| 0 |
2 Sum II - Input array is sorted.java |
Medium |
Java |
|
| 1 |
2 Sum II.java |
Medium |
Java |
|
| 2 |
2 Sum.java |
Medium |
Java |
Link |
| 3 |
3 Sum Closest.java |
Medium |
Java |
|
| 4 |
3 Sum Smaller.java |
|
Java |
|
| 5 |
3 Sum.java |
Medium |
Java |
|
| 6 |
4 Sum.java |
Medium |
Java |
|
| 7 |
A+B.java |
Easy |
Java |
|
| 8 |
Add and Search Word.java |
Medium |
Java |
|
| 9 |
Add Binary.java |
Easy |
Java |
|
| 10 |
Add Two Numbers II.java |
Medium |
Java |
|
| 11 |
Add Two Numbers.java |
Easy |
Java |
|
| 12 |
Alien Dictionary.java |
Hard |
Java |
|
| 13 |
Anagrams.java |
Medium |
Java |
|
| 14 |
Backpack II.java |
Medium |
Java |
|
| 15 |
Backpack.java |
Medium |
Java |
|
| 16 |
Balanced Binary Tree.java |
Medium |
Java |
|
| 17 |
Best Time to Buy and Sell Stock I.java |
Medium |
Java |
|
| 18 |
Best Time to Buy and Sell Stock II.java |
Medium |
Java |
|
| 19 |
Best Time to Buy and Sell Stock III .java |
Medium |
Java |
|
| 20 |
Best Time to Buy and Sell Stock IV.java |
Hard |
Java |
|
| 21 |
Binary Representation.java |
Hard |
Java |
|
| 22 |
Binary Search Tree Iterator.java |
Hard |
Java |
|
| 23 |
Binary Tree Inorder Traversal.java |
Easy |
Java |
|
| 24 |
Binary Tree Level Order Traversal II.java |
Medium |
Java |
|
| 25 |
Binary Tree Level Order Traversal.java |
Medium |
Java |
|
| 26 |
Binary Tree Longest Consecutive Sequence.java |
Medium |
Java |
|
| 27 |
Binary Tree Maximum Path Sum II.java |
Medium |
Java |
|
| 28 |
Binary Tree Maximum Path Sum.java |
Medium |
Java |
|
| 29 |
Binary Tree Path Sum.java |
Easy |
Java |
|
| 30 |
Binary Tree Paths.java |
Easy |
Java |
|
| 31 |
Binary Tree Postorder Traversal.java |
Easy |
Java |
|
| 32 |
Binary Tree Preorder Traversal.java |
Easy |
Java |
|
| 33 |
Binary Tree Right Side View.java |
Medium |
Java |
|
| 34 |
Binary Tree Serialization.java |
Medium |
Java |
|
| 35 |
Binary Tree Zigzag Level Order Traversal.java |
Medium |
Java |
|
| 36 |
Building Outline.java |
Hard |
Java |
|
| 37 |
Burst Balloons.java |
|
Java |
|
| 38 |
Change to Anagram.java |
Easy |
Java |
|
| 39 |
Classical Binary Search.java |
Easy |
Java |
|
| 40 |
Climbing Stairs.java |
Easy |
Java |
|
| 41 |
Clone Graph.java |
Medium |
Java |
|
| 42 |
Closest Binary Search Tree Value.java |
Easy |
Java |
|
| 43 |
Closest Number in Sorted Array.java |
Easy |
Java |
|
| 44 |
Coins in a Line.java |
|
Java |
|
| 45 |
ColorGrid.java |
Medium |
Java |
|
| 46 |
Combination Sum II.java |
Medium |
Java |
|
| 47 |
Combination Sum.java |
Medium |
Java |
|
| 48 |
Combinations.java |
Medium |
Java |
|
| 49 |
Compare Strings.java |
Easy |
Java |
|
| 50 |
Complete Binary Tree.java |
Easy |
Java |
|
| 51 |
Construct Binary Tree from Inorder and Postorder Traversal.java |
Medium |
Java |
