1 | Two Sum | 49.3% | 简单 | HashMap |
---|---|---|---|---|
2 | Add Two Numbers | 38.1% | 适中 | 数组相关 |
3 | Longest Substring Without Repeating Characters | 35.4% | 适中 | HashMap |
4 | Median of Two Sorted Arrays | 38.6% | 困难 | 难且重要 |
5 | Longest Palindromic Substring | 31.6% | 适中 | Palindrome |
6 | ZigZag Conversion | 48.6% | 适中 | 不重要 |
7 | Reverse Integer | 34.6% | 简单 | 基础 |
8 | String to Integer (atoi) | 20.9% | 适中 | 基础 |
9 | Palindrome Number | 58.5% | 简单 | Palindrome |
10 | Regular Expression Matching | 30.2% | 困难 | 超难 |
11 | Container With Most Water | 64% | 适中 | 双向双指针 |
12 | Integer to Roman | 64.2% | 适中 | 实现题 |
13 | Roman to Integer | 62% | 简单 | 实现题 |
14 | Longest Common Prefix | 38.6% | 简单 | Java基础 |
15 | 3Sum | 29.1% | 适中 | 求和 |
16 | 3Sum Closest | 45.8% | 适中 | 双向双指针 |
17 | Letter Combinations of a Phone Number | 54.3% | 适中 | 实现题 |
18 | 4Sum | 38.3% | 适中 | 求和 |
19 | Remove Nth Node From End of List | 39.3% | 适中 | 删除 |
20 | Valid Parentheses | 42.8% | 简单 | 平衡符号 |
21 | Merge Two Sorted Lists | 64% | 简单 | 数组相关 |
22 | Generate Parentheses | 76% | 适中 | Parentheses |
23 | Merge k Sorted Lists | 52.8% | 困难 | 数组相关&PriorityQueue |
24 | Swap Nodes in Pairs | 66.5% | 适中 | 基础操作 |
25 | Reverse Nodes in k-Group | 62.6% | 困难 | 反转 |
26 | Remove Duplicates from Sorted Array | 51.4% | 简单 | 单向双指针 |
27 | Remove Element | 58.6% | 简单 | 单向双指针 |
28 | Implement strStr() | 39.7% | 简单 | Java基础 |
29 | Divide Two Integers | 20.1% | 适中 | 加减乘除 |
30 | Substring with Concatenation of All Words | 31.6% | 困难 | Substring&Sliding Window |
31 | Next Permutation | 34.4% | 适中 | 排列&规律 |
32 | Longest Valid Parentheses | 33.6% | 困难 | Parentheses |
33 | Search in Rotated Sorted Array | 38.5% | 适中 | 旋转 |
34 | Find First and Last Position of Element in Sorted Array | 40.2% | 适中 | 基础 |
35 | Search Insert Position | 46.6% | 简单 | 基础 |
36 | Valid Sudoku | 60.5% | 适中 | 特殊 |
37 | Sudoku Solver | 62.4% | 困难 | 特殊 |
38 | Count and Say | 56.2% | 适中 | 实现题 |
39 | Combination Sum | 69.5% | 适中 | 组合 |
40 | Combination Sum II | 62.5% | 适中 | 组合 |
41 | First Missing Positive | 40.2% | 困难 | 交换 |
42 | Trapping Rain Water | 52.3% | 困难 | 双向双指针 |
43 | Multiply Strings | 44.5% | 适中 | 加减乘除 |
44 | Wildcard Matching | 31.2% | 困难 | 超难 |
45 | Jump Game II | 37.4% | 适中 | 基础 |
46 | Permutations | 76.7% | 适中 | 排列 |
47 | Permutations II | 59.6% | 适中 | 排列 |
48 | Rotate Image | 69.2% | 适中 | 二维数组 |
49 | Group Anagrams | 63.1% | 适中 | Group&Anagram |
50 | Pow(x, n) | 36.4% | 适中 | 开方 |
51 | N-Queens | 70.7% | 困难 | 极难 |
52 | N-Queens II | 79.2% | 困难 | 极难 |
53 | Maximum Subarray | 52.1% | 简单 | 一维 |
54 | Spiral Matrix | 41% | 适中 | 二维数组 |
55 | Jump Game | 40.9% | 适中 | 基础 |
56 | Merge Intervals | 42.9% | 适中 | 区间问题 |
57 | Insert Interval | 37.5% | 适中 | 区间问题 |
58 | Length of Last Word | 33.6% | 简单 | Java基础 |
59 | Spiral Matrix II | 78% | 适中 | 二维数组 |
60 | Permutation Sequence | 49.1% | 困难 | 排列&规律 |
61 | Rotate List | 40.6% | 适中 | 基础操作 |
62 | Unique Paths | 61.8% | 适中 | 网格问题 |
63 | Unique Paths II | 36.6% | 适中 | 网格问题 |
64 | Minimum Path Sum | 67.5% | 适中 | 网格问题 |
65 | Valid Number | 20.6% | 困难 | 难 |
66 | Plus One | 45.1% | 简单 | 加减乘除 |
67 | Add Binary | 54.4% | 简单 | 加减乘除 |
68 | Text Justification | 44.3% | 困难 | 极难 |
69 | Sqrt(x) | 38.8% | 简单 | 开方 |
70 | Climbing Stairs | 50.3% | 简单 | 网格问题 |
71 | Simplify Path | 40.4% | 适中 | 压栈匹配 |
72 | Edit Distance | 59.7% | 困难 | 匹配问题 |
73 | Set Matrix Zeroes | 55.8% | 适中 | 二维数组 |
74 | Search a 2D Matrix | 38.7% | 适中 | 二维数组 |
75 | Sort Colors | 55.3% | 适中 | 荷兰国旗 |
76 | Minimum Window Substring | 38.8% | 困难 | Substring&Sliding Window |
77 | Combinations | 74.5% | 适中 | 组合 |
78 | Subsets | 77.8% | 适中 | 子集&位运算 |
79 | Word Search | 42.3% | 适中 | Flood Fill |
80 | Remove Duplicates from Sorted Array II | 56.2% | 适中 | 单向双指针 |
