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LeetCode前400题Java精美版.pdf
1. Two Sum Easy
2. Add Two Numbers Medium
3. Longest Substring Without Repeating Characters Medium
4. Median of Two Sorted Arrays Hard
5. Longest Palindromic Substring Medium
6. ZigZag Conversion Medium
7. Reverse Integer Easy
8. String to Integer (atoi) Medium
9. Palindrome Number Easy
10. Regular Expression Matching Hard
11. Container With Most Water Medium
12. Integer to Roman Medium
13. Roman to Integer Easy
14. Longest Common Prefix Easy
15. 3Sum Medium
16. 3Sum Closest Medium
17. Letter Combinations of a Phone Number Medium
18. 4Sum Medium
19. Remove Nth Node From End of List Medium
20. Valid Parentheses Easy
21. Merge Two Sorted Lists Easy
22. Generate Parentheses Medium
23. Merge k Sorted Lists Hard
24. Swap Nodes in Pairs Medium
25. Reverse Nodes in k-Group Hard
26. Remove Duplicates from Sorted Array Easy
27. Remove Element Easy
28. Implement strStr() Easy
29. Divide Two Integers Medium
30. Substring with Concatenation of All Words Hard
31. Next Permutation Medium
32. Longest Valid Parentheses Hard
33. Search in Rotated Sorted Array Medium
34. Search for a Range Medium
35. Search Insert Position Easy
36. Valid Sudoku Medium
37. Sudoku Solver Hard
38. Count and Say Easy
39. Combination Sum Medium
40. Combination Sum II Medium
41. First Missing Positive Hard
42. Trapping Rain Water Hard
43. Multiply Strings Medium
44. Wildcard Matching Hard
45. Jump Game II Hard
46. Permutations Medium
47. Permutations II Medium
48. Rotate Image Medium
49. Group Anagrams Medium
50. Pow(x, n) Medium
51. N-Queens Hard
52. N-Queens II Hard
53. Maximum Subarray Easy
54. Spiral Matrix Medium
55. Jump Game Medium
56. Merge Intervals Medium
57. Insert Interval Hard
58. Length of Last Word Easy
59. Spiral Matrix II Medium
60. Permutation Sequence Medium
61. Rotate List Medium
62. Unique Paths Medium
63. Unique Paths II Medium
64. Minimum Path Sum Medium
65. Valid Number Hard
66. Plus One Easy
67. Add Binary Easy
68. Text Justification Hard
69. Sqrt(x) Easy
70. Climbing Stairs Easy
71. Simplify Path Medium
72. Edit Distance Hard
73. Set Matrix Zeroes Medium
74. Search a 2D Matrix Medium
75. Sort Colors Medium
76. Minimum Window Substring Hard
77. Combinations Medium
78. Subsets Medium
79. Word Search Medium
80. Remove Duplicates from Sorted Array II Medium
81. Search in Rotated Sorted Array II Medium
82. Remove Duplicates from Sorted List II Medium
83. Remove Duplicates from Sorted List Easy
84. Largest Rectangle in Histogram Hard
85. Maximal Rectangle Hard
86. Partition List Medium
87. Scramble String Hard
88. Merge Sorted Array Easy
89. Gray Code Medium
90. Subsets II Medium
91. Decode Ways Medium
92. Reverse Linked List II Medium
93. Restore IP Addresses Medium
94. Binary Tree Inorder Traversal Medium
95. Unique Binary Search Trees II Medium
96. Unique Binary Search Trees Medium
97. Interleaving String Hard
98. Validate Binary Search Tree Medium
99. Recover Binary Search Tree Hard
100. Same Tree Easy
101. Symmetric Tree Easy
102. Binary Tree Level Order Traversal Medium
103. Binary Tree Zigzag Level Order Traversal Medium
104. Maximum Depth of Binary Tree Easy
105. Construct Binary Tree from Preorder and Inorder Traversal Medium
106. Construct Binary Tree from Inorder and Postorder Traversal Medium
107. Binary Tree Level Order Traversal II Easy
108. Convert Sorted Array to Binary Search Tree Easy
109. Convert Sorted List to Binary Search Tree Medium
110. Balanced Binary Tree Easy
111. Minimum Depth of Binary Tree Easy
112. Path Sum Easy
113. Path Sum II Medium