|
| 52 |
Construct Binary Tree from Inorder and Preorder Traversal.java |
Medium |
Java |
|
| 53 |
Container With Most Water.java |
|
Java |
|
| 54 |
Convert Binary Search Tree to Doubly Linked List.java |
Medium |
Java |
|
| 55 |
Convert Expression to Polish Notation.java |
Hard |
Java |
|
| 56 |
Convert Expression to Reverse Polish Notation.java |
Hard |
Java |
|
| 57 |
Convert Integer A to Integer B.java |
Easy |
Java |
|
| 58 |
Convert Sorted Array to Binary Search Tree With Minimal Height.java |
Easy |
Java |
|
| 59 |
Convert Sorted List to Binary Search Tree.java |
Medium |
Java |
|
| 60 |
Copy List with Random Pointer.java |
Medium |
Java |
|
| 61 |
Cosine Similarity.java |
Easy |
Java |
|
| 62 |
Count 1 in Binary.java |
Easy |
Java |
|
| 63 |
Count and Say.java |
Easy |
Java |
|
| 64 |
Count of Smaller Number before itself.java |
Hard |
Java |
|
| 65 |
Count of Smaller Number.java |
Medium |
Java |
|
| 66 |
Count Primes.java |
Easy |
Java |
|
| 67 |
Course Schedule II.java |
Medium |
Java |
|
| 68 |
Course Schedule.java |
Medium |
Java |
|
| 69 |
Data Stream Median.java |
Hard |
Java |
|
| 70 |
Delete Digits.java |
Medium |
Java |
|
| 71 |
Delete Node in the Middle of Singly Linked List.java |
Easy |
Java |
|
| 72 |
Distinct Subsequences.java |
Hard |
Java |
|
| 73 |
Edit Distance.java |
Medium |
Java |
|
| 74 |
Encode and Decode Strings.java |
Medium |
Java |
|
| 75 |
ExcelSheetColumnNumber .java |
Easy |
Java |
|
| 76 |
Expression Evaluation.java |
Hard |
Java |
|
| 77 |
Expression Tree Build.java |
Hard |
Java |
|
| 78 |
Fast Power.java |
Medium |
Java |
|
| 79 |
Fibonacci.java |
Easy |
Java |
|
| 80 |
Find Minimum in Rotated Sorted Array II.java |
|
Java |
|
| 81 |
Find Minimum in Rotated Sorted Array.java |
|
Java |
|
| 82 |
Find Peak Element II.java |
|
Java |
|
| 83 |
Find Peak Element.java |
|
Java |
|
| 84 |
Find the Connected Component in the Undirected Graph.java |
Medium |
Java |
|
| 85 |
Find the Weak Connected Component in the Directed Graph.java |
Medium |
Java |
|
| 86 |
First Bad Version.java |
Medium |
Java |
|
| 87 |
First Missing Positive.java |
|
Java |
|
| 88 |
Flatten 2D Vector.java |
|
Java |
|
| 89 |
Flatten Binary Tree to Linked List.java |
Easy |
Java |
|
| 90 |
Flattern 2D Vector.java |
|
Java |
|
| 91 |
Flip Game II.java |
|
Java |
|
| 92 |
Flip Game.java |
|
Java |
|
| 93 |
Fraction to Recurring Decimal.java |
|
Java |
|
| 94 |
Game of Life.java |
|
Java |
|
| 95 |
Gas Station.java |
|
Java |
|
| 96 |
Generate Parentheses.java |
|
Java |
|
| 97 |
Graph Valid Tree.java |
Medium |
Java |
|
| 98 |
Gray Code.java |
Medium |
Java |
|
| 99 |
Group Anagrams.java |
Medium |
Java |
|
| 100 |
Group Shifted Strings.java |
Easy |
Java |
|
| 101 |
H-Index II.java |
|
Java |