81 | Search in Rotated Sorted Array II | 35.8% | 适中 | 旋转 |
82 | Remove Duplicates from Sorted List II | 48.9% | 适中 | 删除 |
83 | Remove Duplicates from Sorted List | 51.3% | 简单 | 删除 |
84 | Largest Rectangle in Histogram | 41.4% | 困难 | 迭代极值 |
85 | Maximal Rectangle | 47.6% | 困难 | 迭代极值 |
86 | Partition List | 59.3% | 适中 | 基础操作 |
87 | Scramble String | 47.2% | 困难 | 计数排序 |
88 | Merge Sorted Array | 48.4% | 简单 | 合并排序 |
89 | Gray Code | 68.7% | 适中 | 不重要 |
90 | Subsets II | 60.7% | 适中 | 子集 |
91 | Decode Ways | 24.3% | 适中 | 匹配问题 |
92 | Reverse Linked List II | 51.1% | 适中 | 反转 |
93 | Restore IP Addresses | 49.2% | 适中 | 不重要 |
94 | Binary Tree Inorder Traversal | 72.5% | 简单 | 基础 |
95 | Unique Binary Search Trees II | 66.6% | 适中 | 不重要 |
96 | Unique Binary Search Trees | 69.1% | 适中 | 结合 |
97 | Interleaving String | 45.2% | 适中 | 匹配问题 |
98 | Validate Binary Search Tree | 32.2% | 适中 | 双Pre |
99 | Recover Binary Search Tree | 62.1% | 困难 | BST&Inorder |
100 | Same Tree | 60.1% | 简单 | 双Pre |
101 | Symmetric Tree | 52.8% | 简单 | 双Pre |
102 | Binary Tree Level Order Traversal | 63.2% | 适中 | 基础 |
103 | Binary Tree Zigzag Level Order Traversal | 54.8% | 适中 | BFS |
104 | Maximum Depth of Binary Tree | 74.8% | 简单 | Postorder |
105 | Construct Binary Tree from Preorder and Inorder Traversal | 67.8% | 适中 | 不重要 |
106 | Construct Binary Tree from Inorder and Postorder Traversal | 69.3% | 适中 | 不重要 |
107 | Binary Tree Level Order Traversal II | 66.3% | 适中 | BFS |
108 | Convert Sorted Array to Binary Search Tree | 73.9% | 简单 | BST |
109 | Convert Sorted List to Binary Search Tree | 76.1% | 适中 | BST |
110 | Balanced Binary Tree | 54.5% | 简单 | Postorder |
111 | Minimum Depth of Binary Tree | 43.2% | 简单 | 双Pre |
112 | Path Sum | 51% | 简单 | 双Pre |
113 | Path Sum II | 60.8% | 适中 | Preorder |
114 | Flatten Binary Tree to Linked List | 70.9% | 适中 | 不重要 |
115 | Distinct Subsequences | 48.7% | 困难 | 匹配问题 |
116 | Populating Next Right Pointers in Each Node | 62.2% | 适中 | 难且重要 |
117 | Populating Next Right Pointers in Each Node II | 51.2% | 适中 | 难且重要 |
118 | Pascal’s Triangle | 67.1% | 简单 | 实现题 |
119 | Pascal’s Triangle II | 61.7% | 简单 | 实现题 |
120 | Triangle | 66.7% | 适中 | 一维 |
121 | Best Time to Buy and Sell Stock | 54.8% | 简单 | 实现题 |
122 | Best Time to Buy and Sell Stock II | 62.5% | 简单 | 实现题 |
123 | Best Time to Buy and Sell Stock III | 44.6% | 困难 | 实现题 |
124 | Binary Tree Maximum Path Sum | 43% | 困难 | Postorder |
125 | Valid Palindrome | 46.2% | 简单 | Palindrome |
126 | Word Ladder II | 38.5% | 困难 | 拓扑排序 |
127 | Word Ladder | 43.2% | 困难 | BFS |
128 | Longest Consecutive Sequence | 51.8% | 适中 | 实现题 |
129 | Sum Root to Leaf Numbers | 64.6% | 适中 | 双Pre |
130 | Surrounded Regions | 42.2% | 适中 | FloodFill |
131 | Palindrome Partitioning | 68.7% | 适中 | Palindrome&Backtracking |
132 | Palindrome Partitioning II | 43.4% | 困难 | Palindrome&DP |
133 | Clone Graph | 64.6% | 适中 | 基础 |
134 | Gas Station | 53.9% | 适中 | 数学定理 |
135 | Candy | 44.4% | 困难 | 基础 |
136 | Single Number | 69.6% | 简单 | 异或 |
137 | Single Number II | 67.8% | 适中 | 不重要 |
138 | Copy List with Random Pointer | 55.9% | 适中 | 基础 |
139 | Word Break | 47.4% | 适中 | 字符串问题 |
140 | Word Break II | 38.5% | 困难 | 实现题 |
141 | Linked List Cycle | 49.1% | 简单 | 环 |
142 | Linked List Cycle II | 51.5% | 适中 | 环 |
143 | Reorder List | 56.4% | 适中 | 综合练习 |
144 | Binary Tree Preorder Traversal | 66.5% | 简单 | 基础 |
145 | Binary Tree Postorder Traversal | 72.2% | 简单 | 基础 |
146 | LRU Cache | 50.5% | 适中 | 是否 |
147 | Insertion Sort List | 65% | 适中 | 数组相关 |
148 | Sort List | 66.7% | 适中 | 数组相关 |
149 | Max Points on a Line | 23% | 困难 | 点线 |
150 | Evaluate Reverse Polish Notation | 50.4% | 适中 | 表达式计算 |
151 | Reverse Words in a String | 43.1% | 适中 | 基础 |
152 | Maximum Product Subarray | 40.2% | 适中 | 一维 |