114. Flatten Binary Tree to Linked List Medium
115. Distinct Subsequences Hard
116. Populating Next Right Pointers in Each Node Medium
117. Populating Next Right Pointers in Each Node II Medium
118. Pascal's Triangle Easy
119. Pascal's Triangle II Easy
120. Triangle Medium
121. Best Time to Buy and Sell Stock Easy
122. Best Time to Buy and Sell Stock II Easy
123. Best Time to Buy and Sell Stock III Hard
124. Binary Tree Maximum Path Sum Hard
125. Valid Palindrome Easy
126. Word Ladder II Hard
127. Word Ladder Medium
128. Longest Consecutive Sequence Hard
129. Sum Root to Leaf Numbers Medium
130. Surrounded Regions Medium
131. Palindrome Partitioning Medium
132. Palindrome Partitioning II Hard
133. Clone Graph Medium
134. Gas Station Medium
135. Candy Hard
136. Single Number Easy
137. Single Number II Medium
138. Copy List with Random Pointer Medium
139. Word Break Medium
140. Word Break II Hard
141. Linked List Cycle Easy
142. Linked List Cycle II Medium
143. Reorder List Medium
144. Binary Tree Preorder Traversal Medium
145. Binary Tree Postorder Traversal Hard
146. LRU Cache Hard
147. Insertion Sort List Medium
148. Sort List Medium
149. Max Points on a Line Hard
150. Evaluate Reverse Polish Notation Medium
151. Reverse Words in a String Medium
152. Maximum Product Subarray Medium
153. Find Minimum in Rotated Sorted Array Medium
154. Find Minimum in Rotated Sorted Array II Hard
155. Min Stack Easy
156. Binary Tree Upside Down Medium
157. Read N Characters Given Read4 Medium
158. Read N Characters Given Read4 II - Call multiple times Hard
159. Longest Substring with At Most Two Distinct Characters Hard
160. Intersection of Two Linked Lists Easy
161. One Edit Distance Medium
162. Find Peak Element Medium
163. Missing Ranges Medium
164. Maximum Gap Hard
165. Compare Version Numbers Medium
166. Fraction to Recurring Decimal Medium
167. Two Sum II - Input array is sorted Easy
168. Excel Sheet Column Title Easy
169. Majority Element Easy
170. Two Sum III - Data structure design Easy
171. Excel Sheet Column Number Easy
172. Factorial Trailing Zeroes Easy
173. Binary Search Tree Iterator Medium
174. Dungeon Game Hard
175. Combine Two Tables Easy
176. Second Highest Salary Easy
177. Nth Highest Salary Medium
178. Rank Scores Medium
179. Largest Number Medium
180. Consecutive Numbers Medium
181. Employees Earning More Than Their Managers Easy
182. Duplicate Emails Easy
183. Customers Who Never Order Easy
184. Department Highest Salary Medium
185. Department Top Three Salaries Hard
186. Reverse Words in a String II Medium
187. Repeated DNA Sequences Medium
188. Best Time to Buy and Sell Stock IV Hard
189. Rotate Array Easy
190. Reverse Bits Easy
191. Number of 1 Bits Easy
192. Word Frequency Medium
193. Valid Phone Numbers Easy
194. Transpose File Medium
195. Tenth Line Easy
196. Delete Duplicate Emails Easy
197. Rising Temperature Easy
198. House Robber Easy
199. Binary Tree Right Side View Medium
200. Number of Islands Medium
201. Bitwise AND of Numbers Range Medium
202. Happy Number Easy
203. Remove Linked List Elements Easy
204. Count Primes Easy
205. Isomorphic Strings Easy
206. Reverse Linked List Easy
207. Course Schedule Medium
208. Implement Trie (Prefix Tree) Medium
209. Minimum Size Subarray Sum Medium
210. Course Schedule II Medium
211. Add and Search Word - Data structure design Medium
212. Word Search II Hard
213. House Robber II Medium
214. Shortest Palindrome Hard
215. Kth Largest Element in an Array Medium
216. Combination Sum III Medium
217. Contains Duplicate Easy
218. The Skyline Problem Hard