|
| 102 |
H-Index.java |
|
Java |
|
| 103 |
Happy Number.java |
Easy |
Java |
|
| 104 |
Hash Function.java |
Easy |
Java |
|
| 105 |
HashHeap.java |
Hard |
Java |
|
| 106 |
HashWithArray.java |
Easy |
Java |
|
| 107 |
HashWithCustomizedClass(LinkedList).java |
Medium |
Java |
|
| 108 |
Heapify.java |
Medium |
Java |
|
| 109 |
House Robber II.java |
Medium |
Java |
|
| 110 |
House Robber III.java |
Hard |
Java |
|
| 111 |
House Robber.java |
Easy |
Java |
|
| 112 |
Identical Binary Tree.java |
Easy |
Java |
|
| 113 |
Implement Queue by Two Stacks.java |
|
Java |
|
| 114 |
Implement Stack by Two Queues.java |
|
Java |
|
| 115 |
Implement Stack.java |
|
Java |
|
| 116 |
Implement strStr().java |
|
Java |
|
| 117 |
Implement Trie (Prefix Tree).java |
|
Java |
|
| 118 |
Implement Trie.java |
Medium |
Java |
|
| 119 |
IndexMatch.java |
Easy |
Java |
|
| 120 |
Inorder Successor in Binary Search Tree.java |
Medium |
Java |
|
| 121 |
Insert Interval.java |
Easy |
Java |
|
| 122 |
Insert Node in a Binary Search Tree .java |
Easy |
Java |
|
| 123 |
Insertion Sort List.java |
|
Java |
|
| 124 |
Integer to English Words.java |
|
Java |
|
| 125 |
Interleaving Positive and Negative Numbers.java |
|
Java |
|
| 126 |
Interleaving String.java |
|
Java |
|
| 127 |
Intersection of Two Linked Lists.java |
Easy |
Java |
|
| 128 |
Interval Minimum Number.java |
Medium |
Java |
|
| 129 |
Interval Sum II.java |
Hard |
Java |
|
| 130 |
Interval Sum.java |
Medium |
Java |
|
| 131 |
Invert Binary Tree.java |
Easy |
Java |
|
| 132 |
Isomorphic Strings.java |
Easy |
Java |
|
| 133 |
Jump Game II.java |
Hard |
Java |
|
| 134 |
Jump Game.java |
Medium |
Java |
|
| 135 |
Kth Largest Element.java |
Medium |
Java |
|
| 136 |
Kth Smallest Element in a BST.java |
|
Java |
|
| 137 |
Kth Smallest Number in Sorted Matrix.java |
Medium |
Java |
|
| 138 |
Kth Smallest Sum In Two Sorted Arrays.java |
Hard |
Java |
|
| 139 |
Largest Number.java |
|
Java |
|
| 140 |
Largest Rectangle in Histogram.java |
|
Java |
|
| 141 |
Last Position of Target.java |
|
Java |
|
| 142 |
Length of Last Word.java |
|
Java |
|
| 143 |
Letter Combinations of a Phone Number.java |
Medium |
Java |
|
| 144 |
Linked List Cycle II.java |
|
Java |
|
| 145 |
Linked List Cycle.java |
|
Java |
|
| 146 |
Longest Common Prefix.java |
Medium |
Java |
|
| 147 |
Longest Common Subsequence.java |
|
Java |
|
| 148 |
Longest Common Substring.java |
|
Java |
|
| 149 |
Longest Consecutive Sequence.java |
|
Java |
|
| 150 |
Longest Increasing Continuous subsequence II.java |
|
Java |
|
| 151 |
Longest Increasing Continuous subsequence.java |
|
Java |
|
| 152 |
Longest Increasing Subsequence.java |
|
Java |
|
| 153 |
Longest Palindromic Substring.java |
Medium |
Java |
|
| 154 |