153 | Find Minimum in Rotated Sorted Array | 51.5% | 适中 | 旋转 |
154 | Find Minimum in Rotated Sorted Array II | 50.1% | 困难 | 旋转 |
155 | Min Stack | 55.1% | 简单 | 应用 |
156 | Binary Tree Upside Down | 74.5% | 适中 | 不重要 |
157 | Read N Characters Given Read4 | 51.1% | 简单 | 实现题 |
158 | Read N Characters Given Read4 II - Call multiple times | 55.3% | 困难 | 实现题 |
159 | Longest Substring with At Most Two Distinct Characters | 51.8% | 适中 | Substring&Sliding Window |
160 | Intersection of Two Linked Lists | 56.2% | 简单 | 数组相关 |
161 | One Edit Distance | 33% | 适中 | Java基础 |
162 | Find Peak Element | 47.3% | 适中 | 基础 |
163 | Missing Ranges | 26.2% | 简单 | 对比上一题 |
164 | Maximum Gap | 55.1% | 困难 | 桶排序 |
165 | Compare Version Numbers | 42.6% | 适中 | Java基础 |
167 | Two Sum II - Input array is sorted | 56.5% | 简单 | 基础 |
168 | Excel Sheet Column Title | 38.2% | 简单 | Java基础 |
169 | Majority Element | 64.3% | 简单 | 数学定理 |
170 | Two Sum III - Data structure design | 41% | 简单 | HashMap |
171 | Excel Sheet Column Number | 67.9% | 简单 | Java基础 |
172 | Factorial Trailing Zeroes | 39.9% | 简单 | 特殊 |
173 | Binary Search Tree Iterator | 74.1% | 适中 | BST&Inorder |
174 | Dungeon Game | 48.1% | 困难 | 网格问题 |
179 | Largest Number | 36.9% | 适中 | 不重要 |
186 | Reverse Words in a String II | 73.9% | 适中 | 基础 |
187 | Repeated DNA Sequences | 45.1% | 适中 | Subsequence&HashSet |
188 | Best Time to Buy and Sell Stock IV | 30.2% | 困难 | 实现题 |
189 | Rotate Array | 42.7% | 适中 | 交换 |
190 | Reverse Bits | 60.9% | 简单 | n&1 |
191 | Number of 1 Bits | 69.2% | 简单 | n-1 |
198 | House Robber | 46.5% | 适中 | 实现题 |
199 | Binary Tree Right Side View | 64.2% | 适中 | BFS |
200 | Number of Islands | 50.1% | 适中 | Flood Fill |
201 | Bitwise AND of Numbers Range | 47.1% | 适中 | 不重要 |
202 | Happy Number | 60.5% | 简单 | 不重要 |
203 | Remove Linked List Elements | 46.1% | 简单 | 删除 |
204 | Count Primes | 34.9% | 简单 | 规律 |
205 | Isomorphic Strings | 47.3% | 简单 | 计数排序 |
206 | Reverse Linked List | 70.3% | 简单 | 反转 |
207 | Course Schedule | 54% | 适中 | 拓扑排序 |
208 | Implement Trie (Prefix Tree) | 68.5% | 适中 | 字典树 |
209 | Minimum Size Subarray Sum | 44.4% | 适中 | 子数组 |
210 | Course Schedule II | 51.6% | 适中 | 拓扑排序 |
211 | Design Add and Search Words Data Structure | 46% | 适中 | 字典树 |
212 | Word Search II | 42.3% | 困难 | 字典树 |
213 | House Robber II | 39.3% | 适中 | 实现题 |
214 | Shortest Palindrome | 32.4% | 困难 | Palindrome |
215 | Kth Largest Element in an Array | 64.4% | 适中 | 基础 |
216 | Combination Sum III | 71.7% | 适中 | 组合 |
217 | Contains Duplicate | 52.9% | 简单 | HashSet |
218 | The Skyline Problem | 43.6% | 困难 | 极难 |
219 | Contains Duplicate II | 40.1% | 简单 | HashSet |
220 | Contains Duplicate III | 26.4% | 适中 | TreeSet&桶排序 |
221 | Maximal Square | 42.8% | 适中 | 网格问题 |
222 | Count Complete Tree Nodes | 71.7% | 适中 | 不重要 |
223 | Rectangle Area | 43.6% | 适中 | 不重要 |
224 | Basic Calculator | 38.4% | 困难 | 表达式计算 |
225 | Implement Stack using Queues | 65.5% | 简单 | 应用 |
226 | Invert Binary Tree | 76.3% | 简单 | BFS |
227 | Basic Calculator II | 37% | 适中 | 表达式计算 |
228 | Summary Ranges | 53.5% | 简单 | Sliding Window |
229 | Majority Element II | 43.5% | 适中 | 实现题 |
230 | Kth Smallest Element in a BST | 71.6% | 适中 | BST&Inorder |
231 | Power of Two | 48.5% | 简单 | n-1 |
232 | Implement Queue using Stacks | 64.9% | 简单 | 应用 |
233 | Number of Digit One | 37.1% | 困难 | 不重要 |
234 | Palindrome Linked List | 43.1% | 简单 | 综合练习 |
235 | Lowest Common Ancestor of a Binary Search Tree | 64.8% | 简单 | BST |
236 | Lowest Common Ancestor of a Binary Tree | 65% | 适中 | Postorder |
237 | Delete Node in a Linked List | 82.6% | 简单 | 删除 |
238 | Product of Array Except Self | 70.7% | 适中 | 子数组 |
239 | Sliding Window Maximum | 48.8% | 困难 | Sliding Window&Deque |
240 | Search a 2D Matrix II | 41.8% | 适中 | 二维数组 |
241 | Different Ways to Add Parentheses | 72% | 适中 | Parentheses |