219. Contains Duplicate II Easy
220. Contains Duplicate III Medium
221. Maximal Square Medium
222. Count Complete Tree Nodes Medium
223. Rectangle Area Medium
224. Basic Calculator Hard
225. Implement Stack using Queues Easy
226. Invert Binary Tree Easy
227. Basic Calculator II Medium
228. Summary Ranges Medium
229. Majority Element II Medium
230. Kth Smallest Element in a BST Medium
231. Power of Two Easy
232. Implement Queue using Stacks Easy
233. Number of Digit One Hard
234. Palindrome Linked List Easy
235. Lowest Common Ancestor of a Binary Search Tree Easy
236. Lowest Common Ancestor of a Binary Tree Medium
237. Delete Node in a Linked List Easy
238. Product of Array Except Self Medium
239. Sliding Window Maximum Hard
240. Search a 2D Matrix II Medium
241. Different Ways to Add Parentheses Medium
242. Valid Anagram Easy
243. Shortest Word Distance Easy
244. Shortest Word Distance II Medium
245. Shortest Word Distance III Medium
246. Strobogrammatic Number Easy
247. Strobogrammatic Number II Medium
248. Strobogrammatic Number III Hard
249. Group Shifted Strings Medium
250. Count Univalue Subtrees Medium
251. Flatten 2D Vector Medium
252. Meeting Rooms Easy
253. Meeting Rooms II Medium
254. Factor Combinations Medium
255. Verify Preorder Sequence in Binary Search Tree Medium
256. Paint House Easy
257. Binary Tree Paths Easy
258. Add Digits Easy
259. 3Sum Smaller Medium
260. Single Number III Medium
261. Graph Valid Tree Medium
262. Trips and Users Hard
263. Ugly Number Easy
264. Ugly Number II Medium
265. Paint House II Hard
266. Palindrome Permutation Easy
267. Palindrome Permutation II Medium
268. Missing Number Easy
269. Alien Dictionary Hard
270. Closest Binary Search Tree Value Easy
271. Encode and Decode Strings Medium
272. Closest Binary Search Tree Value II Hard
273. Integer to English Words Hard
274. H-Index Medium
275. H-Index II Medium
276. Paint Fence Easy
277. Find the Celebrity Medium
278. First Bad Version Easy
279. Perfect Squares Medium
280. Wiggle Sort Medium
281. Zigzag Iterator Medium
282. Expression Add Operators Hard
283. Move Zeroes Easy
284. Peeking Iterator Medium
285. Inorder Successor in BST Medium
286. Walls and Gates Medium
287. Find the Duplicate Number Medium
288. Unique Word Abbreviation Medium
289. Game of Life Medium
290. Word Pattern Easy
291. Word Pattern II Hard
292. Nim Game Easy
293. Flip Game Easy
294. Flip Game II Medium
295. Find Median from Data Stream Hard
296. Best Meeting Point Hard
297. Serialize and Deserialize Binary Tree Hard
298. Binary Tree Longest Consecutive Sequence Medium
299. Bulls and Cows Medium
300. Longest Increasing Subsequence Medium
301. Remove Invalid Parentheses Hard
302. Smallest Rectangle Enclosing Black Pixels Hard
303. Range Sum Query - Immutable Easy
304. Range Sum Query 2D - Immutable Medium
305. Number of Islands II Hard
306. Additive Number Medium
307. Range Sum Query - Mutable Medium
308. Range Sum Query 2D - Mutable Medium
309. Best Time to Buy and Sell Stock with Cooldown Medium
310. Minimum Height Trees Medium
311. Sparse Matrix Multiplication Medium
312. Burst Balloons Hard
313. Super Ugly Number Medium
314. Binary Tree Vertical Order Traversal Medium
315. Count of Smaller Numbers After Self Hard
316. Remove Duplicate Letters Hard
317. Shortest Distance from All Buildings Hard
318. Maximum Product of Word Lengths Medium
319. Bulb Switcher Medium
320. Generalized Abbreviation Medium
321. Create Maximum Number Hard
322. Coin Change Medium
323. Number of Connected Components in an Undirected Graph Medium
324. Wiggle Sort II Medium