Longest Substring with At Most K Distinct Characters.java |
Medium |
Java |
|
| 155 |
Longest Substring Without Repeating Characters.java |
Medium |
Java |
|
| 156 |
Longest Words.java |
|
Java |
|
| 157 |
Lowest Common Ancestor II.java |
Easy |
Java |
|
| 158 |
Lowest Common Ancestor of a Binary Search Tree.java |
Medium |
Java |
|
| 159 |
Lowest Common Ancestor.java |
Easy |
Java |
|
| 160 |
LRU Cache.java |
Hard |
Java |
|
| 161 |
Majority Number II.java |
Medium |
Java |
|
| 162 |
Majority Number III.java |
Medium |
Java |
|
| 163 |
Majority Number.java |
Easy |
Java |
|
| 164 |
Matrix Zigzag Traversal.java |
Easy |
Java |
|
| 165 |
Max Tree.java |
Hard |
Java |
|
| 166 |
Maximal Square.java |
Medium |
Java |
|
| 167 |
Maximum Depth of Binary Tree.java |
Easy |
Java |
|
| 168 |
Maximum Product Subarray.java |
|
Java |
|
| 169 |
Maximum Subarray III.java |
|
Java |
|
| 170 |
MaximumSubarray.java |
|
Java |
|
| 171 |
MaximumSubarrayII.java |
|
Java |
|
| 172 |
Median of two Sorted Arrays.java |
Hard |
Java |
|
| 173 |
Median.java |
|
Java |
|
| 174 |
Meeting Rooms II.java |
Medium |
Java |
|
| 175 |
Meeting Rooms.java |
Easy |
Java |
|
| 176 |
Merge Intervals.java |
Easy |
Java |
|
| 177 |
Merge k Sorted Arrays.java |
Medium |
Java |
|
| 178 |
Merge k Sorted Lists.java |
Medium |
Java |
|
| 179 |
Merge Sorted Array II.java |
|
Java |
|
| 180 |
Merge Sorted Array.java |
Easy |
Java |
|
| 181 |
Merge Two Sorted List.java |
Easy |
Java |
|
| 182 |
Merge Two Sorted Lists.java |
|
Java |
|
| 183 |
Middle of Linked List.java |
|
Java |
|
| 184 |
Min Stack.java |
Easy |
Java |
|
| 185 |
Minimum Height Trees.java |
|
Java |
|
| 186 |
Minimum Path Sum.java |
|
Java |
|
| 187 |
Minimum Size Subarray Sum.java |
Medium |
Java |
|
| 188 |
Minimum Subarray.java |
|
Java |
|
| 189 |
Minimum Window Substring.java |
Hard |
Java |
|
| 190 |
MinimumDepthOfBinaryTree.java |
Easy |
Java |
|
| 191 |
Missing Ranges.java |
|
Java |
|
| 192 |
Multiply Strings.java |
Medium |
Java |
|
| 193 |
Next Permutation.java |
Medium |
Java |
|
| 194 |
Nim Game.java |
|
Java |
|
| 195 |
NQueens.java |
|
Java |
|
| 196 |
NQueensII.java |
|
Java |
|
| 197 |
Nth to Last Node in List.java |
|
Java |
|
| 198 |
Number of Airplane in the sky.java |
Medium |
Java |
|
| 199 |
Number of Islands II.java |
Hard |
Java |
|
| 200 |
Number of Islands.java |
Medium |
Java |
|
| 201 |
Number Triangles.java |
|
Java |
|
| 202 |
O(1) Check Power of 2.java |
|
Java |
|
| 203 |
One Edit Distance.java |
Medium |
Java |
|
| 204 |
Paint Fence.java |
|
Java |
|
| 205 |
Palindrome Linked List.java |
|
Java |
|
| 206 |
Palindrome Partitioning II.java |
|
Java |
|
| 207 |
Palindrome Partitioning.java |
|
Java |
|
| 208 |
Palindrome Permutation II.java |
Medium |