242 | Valid Anagram | 61% | 简单 | Anagram |
243 | Shortest Word Distance | 64.8% | 简单 | 实现题 |
244 | Shortest Word Distance II | 51.6% | 适中 | HashMap |
245 | Shortest Word Distance III | 60.8% | 适中 | 实现题 |
246 | Strobogrammatic Number | 46.5% | 简单 | 实现题 |
247 | Strobogrammatic Number II | 50.8% | 适中 | 实现题 |
248 | Strobogrammatic Number III | 42.1% | 困难 | 实现题 |
249 | Group Shifted Strings | 62% | 适中 | HashMap |
250 | Count Univalue Subtrees | 63.9% | 适中 | Postorder |
251 | Flatten 2D Vector | 53.2% | 适中 | 实现题 |
252 | Meeting Rooms | 54.1% | 简单 | 区间问题 |
253 | Meeting Rooms II | 45.9% | 适中 | 区间问题 |
254 | Factor Combinations | 56.9% | 适中 | 组合 |
255 | Verify Preorder Sequence in Binary Search Tree | 45.5% | 适中 | 不重要 |
256 | Paint House | 57.2% | 适中 | 实现题 |
257 | Binary Tree Paths | 64.8% | 简单 | Preorder |
258 | Add Digits | 67.5% | 简单 | 加减乘除 |
259 | 3Sum Smaller | 55.8% | 适中 | 三指针 |
260 | Single Number III | 73.4% | 适中 | 不重要 |
261 | Graph Valid Tree | 47.7% | 适中 | 并查集 |
263 | Ugly Number | 49.4% | 简单 | 实现题 |
264 | Ugly Number II | 53.6% | 适中 | 实现题 |
265 | Paint House II | 53.8% | 困难 | 实现题 |
266 | Palindrome Permutation | 64.4% | 简单 | Palindrome |
267 | Palindrome Permutation II | 41.6% | 适中 | Palindrome&Backtracking |
268 | Missing Number | 56.7% | 简单 | 异或 |
269 | Alien Dictionary | 33.5% | 困难 | 拓扑排序 |
270 | Closest Binary Search Tree Value | 52% | 简单 | BST |
271 | Encode and Decode Strings | 54% | 适中 | 实现题 |
272 | Closest Binary Search Tree Value II | 61.9% | 困难 | BST&Inorder |
273 | Integer to English Words | 28.4% | 困难 | 实现题 |
274 | H-Index | 38.7% | 适中 | 计数排序 |
275 | H-Index II | 41.6% | 适中 | 基础 |
276 | Paint Fence | 45.6% | 适中 | 实现题 |
277 | Find the Celebrity | 56.6% | 适中 | 实现题 |
278 | First Bad Version | 40.3% | 简单 | 基础 |
279 | Perfect Squares | 57.4% | 适中 | 实现题 |
280 | Wiggle Sort | 68.3% | 适中 | 交换 |
281 | Zigzag Iterator | 74.7% | 适中 | Iterator |
282 | Expression Add Operators | 34% | 困难 | 实现题 |
283 | Move Zeroes | 62% | 简单 | 冒泡排序 |
284 | Peeking Iterator | 71.2% | 适中 | Iterator |
285 | Inorder Successor in BST | 62.2% | 适中 | BST&Inorder |
286 | Walls and Gates | 47.2% | 适中 | Flood Fill |
287 | Find the Duplicate Number | 65.8% | 适中 | 选择排序 |
288 | Unique Word Abbreviation | 33.1% | 适中 | HashMap |
289 | Game of Life | 74.4% | 适中 | 特殊 |
290 | Word Pattern | 43.3% | 简单 | HashMap |
291 | Word Pattern II | 52.6% | 适中 | 不重要 |
292 | Nim Game | 69.4% | 简单 | 不重要 |
293 | Flip Game | 70.6% | 简单 | 实现题 |
294 | Flip Game II | 57.5% | 适中 | 实现题 |
295 | Find Median from Data Stream | 47.6% | 困难 | PriorityQueue |
296 | Best Meeting Point | 59.7% | 困难 | 实现题 |
297 | Serialize and Deserialize Binary Tree | 51.7% | 困难 | BST&Inorder |
298 | Binary Tree Longest Consecutive Sequence | 56.1% | 适中 | Preorder |
299 | Bulls and Cows | 48.3% | 适中 | 计数排序 |
300 | Longest Increasing Subsequence | 45.1% | 适中 | 字符串问题 |
301 | Remove Invalid Parentheses | 47.8% | 困难 | Parentheses&极难 |
302 | Smallest Rectangle Enclosing Black Pixels | 69.4% | 困难 | 二维数组 |
303 | Range Sum Query - Immutable | 62.8% | 简单 | 307,308基础 |
304 | Range Sum Query 2D - Immutable | 45.2% | 适中 | 307,308基础 |
305 | Number of Islands II | 33.5% | 困难 | 并查集 |
306 | Additive Number | 32.3% | 适中 | 不重要 |
307 | Range Sum Query - Mutable | 56.4% | 适中 | 树状数组,线断树 |
308 | Range Sum Query 2D - Mutable | 59.1% | 困难 | 树状数组,线断树 |
309 | Best Time to Buy and Sell Stock with Cooldown | 57% | 适中 | 实现题 |
310 | Minimum Height Trees | 34.4% | 适中 | BFS |
311 | Sparse Matrix Multiplication | 74.7% | 适中 | 不重要 |
312 | Burst Balloons | 66.9% | 困难 | 超难 |
313 | Super Ugly Number | 63.5% | 适中 | 基础 |
314 | Binary Tree Vertical Order Traversal | 54.7% | 适中 | 难且重要 |
315 | Count of Smaller Numbers After Self | 41.3% | 困难 | 递减 |
316 | Remove Duplicate Letters | 40.4% | 适中 | HashMap |