325. Maximum Size Subarray Sum Equals k Medium
326. Power of Three Easy
327. Count of Range Sum Hard
328. Odd Even Linked List Medium
329. Longest Increasing Path in a Matrix Hard
330. Patching Array Hard
331. Verify Preorder Serialization of a Binary Tree Medium
332. Reconstruct Itinerary Medium
333. Largest BST Subtree Medium
334. Increasing Triplet Subsequence Medium
335. Self Crossing Hard
336. Palindrome Pairs Hard
337. House Robber III Medium
338. Counting Bits Medium
339. Nested List Weight Sum Easy
340. Longest Substring with At Most K Distinct Characters Hard
341. Flatten Nested List Iterator Medium
342. Power of Four Easy
343. Integer Break Medium
344. Reverse String Easy
345. Reverse Vowels of a String Easy
346. Moving Average from Data Stream Easy
347. Top K Frequent Elements Medium
348. Design Tic-Tac-Toe Medium
349. Intersection of Two Arrays Easy
350. Intersection of Two Arrays II Easy
351. Android Unlock Patterns Medium
352. Data Stream as Disjoint Intervals Hard
353. Design Snake Game Medium
354. Russian Doll Envelopes Hard
355. Design Twitter Medium
356. Line Reflection Medium
357. Count Numbers with Unique Digits Medium
358. Rearrange String k Distance Apart Hard
359. Logger Rate Limiter Easy
360. Sort Transformed Array Medium
361. Bomb Enemy Medium
362. Design Hit Counter Medium
363. Max Sum of Rectangle No Larger Than K Hard
364. Nested List Weight Sum II Medium
365. Water and Jug Problem Medium
366. Find Leaves of Binary Tree Medium
367. Valid Perfect Square Easy
368. Largest Divisible Subset Medium
369. Plus One Linked List Medium
370. Range Addition Medium
371. Sum of Two Integers Easy
372. Super Pow Medium
373. Find K Pairs with Smallest Sums Medium
374. Guess Number Higher or Lower Easy
375. Guess Number Higher or Lower II Medium
376. Wiggle Subsequence Medium
377. Combination Sum IV Medium
378. Kth Smallest Element in a Sorted Matrix Medium
379. Design Phone Directory Medium
380. Insert Delete GetRandom O(1) Medium
381. Insert Delete GetRandom O(1) - Duplicates allowed Hard
382. Linked List Random Node Medium
383. Ransom Note Easy
384. Shuffle an Array Medium
385. Mini Parser Medium
386. Lexicographical Numbers Medium
387. First Unique Character in a String Easy
388. Longest Absolute File Path Medium
389. Find the Difference Easy
390. Elimination Game Medium
391. Perfect Rectangle Hard
392. Is Subsequence Medium
393. UTF-8 Validation Medium
394. Decode String Medium
395. Longest Substring with At Least K Repeating Characters Medium
396. Rotate Function Medium
397. Integer Replacement Medium
398. Random Pick Index Medium
399. Evaluate Division Medium
400. Nth Digit Easy
LEETCODE 题目精选
Selected Solutions
1.00
Felomeng
Contents
1.
Two Sum Easy ..................................................................................................................... 1
2. Add Two Numbers Medium ................................................................................................ 1
3.
Longest Substring Without Repeating Characters Medium ............................................... 2
4. Median of Two Sorted Arrays Hard ..................................................................................... 2
5.
6.
Longest Palindromic Substring Medium ............................................................................. 3
ZigZag Conversion Medium ................................................................................................. 4
7. Reverse Integer Easy .......................................................................................................... 4
8.