Java |
|
| 209 |
Palindrome Permutation.java |
Easy |
Java |
|
| 210 |
Partition Array by Odd and Even.java |
|
Java |
|
| 211 |
Partition Array.java |
|
Java |
|
| 212 |
Partition List.java |
|
Java |
|
| 213 |
Pascal's Triangle II.java |
Easy |
Java |
|
| 214 |
Peeking Iterator.java |
|
Java |
|
| 215 |
Perfect Squares.java |
|
Java |
|
| 216 |
Permutation Index.java |
Easy |
Java |
|
| 217 |
Permutation Sequence.java |
Medium |
Java |
|
| 218 |
Permutations II.java |
Medium |
Java |
|
| 219 |
Permutations.java |
Medium |
Java |
|
| 220 |
Plus One.java |
|
Java |
|
| 221 |
Populating Next Right Pointers in Each Node II.java |
Hard |
Java |
|
| 222 |
Populating Next Right Pointers in Each Node.java |
Medium |
Java |
|
| 223 |
Pow(x,n).java |
|
Java |
|
| 224 |
Power of Three.java |
Easy |
Java |
|
| 225 |
Product of Array Exclude Itself.java |
|
Java |
|
| 226 |
QuickSort.java |
Easy |
Java |
|
| 227 |
Recover Rotated Sorted Array.java |
|
Java |
|
| 228 |
Rehashing.java |
Medium |
Java |
|
| 229 |
Remove Duplicates from Sorted Array.java |
|
Java |
|
| 230 |
Remove Duplicates from Sorted List II.java |
|
Java |
|
| 231 |
Remove Duplicates from Sorted List.java |
|
Java |
|
| 232 |
Remove Duplicates from Unsorted List.java |
|
Java |
|
| 233 |
Remove Linked List Elements.java |
|
Java |
|
| 234 |
Remove Node in Binary Search Tree.java |
Hard |
Java |
|
| 235 |
Remove Nth Node From End of List.java |
|
Java |
|
| 236 |
Reorder List.java |
|
Java |
|
| 237 |
Restore IP Addresses.java |
|
Java |
|
| 238 |
Reverse Integer.java |
|
Java |
|
| 239 |
Reverse Linked List II .java |
|
Java |
|
| 240 |
Reverse Linked List.java |
Easy |
Java |
|
| 241 |
Reverse Words in a String II.java |
Medium |
Java |
|
| 242 |
Reverse Words in a String.java |
Medium |
Java |
|
| 243 |
reverseInteger.java |
|
Java |
|
| 244 |
Roman to Integer.java |
Easy |
Java |
|
| 245 |
Rotate Image.java |
Medium |
Java |
|
| 246 |
Rotate List.java |
|
Java |
|
| 247 |
Rotate String.java |
|
Java |
|
| 248 |
Search a 2D Matrix II.java |
|
Java |
|
| 249 |
Search a 2D Matrix.java |
|
Java |
|
| 250 |
Search for a Range.java |
|
Java |
|
| 251 |
Search Insert Position.java |
|
Java |
|
| 252 |
Search Range in Binary Search Tree .java |
Medium |
Java |
|
| 253 |
Search Rotated in Sorted Array II.java |
|
Java |
|
| 254 |
Search Rotated in Sorted Array.java |
Hard |
Java |
|
| 255 |
Segment Tree Build II.java |
Medium |
Java |
|
| 256 |
Segment Tree Build.java |
Medium |
Java |
|
| 257 |
Segment Tree Modify.java |
Medium |
Java |
|
| 258 |
Segment Tree Query II.java |
Medium |
Java |
|
| 259 |
Segment Tree Query.java |
Medium |
Java |
|
| 260 |
Serilization and Deserialization Of Binary Tree.java |
|
Java |
|
| 261 |
Single Number II.java |