317 | Shortest Distance from All Buildings | 47.5% | 困难 | Flood Fill |
318 | Maximum Product of Word Lengths | 64.4% | 适中 | BitMap |
319 | Bulb Switcher | 46.9% | 适中 | 不重要 |
320 | Generalized Abbreviation | 65.2% | 适中 | 实现题 |
321 | Create Maximum Number | 31% | 困难 | 不重要 |
322 | Coin Change | 40.9% | 适中 | 背包变形 |
323 | Number of Connected Components in an Undirected Graph | 59% | 适中 | 并查集 |
324 | Wiggle Sort II | 35.9% | 适中 | 不重要 |
325 | Maximum Size Subarray Sum Equals k | 49.9% | 适中 | 子数组 |
326 | Power of Three | 47.1% | 简单 | 不重要 |
327 | Count of Range Sum | 35.6% | 困难 | 不重要 |
328 | Odd Even Linked List | 63.1% | 适中 | 基础操作 |
329 | Longest Increasing Path in a Matrix | 46.2% | 困难 | Flood Fill |
330 | Patching Array | 42.4% | 困难 | 基础 |
331 | Verify Preorder Serialization of a Binary Tree | 45.2% | 适中 | 不重要 |
332 | Reconstruct Itinerary | 39% | 适中 | 转换图 |
333 | Largest BST Subtree | 43% | 适中 | 不重要 |
334 | Increasing Triplet Subsequence | 38.9% | 适中 | 选择排序 |
335 | Self Crossing | 33.7% | 困难 | 不重要 |
336 | Palindrome Pairs | 39.6% | 困难 | Palindrome |
337 | House Robber III | 60% | 适中 | Postorder |
338 | Counting Bits | 75.6% | 简单 | 不重要 |
339 | Nested List Weight Sum | 79.1% | 适中 | DFS,BFS |
340 | Longest Substring with At Most K Distinct Characters | 48.2% | 适中 | Substring&Sliding Window |
341 | Flatten Nested List Iterator | 64.2% | 适中 | Stack |
342 | Power of Four | 49.2% | 简单 | 不重要 |
344 | Reverse String | 71.3% | 简单 | 基础 |
345 | Reverse Vowels of a String | 50.5% | 简单 | 基础 |
346 | Moving Average from Data Stream | 68.3% | 简单 | Queue |
347 | Top K Frequent Elements | 60.6% | 适中 | 基础 |
348 | Design Tic-Tac-Toe | 58.1% | 适中 | 实现题 |
349 | Intersection of Two Arrays | 70.4% | 简单 | 基础 |
350 | Intersection of Two Arrays II | 52.5% | 简单 | HashMap |
351 | Android Unlock Patterns | 57% | 适中 | 不重要 |
353 | Design Snake Game | 41% | 适中 | 边界 |
354 | Russian Doll Envelopes | 36.5% | 困难 | 递增 |
355 | Design Twitter | 41.3% | 适中 | 综合 |
356 | Line Reflection | 30.8% | 适中 | 线 |
357 | Count Numbers with Unique Digits | 51.5% | 适中 | 不重要 |
358 | Rearrange String k Distance Apart | 34.3% | 困难 | 基础 |
359 | Logger Rate Limiter | 70.7% | 简单 | HashMap |
360 | Sort Transformed Array | 60.4% | 适中 | 不重要 |
361 | Bomb Enemy | 54.1% | 适中 | 伪DP |
362 | Design Hit Counter | 68% | 适中 | Queue |
363 | Max Sum of Rectangle No Larger Than K | 38% | 困难 | TreeSet |
364 | Nested List Weight Sum II | 70% | 适中 | DFS |
365 | Water and Jug Problem | 35.1% | 适中 | 数学定理 |
366 | Find Leaves of Binary Tree | 74.2% | 适中 | Postorder |
367 | Valid Perfect Square | 43.4% | 简单 | 开方 |
368 | Largest Divisible Subset | 38.2% | 适中 | 不重要 |
369 | Plus One Linked List | 61.8% | 适中 | 数组相关 |
370 | Range Addition | 66.8% | 适中 | 实现题 |
371 | Sum of Two Integers | 55.8% | 适中 | 不重要 |
372 | Super Pow | 43.7% | 适中 | 不重要 |
373 | Find K Pairs with Smallest Sums | 42.9% | 适中 | 基础 |
374 | Guess Number Higher or Lower | 45.3% | 简单 | 基础 |
375 | Guess Number Higher or Lower II | 39.7% | 适中 | 超难 |
376 | Wiggle Subsequence | 42.2% | 适中 | 实现题 |
377 | Combination Sum IV | 42.8% | 适中 | 背包变形 |
378 | Kth Smallest Element in a Sorted Matrix | 62.6% | 适中 | 基础 |
379 | Design Phone Directory | 66.3% | 适中 | Queue |
380 | Insert Delete GetRandom O(1) | 48.8% | 适中 | A&H |
381 | Insert Delete GetRandom O(1) - Duplicates allowed | 38% | 困难 | A&H |
382 | Linked List Random Node | 57.4% | 适中 | 基础 |
383 | Ransom Note | 54.4% | 简单 | 计数排序 |
384 | Shuffle an Array | 53.2% | 适中 | 基础 |
385 | Mini Parser | 39.6% | 适中 | 压栈匹配 |
386 | Lexicographical Numbers | 71.6% | 适中 | 不重要 |
387 | First Unique Character in a String | 46.5% | 简单 | 计数排序 |
388 | Longest Absolute File Path | 47.6% | 适中 | 压栈匹配 |
389 | Find the Difference | 62.6% | 简单 | 异或 |
390 | Elimination Game | 44.6% | 适中 | 不重要 |