String to Integer (atoi) Medium .......................................................................................... 5
9. Palindrome Number Easy ................................................................................................... 6
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Regular Expression Matching Hard ................................................................................. 6
Container With Most Water Medium ............................................................................. 8
Integer to Roman Medium .............................................................................................. 8
Roman to Integer Easy ................................................................................................. 10
Longest Common Prefix Easy ....................................................................................... 10
3Sum Medium ............................................................................................................... 11
3Sum Closest Medium .................................................................................................. 11
Letter Combinations of a Phone Number Medium ....................................................... 12
4Sum Medium ............................................................................................................... 13
Remove Nth Node From End of List Medium ............................................................... 14
Valid Parentheses Easy ................................................................................................. 14
21. Merge Two Sorted Lists Easy ........................................................................................ 14
22.
Generate Parentheses Medium .................................................................................... 15
23. Merge k Sorted Lists Hard ............................................................................................. 15
Swap Nodes in Pairs Medium ........................................................................................ 16
Reverse Nodes in k-Group Hard .................................................................................... 16
Remove Duplicates from Sorted Array Easy ................................................................. 17
i
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
Remove Element Easy .................................................................................................. 17
Implement strStr() Easy ................................................................................................. 18
Divide Two Integers Medium ........................................................................................ 18
Substring with Concatenation of All Words Hard ......................................................... 19
Next Permutation Medium ........................................................................................... 20
Longest Valid Parentheses Hard .................................................................................... 20
Search in Rotated Sorted Array Medium ...................................................................... 21
Search for a Range Medium .......................................................................................... 21
Search Insert Position Easy ........................................................................................... 22
Valid Sudoku Medium ................................................................................................... 23
Sudoku Solver Hard ....................................................................................................... 23
Count and Say Easy ....................................................................................................... 24
Combination Sum Medium ........................................................................................... 25
Combination Sum II Medium ........................................................................................ 26
First Missing Positive Hard ............................................................................................ 26
Trapping Rain Water Hard ............................................................................................. 27
43. Multiply Strings Medium ............................................................................................... 28
44. Wildcard Matching Hard ............................................................................................... 28
45.
46.
47.
48.
49.
50.
51.
52.
Jump Game II Hard ........................................................................................................ 29
Permutations Medium .................................................................................................. 29
Permutations II Medium ............................................................................................... 30
Rotate Image Medium .................................................................................................. 31
Group Anagrams Medium ............................................................................................. 31
Pow(x, n) Medium ......................................................................................................... 32
N-Queens Hard .............................................................................................................. 32
N-Queens II Hard ........................................................................................................... 33
53. Maximum Subarray Easy .............................................................................................. 34
54.
55.
Spiral Matrix Medium ................................................................................................... 35
Jump Game Medium ..................................................................................................... 36
56. Merge Intervals Medium ............................................................................................... 36
ii
57.
58.
59.
60.
61.
62.
63.
Insert Interval Hard ....................................................................................................... 37
Length of Last Word Easy ............................................................................................. 38
Spiral Matrix II Medium................................................................................................. 39
Permutation Sequence Medium ................................................................................... 39
Rotate List Medium ....................................................................................................... 40
Unique Paths Medium .................................................................................................. 40
Unique Paths II Medium ................................................................................................ 41
64. Minimum Path Sum Medium ........................................................................................ 42
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
Valid Number Hard ........................................................................................................ 42
Plus One Easy ................................................................................................................ 43
Add Binary Easy ............................................................................................................ 43
Text Justification Hard ................................................................................................... 44
Sqrt(x) Easy ................................................................................................................... 45
Climbing Stairs Easy ...................................................................................................... 45
Simplify Path Medium ................................................................................................... 45
Edit Distance Hard ......................................................................................................... 46
Set Matrix Zeroes Medium ............................................................................................ 46
Search a 2D Matrix Medium ......................................................................................... 47
Sort Colors Medium ...................................................................................................... 48
76. Minimum Window Substring Hard ................................................................................ 48
77.
78.
Combinations Medium .................................................................................................. 49
Subsets Medium ............................................................................................................ 49
79. Word Search Medium ................................................................................................... 50
80.
81.
82.
83.
84.