|
Java |
|
| 262 |
Single Number III.java |
|
Java |
|
| 263 |
Single Number.java |
|
Java |
|
| 264 |
Singleton.java |
|
Java |
|
| 265 |
Sliding Window Maximum.java |
|
Java |
|
| 266 |
Sliding Window Median.java |
|
Java |
|
| 267 |
Sort Color.java |
|
Java |
|
| 268 |
Sort Colors II.java |
|
Java |
|
| 269 |
Sort Letters by Case.java |
|
Java |
|
| 270 |
Sort List.java |
|
Java |
|
| 271 |
Space Replacement.java |
|
Java |
|
| 272 |
Sqrt(x).java |
|
Java |
|
| 273 |
Stone Game.java |
|
Java |
|
| 274 |
String to Integer(atoi).java |
Easy |
Java |
|
| 275 |
Strobogrammatic Number II.java |
|
Java |
|
| 276 |
Strobogrammatic Number.java |
|
Java |
|
| 277 |
StrStr.java |
|
Java |
|
| 278 |
Subarray Sum Closest.java |
Medium |
Java |
|
| 279 |
Subarray Sum.java |
Easy |
Java |
|
| 280 |
Subset.java |
Medium |
Java |
|
| 281 |
Subsets II.java |
Medium |
Java |
|
| 282 |
Subtree.java |
Easy |
Java |
|
| 283 |
Summary Ranges.java |
|
Java |
|
| 284 |
Surrounded Regions.java |
|
Java |
|
| 285 |
Swap Nodes in Pairs.java |
|
Java |
|
| 286 |
Symmetric Binary Tree.java |
Easy |
Java |
|
| 287 |
The Smallest Difference.java |
|
Java |
|
| 288 |
Top K Frequent Words.java |
Medium |
Java |
|
| 289 |
Topological Sorting.java |
Medium |
Java |
|
| 290 |
Total Occurrence of Target.java |
|
Java |
|
| 291 |
Trailing Zeros.java |
|
Java |
|
| 292 |
Trapping Rain Water II.java |
Hard |
Java |
|
| 293 |
Trapping Rain Water.java |
Medium |
Java |
|
| 294 |
Triangle Count.java |
|
Java |
|
| 295 |
Tweaked Identical Binary Tree.java |
Easy |
Java |
|
| 296 |
Two Lists Sum.java |
|
Java |
|
| 297 |
Two Strings Are Anagrams.java |
Easy |
Java |
|
| 298 |
Ugly Number II.java |
|
Java |
|
| 299 |
Ugly Number.java |
Medium |
Java |
|
| 300 |
Unique Binary Search Tree II.java |
|
Java |
|
| 301 |
Unique Binary Search Tree.java |
|
Java |
|
| 302 |
Unique Characters.java |
|
Java |
|
| 303 |
Unique Path.java |
Medium |
Java |
|
| 304 |
Unique Paths II.java |
|
Java |
|
| 305 |
Unique Word Abbreviation.java |
|
Java |
|
| 306 |
Update Bits.java |
|
Java |
|
| 307 |
Valid Anagram.java |
|
Java |
|
| 308 |
Valid Palindrome.java |
Easy |
Java |
Link |
| 309 |
Valid Parentheses.java |
Easy |
Java |
|
| 310 |
Valid Sudoku.java |
Easy |
Java |
|
| 311 |
Validate Binary Search Tree.java |
Medium |
Java |
|
| 312 |
Wiggle Sort.java |
|
Java |
|
| 313 |
Wood Cut.java |
|
Java |
|
| 314 |
Word Break II.java |
Hard |
Java |
|
| 315 |
Word Break.java |
Medium |
Java |
|
| 316 |
Word Ladder II.java |
Hard |
Java |
|
| 317 |
Word Ladder.java |
Medium |
Java |
|
| 318 |
Word Pattern.java |
Easy |
Java |
|
| 319 |
Word Search II.java |
Hard |
Java |
|
| 320 |
Word Search.java |
Medium |
Java |
|
| 321 |
Zigzag Iterator.java |
|
Java |
|