391 | Perfect Rectangle | 27% | 困难 | 不重要 |
392 | Is Subsequence | 50.5% | 简单 | Subsequence |
393 | UTF-8 Validation | 38.9% | 适中 | 不重要 |
394 | Decode String | 53% | 适中 | 压栈匹配 |
395 | Longest Substring with At Least K Repeating Characters | 44% | 适中 | Substring&Sliding Window |
396 | Rotate Function | 40.2% | 适中 | 不重要 |
397 | Integer Replacement | 36% | 适中 | 特殊考察 |
398 | Random Pick Index | 62.3% | 适中 | 基础 |
399 | Evaluate Division | 54.9% | 适中 | 转换图 |
400 | Nth Digit | 38% | 适中 | 不重要 |
1 | Two Sum | 49.3% | 简单 | HashMap | 手写过 |
---|---|---|---|---|---|
3 | Longest Substring Without Repeating Characters | 35.4% | 适中 | HashMap | 看过思路 |
5 | Longest Palindromic Substring | 31.6% | 适中 | Palindrome | |
7 | Reverse Integer | 34.6% | 简单 | 基础 | |
8 | String to Integer (atoi) | 20.9% | 适中 | 基础 | |
10 | Regular Expression Matching | 30.2% | 困难 | 超难 | |
12 | Integer to Roman | 64.2% | 适中 | 实现题 | |
13 | Roman to Integer | 62% | 简单 | 实现题 | |
15 | 3Sum | 29.1% | 适中 | 求和 | |
17 | Letter Combinations of a Phone Number | 54.3% | 适中 | 实现题 | |
18 | 4Sum | 38.3% | 适中 | 求和 | |
20 | Valid Parentheses | 42.8% | 简单 | 平衡符号 | |
22 | Generate Parentheses | 76% | 适中 | Parentheses | |
23 | Merge k Sorted Lists | 52.8% | 困难 | 数组相关&PriorityQueue | |
29 | Divide Two Integers | 20.1% | 适中 | 加减乘除 | |
31 | Next Permutation | 34.4% | 适中 | 排列&规律 | |
32 | Longest Valid Parentheses | 33.6% | 困难 | Parentheses | |
33 | Search in Rotated Sorted Array | 38.5% | 适中 | 旋转 | |
34 | Find First and Last Position of Element in Sorted Array | 40.2% | 适中 | 基础 | |
35 | Search Insert Position | 46.6% | 简单 | 基础 | |
36 | Valid Sudoku | 60.5% | 适中 | 特殊 | |
37 | Sudoku Solver | 62.4% | 困难 | 特殊 | |
38 | Count and Say | 56.2% | 适中 | 实现题 | |
39 | Combination Sum | 69.5% | 适中 | 组合 | |
40 | Combination Sum II | 62.5% | 适中 | 组合 | |
43 | Multiply Strings | 44.5% | 适中 | 加减乘除 | |
44 | Wildcard Matching | 31.2% | 困难 | 超难 | |
46 | Permutations | 76.7% | 适中 | 排列 | |
48 | Rotate Image | 69.2% | 适中 | 二维数组 | |
49 | Group Anagrams | 63.1% | 适中 | Group&Anagram | |
50 | Pow(x, n) | 36.4% | 适中 | 开方 | |
51 | N-Queens | 70.7% | 困难 | 极难 | |
52 | N-Queens II | 79.2% | 困难 | 极难 | |
53 | Maximum Subarray | 52.1% | 简单 | 一维 | |
54 | Spiral Matrix | 41% | 适中 | 二维数组 | |
59 | Spiral Matrix II | 78% | 适中 | 二维数组 | |
60 | Permutation Sequence | 49.1% | 困难 | 排列&规律 | |
62 | Unique Paths | 61.8% | 适中 | 网格问题 | |
64 | Minimum Path Sum | 67.5% | 适中 | 网格问题 | |
65 | Valid Number | 20.6% | 困难 | 难 | |
67 | Add Binary | 54.4% | 简单 | 加减乘除 | |
68 | Text Justification | 44.3% | 困难 | 极难 | |
69 | Sqrt(x) | 38.8% | 简单 | 开方 | |
70 | Climbing Stairs | 50.3% | 简单 | 网格问题 | |
71 | Simplify Path | 40.4% | 适中 | 压栈匹配 | |
72 | Edit Distance | 59.7% | 困难 | 匹配问题 | |
74 | Search a 2D Matrix | 38.7% | 适中 | 二维数组 | |
75 | Sort Colors | 55.3% | 适中 | 荷兰国旗 | |
76 | Minimum Window Substring | 38.8% | 困难 | Substring&Sliding Window | |
77 | Combinations | 74.5% | 适中 | 组合 | |
78 | Subsets | 77.8% | 适中 | 子集&位运算 | |
79 | Word Search | 42.3% | 适中 | Flood Fill | |
81 | Search in Rotated Sorted Array II | 35.8% | 适中 | 旋转 | |
82 | Remove Duplicates from Sorted List II | 48.9% | 适中 | 删除 | |
84 | Largest Rectangle in Histogram | 41.4% | 困难 | 迭代极值 | |
85 | Maximal Rectangle | 47.6% | 困难 | 迭代极值 | |
88 | Merge Sorted Array | 48.4% | 简单 | 合并排序 | |
90 | Subsets II | 60.7% | 适中 | 子集 | |
91 | Decode Ways | 24.3% | 适中 | 匹配问题 | |
96 | Unique Binary Search Trees | 69.1% | 适中 | 结合 | |
98 | Validate Binary Search Tree | 32.2% | 适中 | 双Pre | |
101 | Symmetric Tree | 52.8% | 简单 | 双Pre | |
104 | Maximum Depth of Binary Tree | 74.8% | 简单 | Postorder | |
108 | Convert Sorted Array to Binary Search Tree | 73.9% | 简单 | BST | |
110 | Balanced Binary Tree | 54.5% | 简单 | Postorder | |
111 | Minimum Depth of Binary Tree | 43.2% | 简单 | 双Pre | |