Remove Duplicates from Sorted Array II Medium ........................................................ 51
Search in Rotated Sorted Array II Medium ................................................................... 51
Remove Duplicates from Sorted List II Medium ........................................................... 52
Remove Duplicates from Sorted List Easy .................................................................... 52
Largest Rectangle in Histogram Hard ............................................................................ 52
85. Maximal Rectangle Hard ............................................................................................... 54
86.
Partition List Medium .................................................................................................... 55
iii
87.
Scramble String Hard ..................................................................................................... 55
88. Merge Sorted Array Easy .............................................................................................. 56
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
Gray Code Medium ....................................................................................................... 57
Subsets II Medium ......................................................................................................... 57
Decode Ways Medium .................................................................................................. 58
Reverse Linked List II Medium ...................................................................................... 58
Restore IP Addresses Medium ...................................................................................... 59
Binary Tree Inorder Traversal Medium ......................................................................... 59
Unique Binary Search Trees II Medium ......................................................................... 60
Unique Binary Search Trees Medium ............................................................................ 61
Interleaving String Hard ................................................................................................ 61
Validate Binary Search Tree Medium ............................................................................ 62
Recover Binary Search Tree Hard .................................................................................. 62
100.
Same Tree Easy ............................................................................................................. 63
101.
Symmetric Tree Easy .................................................................................................... 63
102. Binary Tree Level Order Traversal Medium .................................................................. 64
103. Binary Tree Zigzag Level Order Traversal Medium ....................................................... 65
104. Maximum Depth of Binary Tree Easy ........................................................................... 66
105. Construct Binary Tree from Preorder and Inorder Traversal Medium ......................... 66
106. Construct Binary Tree from Inorder and Postorder Traversal Medium ........................ 67
107. Binary Tree Level Order Traversal II Easy ..................................................................... 67
108. Convert Sorted Array to Binary Search Tree Easy ........................................................ 68
109. Convert Sorted List to Binary Search Tree Medium ...................................................... 68
110. Balanced Binary Tree Easy ............................................................................................ 69
111. Minimum Depth of Binary Tree Easy ............................................................................ 69
112. Path Sum Easy .............................................................................................................. 70
113. Path Sum II Medium ...................................................................................................... 70
114.
Flatten Binary Tree to Linked List Medium ................................................................... 71
115. Distinct Subsequences Hard .......................................................................................... 72
116. Populating Next Right Pointers in Each Node Medium ................................................ 72
iv
117. Populating Next Right Pointers in Each Node II Medium.............................................. 73
118. Pascal's Triangle Easy ................................................................................................... 74
119. Pascal's Triangle II Easy................................................................................................. 75
120.
Triangle Medium ........................................................................................................... 75
121. Best Time to Buy and Sell Stock Easy ........................................................................... 76
122. Best Time to Buy and Sell Stock II Easy ........................................................................ 76
123. Best Time to Buy and Sell Stock III Hard ........................................................................ 77
124. Binary Tree Maximum Path Sum Hard .......................................................................... 77
125. Valid Palindrome Easy .................................................................................................. 78
126. Word Ladder II Hard ...................................................................................................... 79
127. Word Ladder Medium ................................................................................................... 80
128.
Longest Consecutive Sequence Hard ............................................................................ 82
129.
Sum Root to Leaf Numbers Medium ............................................................................. 82
130.
Surrounded Regions Medium ....................................................................................... 83
131. Palindrome Partitioning Medium .................................................................................. 84
132. Palindrome Partitioning II Hard ..................................................................................... 85
133. Clone Graph Medium .................................................................................................... 85
134. Gas Station Medium ....................................................................................................... 86
135. Candy Hard ..................................................................................................................... 87
136.
Single Number Easy ....................................................................................................... 88
137.
Single Number II Medium .............................................................................................. 88
138. Copy List with Random Pointer Medium ....................................................................... 89
139. Word Break Medium ...................................................................................................... 90
140. Word Break II Hard ......................................................................................................... 90
141.
Linked List Cycle Easy ..................................................................................................... 92
142.
