queens.c
 
 
516. Longest Palindromic Subsequence.c
 
 
52. N-Queens II.c
 
 
523. Continuous Subarray Sum.c
 
 
525. Contiguous Array.c
 
 
527. Word Abbreviation.c
 
 
53. Maximum Subarray.c
 
 
54. Spiral Matrix.c
 
 
543. Diameter of Binary Tree.c
 
 
545. Boundary of Binary Tree.c
 
 
548. Split Array with Equal Sum.c
 
 
554. Brick Wall.c
 
 
56. Merge Intervals.c
 
 
560. Subarray Sum Equals K.c
 
 
567. Permutation in String.c
 
 
57. Insert Interval.c
 
 
572. Subtree of Another Tree.c
 
 
587. Erect the Fence.c
 
 
59. Spiral Matrix II.c
 
 
6. ZigZag Conversion.c
 
 
62. Unique Paths.c
 
 
621. Task Scheduler.c
 
 
630. Course Schedule III.c
 
 
636. Exclusive Time of Functions.c
 
 
639. Decode Ways II.c
 
 
646. Maximum Length of Pair Chain.c
 
 
647. Palindromic Substrings.c
 
 
648. Replace Words.c
 
 
65. Valid Number.c
 
 
66. Plus One.c
 
 
673. Number of Longest Increasing Subsequence.c
 
 
68. Text Justification.c
 
 
687. Longest Univalue Path.c
 
 
689. Maximum Sum of 3 Non-Overlapping Subarrays.c
 
 
69. Sqrt(x).c
 
 
693. Binary Number with Alternating Bits.c
 
 
7. Reverse Integer.c
 
 
70. Climbing Stairs.c
 
 
71. Simplify Path.c
 
 
714. Best Time to Buy and Sell Stock with Transaction Fee.c
 
 
72. Edit Distance.c
 
 
723. Candy Crush.c
 
 
736. Parse Lisp Expression.c
 
 
74. Search a 2D Matrix.c
 
 
75. Sort Colors.c
 
 
751. IP to CIDR.c
 
 
76. Minimum Window Substring.c
 
 
762. Prime Number of Set Bits in Binary Representation.c
 
 
767. Reorganize String.c
 
 
77. Combinations.c
 
 
774. Minimize Max Distance to Gas Station.c
 
 
777. Swap Adjacent in LR String.c
 
 
78. Subsets.c
 
 
780. Reaching Points.c
 
 
79. Word Search.c
 
 
8. String to Integer (atoi).c
 
 
80. Remove Duplicates from Sorted Array II.c
 
 
809. Expressive Words.c
 
 
81. Search in Rotated Sorted Array II.c
 
 
82. Remove Duplicates from Sorted List II.c
 
 
83. Remove Duplicates from Sorted List.c
 
 
833. Find And Replace in String.c
 
 
843. Guess the Word.c
 
 
85. Maximal Rectangle.c
 
 
857. Minimum Cost to Hire K Workers.c
 
 
863. All Nodes Distance K in Binary Tree.c
 
 
865. Smallest Subtree with all the Deepest Nodes.c
 
 
88. Merge Sorted Array.c
 
 
89. Gray Code.c
 
 
9. Palindrome Number.c
 
 
90. Subsets II.c
 
 
904. Fruit Into Baskets.c
 
 
91. Decode Ways.c
 
 
911. Online Election.c
 
 
913. Cat and Mouse.c
 
 
920. Number of Music Playlists.c
 
 
926. Flip String to Monotone Increasing.c
 
 
93. Restore IP Addresses.c
 
 
935. Knight Dialer.c
 
 
939. Minimum Area Rectangle.c
 
 
94. Binary Tree Inorder Traversal.c
 
 
943. Find the Shortest Superstring.c
 
 
947. Most Stones Removed with Same Row or Column.c
 
 
958. Check Completeness of a Binary Tree.c
 
 
96. Unique Binary Search Trees.c
 
 
973. K Closest Points to Origin.c
 
 
975. Odd Even Jump.c
 
 
98. Validate Binary Search Tree.c
 
 
986. Interval List Intersections.c
 
 
987. Vertical Order Traversal of a Binary Tree.c
 
 
99. Recover Binary Search Tree.c
 
 
992. Subarrays with K Different Integers.c
 
 
README.md
 
 
elevator.c
 
 
pipe.c
 
 
tool.js
 
 

README.md

My leetcode solutions in C.

Many beat 100% c submissions.

Free for use, no liability, no license is required.

Author: vli02@hotmail.com 8/19/2017

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