112 | Path Sum | 51% | 简单 | 双Pre | |
113 | Path Sum II | 60.8% | 适中 | Preorder | |
115 | Distinct Subsequences | 48.7% | 困难 | 匹配问题 | |
116 | Populating Next Right Pointers in Each Node | 62.2% | 适中 | 难且重要 | |
117 | Populating Next Right Pointers in Each Node II | 51.2% | 适中 | 难且重要 | |
124 | Binary Tree Maximum Path Sum | 43% | 困难 | Postorder | |
125 | Valid Palindrome | 46.2% | 简单 | Palindrome | |
126 | Word Ladder II | 38.5% | 困难 | 拓扑排序 | |
127 | Word Ladder | 43.2% | 困难 | BFS | |
130 | Surrounded Regions | 42.2% | 适中 | FloodFill | |
133 | Clone Graph | 64.6% | 适中 | 基础 | |
138 | Copy List with Random Pointer | 55.9% | 适中 | 基础 | |
139 | Word Break | 47.4% | 适中 | 字符串问题 | |
140 | Word Break II | 38.5% | 困难 | 实现题 | |
142 | Linked List Cycle II | 51.5% | 适中 | 环 | |
149 | Max Points on a Line | 23% | 困难 | 点线 | |
150 | Evaluate Reverse Polish Notation | 50.4% | 适中 | 表达式计算 | |
152 | Maximum Product Subarray | 40.2% | 适中 | 一维 | |
153 | Find Minimum in Rotated Sorted Array | 51.5% | 适中 | 旋转 | |
154 | Find Minimum in Rotated Sorted Array II | 50.1% | 困难 | 旋转 | |
155 | Min Stack | 55.1% | 简单 | 应用 | |
157 | Read N Characters Given Read4 | 51.1% | 简单 | 实现题 | |
158 | Read N Characters Given Read4 II - Call multiple times | 55.3% | 困难 | 实现题 | |
161 | One Edit Distance | 33% | 适中 | Java基础 | |
162 | Find Peak Element | 47.3% | 适中 | 基础 | |
163 | Missing Ranges | 26.2% | 简单 | 对比上一题 | |
168 | Excel Sheet Column Title | 38.2% | 简单 | Java基础 | |
171 | Excel Sheet Column Number | 67.9% | 简单 | Java基础 | |
173 | Binary Search Tree Iterator | 74.1% | 适中 | BST&Inorder | |
174 | Dungeon Game | 48.1% | 困难 | 网格问题 | |
191 | Number of 1 Bits | 69.2% | 简单 | n-1 | |
198 | House Robber | 46.5% | 适中 | 实现题 | |
200 | Number of Islands | 50.1% | 适中 | Flood Fill | |
201 | Bitwise AND of Numbers Range | 47.1% | 适中 | 不重要 | |
202 | Happy Number | 60.5% | 简单 | 不重要 | |
204 | Count Primes | 34.9% | 简单 | 规律 | |
207 | Course Schedule | 54% | 适中 | 拓扑排序 | |
208 | Implement Trie (Prefix Tree) | 68.5% | 适中 | 字典树 | |
209 | Minimum Size Subarray Sum | 44.4% | 适中 | 子数组 | |
210 | Course Schedule II | 51.6% | 适中 | 拓扑排序 | |
211 | Design Add and Search Words Data Structure | 46% | 适中 | 字典树 | |
212 | Word Search II | 42.3% | 困难 | 字典树 | |
213 | House Robber II | 39.3% | 适中 | 实现题 | |
214 | Shortest Palindrome | 32.4% | 困难 | Palindrome | |
215 | Kth Largest Element in an Array | 64.4% | 适中 | 基础 | |
216 | Combination Sum III | 71.7% | 适中 | 组合 | |
218 | The Skyline Problem | 43.6% | 困难 | 极难 | |
221 | Maximal Square | 42.8% | 适中 | 网格问题 | |
224 | Basic Calculator | 38.4% | 困难 | 表达式计算 | |
225 | Implement Stack using Queues | 65.5% | 简单 | 应用 | |
226 | Invert Binary Tree | 76.3% | 简单 | BFS | |
227 | Basic Calculator II | 37% | 适中 | 表达式计算 | |
228 | Summary Ranges | 53.5% | 简单 | Sliding Window | |
230 | Kth Smallest Element in a BST | 71.6% | 适中 | BST&Inorder | |
231 | Power of Two | 48.5% | 简单 | n-1 | |
232 | Implement Queue using Stacks | 64.9% | 简单 | 应用 | |
235 | Lowest Common Ancestor of a Binary Search Tree | 64.8% | 简单 | BST | |
236 | Lowest Common Ancestor of a Binary Tree | 65% | 适中 | Postorder | |
238 | Product of Array Except Self | 70.7% | 适中 | 子数组 | |
240 | Search a 2D Matrix II | 41.8% | 适中 | 二维数组 | |
241 | Different Ways to Add Parentheses | 72% | 适中 | Parentheses | |
249 | Group Shifted Strings | 62% | 适中 | HashMap | |
251 | Flatten 2D Vector | 53.2% | 适中 | 实现题 | |
254 | Factor Combinations | 56.9% | 适中 | 组合 | |
256 | Paint House | 57.2% | 适中 | 实现题 | |
257 | Binary Tree Paths | 64.8% | 简单 | Preorder | |
261 | Graph Valid Tree | 47.7% | 适中 | 并查集 | |
263 | Ugly Number | 49.4% | 简单 | 实现题 | |
264 | Ugly Number II | 53.6% | 适中 | 实现题 | |
265 | Paint House II | 53.8% | 困难 | 实现题 | |
268 | Missing Number | 56.7% | 简单 | 异或 | |
269 | Alien Dictionary | 33.5% | 困难 | 拓扑排序 | |