Linked List Cycle II Medium ............................................................................................ 92
143. Reorder List Medium ...................................................................................................... 92
144. Binary Tree Preorder Traversal Medium ........................................................................ 93
145. Binary Tree Postorder Traversal Hard ............................................................................ 94
146.
LRU Cache Hard .............................................................................................................. 94
v
147.
Insertion Sort List Medium ............................................................................................. 95
148.
Sort List Medium ........................................................................................................... 96
149. Max Points on a Line Hard ............................................................................................. 96
150.
Evaluate Reverse Polish Notation Medium ................................................................... 97
151. Reverse Words in a String Medium ............................................................................... 97
152. Maximum Product Subarray Medium ........................................................................... 99
153.
Find Minimum in Rotated Sorted Array Medium ......................................................... 99
154.
Find Minimum in Rotated Sorted Array II Hard ............................................................ 99
155. Min Stack Easy ............................................................................................................ 100
156. Binary Tree Upside Down Medium ............................................................................. 101
157. Read N Characters Given Read4 Medium .................................................................... 102
158. Read N Characters Given Read4 II - Call multiple times Hard ..................................... 102
159.
Longest Substring with At Most Two Distinct Characters Hard .................................. 103
160.
Intersection of Two Linked Lists Easy ......................................................................... 104
161. One Edit Distance Medium ......................................................................................... 104
162.
Find Peak Element Medium ........................................................................................ 105
163. Missing Ranges Medium ............................................................................................. 105
164. Maximum Gap Hard .................................................................................................... 106
165. Compare Version Numbers Medium .......................................................................... 106
166.
Fraction to Recurring Decimal Medium ...................................................................... 107
167.
Two Sum II - Input array is sorted Easy ...................................................................... 107
168.
Excel Sheet Column Title Easy .................................................................................... 108
169. Majority Element Easy ................................................................................................ 108
170.
Two Sum III - Data structure design Easy ................................................................... 109
171.
Excel Sheet Column Number Easy .............................................................................. 109
172.
Factorial Trailing Zeroes Easy ..................................................................................... 110
173. Binary Search Tree Iterator Medium .......................................................................... 110
174. Dungeon Game Hard ..................................................................................................... 111
175. Combine Two Tables Easy .......................................................................................... 111
176.
Second Highest Salary Easy ........................................................................................ 112
vi
177. Nth Highest Salary Medium ......................................................................................... 113
178. Rank Scores Medium .................................................................................................... 114
179.
Largest Number Medium ............................................................................................. 114
180. Consecutive Numbers Medium .................................................................................... 115
181.
Employees Earning More Than Their Managers Easy ................................................. 115
182. Duplicate Emails Easy .................................................................................................. 116
183. Customers Who Never Order Easy .............................................................................. 117
184. Department Highest Salary Medium ............................................................................ 118
185. Department Top Three Salaries Hard ........................................................................... 118
186. Reverse Words in a String II Medium ........................................................................... 120
187. Repeated DNA Sequences Medium ............................................................................. 120
188. Best Time to Buy and Sell Stock IV Hard....................................................................... 121
189. Rotate Array Easy ........................................................................................................ 121
190. Reverse Bits Easy ......................................................................................................... 122
191. Number of 1 Bits Easy .................................................................................................. 122
192. Word Frequency Medium ............................................................................................ 122
193. Valid Phone Numbers Easy .......................................................................................... 123
194.
Transpose File Medium ................................................................................................ 123
195.
Tenth Line Easy ............................................................................................................ 124
196. Delete Duplicate Emails Easy ....................................................................................... 125
197. Rising Temperature Easy ............................................................................................. 125
198. House Robber Easy ...................................................................................................... 126
199. Binary Tree Right Side View Medium ........................................................................... 126
200. Number of Islands Medium .......................................................................................... 127
201. Bitwise AND of Numbers Range Medium .................................................................... 128
202. Happy Number Easy ................................................................................................... 128
203. Remove Linked List Elements Easy ............................................................................. 129
204. Count Primes Easy ...................................................................................................... 129
205.
Isomorphic Strings Easy .............................................................................................. 130
206. Reverse Linked List Easy ............................................................................................. 130
vii
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