270 | Closest Binary Search Tree Value | 52% | 简单 | BST | |
271 | Encode and Decode Strings | 54% | 适中 | 实现题 | |
273 | Integer to English Words | 28.4% | 困难 | 实现题 | |
276 | Paint Fence | 45.6% | 适中 | 实现题 | |
278 | First Bad Version | 40.3% | 简单 | 基础 | |
279 | Perfect Squares | 57.4% | 适中 | 实现题 | |
280 | Wiggle Sort | 68.3% | 适中 | 交换 | |
282 | Expression Add Operators | 34% | 困难 | 实现题 | |
283 | Move Zeroes | 62% | 简单 | 冒泡排序 | |
284 | Peeking Iterator | 71.2% | 适中 | Iterator | |
285 | Inorder Successor in BST | 62.2% | 适中 | BST&Inorder | |
286 | Walls and Gates | 47.2% | 适中 | Flood Fill | |
288 | Unique Word Abbreviation | 33.1% | 适中 | HashMap | |
291 | Word Pattern II | 52.6% | 适中 | 不重要 | |
296 | Best Meeting Point | 59.7% | 困难 | 实现题 | |
297 | Serialize and Deserialize Binary Tree | 51.7% | 困难 | BST&Inorder | |
298 | Binary Tree Longest Consecutive Sequence | 56.1% | 适中 | Preorder | |
300 | Longest Increasing Subsequence | 45.1% | 适中 | 字符串问题 | |
301 | Remove Invalid Parentheses | 47.8% | 困难 | Parentheses&极难 | |
302 | Smallest Rectangle Enclosing Black Pixels | 69.4% | 困难 | 二维数组 | |
305 | Number of Islands II | 33.5% | 困难 | 并查集 | |
307 | Range Sum Query - Mutable | 56.4% | 适中 | 树状数组,线断树 | |
308 | Range Sum Query 2D - Mutable | 59.1% | 困难 | 树状数组,线断树 | |
311 | Sparse Matrix Multiplication | 74.7% | 适中 | 不重要 | |
312 | Burst Balloons | 66.9% | 困难 | 超难 | |
314 | Binary Tree Vertical Order Traversal | 54.7% | 适中 | 难且重要 | |
316 | Remove Duplicate Letters | 40.4% | 适中 | HashMap | |
317 | Shortest Distance from All Buildings | 47.5% | 困难 | Flood Fill | |
318 | Maximum Product of Word Lengths | 64.4% | 适中 | BitMap | |
322 | Coin Change | 40.9% | 适中 | 背包变形 | |
323 | Number of Connected Components in an Undirected Graph | 59% | 适中 | 并查集 | |
324 | Wiggle Sort II | 35.9% | 适中 | 不重要 | |
325 | Maximum Size Subarray Sum Equals k | 49.9% | 适中 | 子数组 | |
329 | Longest Increasing Path in a Matrix | 46.2% | 困难 | Flood Fill | |
336 | Palindrome Pairs | 39.6% | 困难 | Palindrome | |
337 | House Robber III | 60% | 适中 | Postorder | |
338 | Counting Bits | 75.6% | 简单 | 不重要 | |
339 | Nested List Weight Sum | 79.1% | 适中 | DFS,BFS | |
340 | Longest Substring with At Most K Distinct Characters | 48.2% | 适中 | Substring&Sliding Window | |
341 | Flatten Nested List Iterator | 64.2% | 适中 | Stack | |
346 | Moving Average from Data Stream | 68.3% | 简单 | Queue | |
348 | Design Tic-Tac-Toe | 58.1% | 适中 | 实现题 | |
350 | Intersection of Two Arrays II | 52.5% | 简单 | HashMap | |
351 | Android Unlock Patterns | 57% | 适中 | 不重要 | |
353 | Design Snake Game | 41% | 适中 | 边界 | |
354 | Russian Doll Envelopes | 36.5% | 困难 | 递增 | |
359 | Logger Rate Limiter | 70.7% | 简单 | HashMap | |
361 | Bomb Enemy | 54.1% | 适中 | 伪DP | |
362 | Design Hit Counter | 68% | 适中 | Queue | |
364 | Nested List Weight Sum II | 70% | 适中 | DFS | |
367 | Valid Perfect Square | 43.4% | 简单 | 开方 | |
374 | Guess Number Higher or Lower | 45.3% | 简单 | 基础 | |
375 | Guess Number Higher or Lower II | 39.7% | 适中 | 超难 | |
376 | Wiggle Subsequence | 42.2% | 适中 | 实现题 | |
377 | Combination Sum IV | 42.8% | 适中 | 背包变形 | |
378 | Kth Smallest Element in a Sorted Matrix | 62.6% | 适中 | 基础 | |
379 | Design Phone Directory | 66.3% | 适中 | Queue | |
380 | Insert Delete GetRandom O(1) | 48.8% | 适中 | A&H | |
381 | Insert Delete GetRandom O(1) - Duplicates allowed | 38% | 困难 | A&H | |
384 | Shuffle an Array | 53.2% | 适中 | 基础 | |
385 | Mini Parser | 39.6% | 适中 | 压栈匹配 | |
389 | Find the Difference | 62.6% | 简单 | 异或 | |
394 | Decode String | 53% | 适中 | 压栈匹配 | |
398 | Random Pick Index | 62.3% | 适中 | 基础 |
九章算法
九章算法班 2023版 - 九章算法 - 帮助更多程序员找到好工作,硅谷顶尖IT企业工程师实时在线授课为你传授面试技巧
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算法第四版
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