| 1946 | Largest Number After Mutating Substring | C++, Java | Medium |
| 1945 | Sum of Digits of String After Convert | C++ | Easy |
| 1935 | Maximum Number of Words You Can Type | C++ | Easy |
| 1884 | Egg Drop With 2 Eggs and N Floors | C++ | Medium |
| 1882 | Process Tasks Using Servers | C++ | Medium |
| 1881 | Maximum Value after Insertion | C++ | Medium |
| 1880 | Check if Word Equals Summation of Two Words | C++ | Easy |
| 1877 | Minimize Maximum Pair Sum in Array | C++ | Medium |
| 1876 | Substrings of Size Three with Distinct Characters | C++ | Easy |
| 1871 | Jump Game VII | C++ | Medium |
| 1870 | Minimum Speed to Arrive on Time | C++ | Medium |
| 1869 | Longer Contiguous Segments of Ones than Zeros | C++ | Easy |
| 1862 | Sum of Floored Pairs | C++ | Hard |
| 1861 | Rotating the Box | C++ | Medium |
| 1860 | Incremental Memory Leak | C++ | Medium |
| 1859 | Sorting the Sentence | C++ | Easy |
| 1857 | Largest Color Value in a Directed Graph | C++ | Hard |
| 1856 | Maximum Subarray Min-Product | C++ | Medium |
| 1855 | Maximum Distance Between a Pair of Values | C++ | Medium |
| 1854 | Maximum Population Year | C++ | Easy |
| 1851 | Minimum Interval to Include Each Query | C++ | Hard |
| 1850 | Minimum Adjacent Swaps to Reach the Kth Smallest Number | C++ | Medium |
| 1849 | Splitting a String Into Descending Consecutive Values | C++ | Medium |
| 1848 | Minimum Distance to the Target Element | C++ | Easy |
| 1847 | Closest Room | C++ | Hard |
| 1846 | Maximum Element After Decreasing and Rearranging | C++ | Medium |
| 1845 | Seat Reservation Manager | C++ | Medium |
| 1844 | Replace All Digits with Characters | C++ | Easy |
| 1840 | Maximum Building Height | C++ | Hard |
| 1839 | Longest Substring Of All Vowels in Order | C++ | Medium |
| 1838 | Frequency of the Most Frequent Element | C++ | Medium |
| 1837 | Sum of Digits in Base K | C++ | Easy |
| 1835 | Find XOR Sum of All Pairs Bitwise AND | C++ | Hard |
| 1834 | Single-Threaded CPU | C++ | Medium |
| 1833 | Maximum Ice Cream Bars | C++ | Medium |
| 1832 | Check if the Sentence Is Pangram | C++ | Easy |
| 1829 | Maximum XOR for Each Query | C++ | Medium |
| 1828 | Queries on Number of Points Inside a Circle | C++ | Medium |
| 1827 | Minimum Operations to Make the Array Increasing | C++ | Easy |
| 1825 | Finding MK Average | C++ | Hard |
| 1824 | Minimum Sideway Jumps | C++ | Medium |
| 1823 | Find the Winner of the Circular Game | C++ | Medium |
| 1822 | Sign of the Product of an Array | C++ | Easy |
| 1819 | Number of Different Subsequences GCDs | C++ | Hard |
| 1818 | Minimum Absolute Sum Difference | C++ | Medium |
| 1817 | Finding the Users Active Minutes | C++ | Medium |
| 1816 | Truncate Sentence | C++ | Easy |
| 1815 | Maximum Number of Groups Getting Fresh Donuts | C++ | Hard |
| 1814 | Count Nice Pairs in an Array | C++ | Medium |
| 1813 | Sentence Similarity III | C++ | Medium |
| 1812 | Determine Color of a Chessboard Square | C++ | Easy |
| 1808 | Maximize Number of Nice Divisors | C++ | Hard |
| 1807 | Evaluate the Bracket Pairs of a String | C++ | Medium |
| 1806 | Minimum Number of Operations to Reinitialize a Permutation | C++ | Medium |
| 1805 | Number of Different Integers in a String | C++ | Easy |
| 1803 | Count Pairs With XOR in a Range | C++ | Hard |
| 1802 | Maximum Value at a Given Index in a Bounded Array | C++ | Medium |
| 1801 | Number of Orders in the Backlog | C++ | Medium |
| 1800 | Maximum Ascending Subarray Sum | C++ | Easy |
| 1799 | Maximize Score After N Operations | C++ | Hard |
| 1798 | Maximum Number of Consecutive Values You Can Make | C++ | Medium |
| 1797 | Design Authentication Manager | C++ | Medium |
| 1796 | Second Largest Digit in a String | C++ | Easy |
| 1793 | Maximum Score of a Good Subarray | C++ | Hard |
| 1792 | Maximum Average Pass Ratio | C++ | Medium |
| 1791 | Find Center of Star Graph | C++ | Medium |
| 1790 | Check if One String Swap Can Make Strings Equal | C++ | Easy |
| 1787 | Make the XOR of All Segments Equal to Zero | C++ | Hard |
| 1786 | Number of Restricted Paths From First to Last Node | C++ | Medium |
| 1785 | Minimum Elements to Add to Form a Given Sum | C++ | Medium |
| 1784 | Check if Binary String Has at Most One Segment of Ones | C++ | Easy |
| 1782 | Count Pairs Of Nodes | C++ | Hard |
| 1781 | Sum of Beauty of All Substrings | C++ | Medium |
| 1780 | Check if Number is a Sum of Powers of Three | C++ | Medium |
| 1779 | Find Nearest Point That Has the Same X or Y Coordinate | C++ | Easy |
| 1775 | Equal Sum Arrays With Minimum Number of Operations | C++ | Medium |
| 1774 | Closest Dessert Cost | C++ | Medium |
| 1773 | Count Items Matching a Rule | C++ | Easy |
| 1771 | Maximize Palindrome Length From Subsequences | C++ | Hard |
| 1770 | Maximum Score from Performing Multiplication Operations | C++ | Medium |
| 1769 | Minimum Number of Operations to Move All Balls to Each Box | C++ | Medium |
| 1768 | Merge Strings Alternately | C++ | Easy |
| 1766 | Tree of Coprimes | C++ | Hard |
| 1765 | Map of Highest Peak | C++ | Medium |
| 1764 | Form Array by Concatenating Subarrays of Another Array | C++ | Medium |
| 1763 | Longest Nice Substring | C++ | Easy |
| 1761 | Minimum Degree of a Connected Trio in a Graph | C++ | Hard |
| 1760 | Minimum Limit of Balls in a Bag | C++ | Medium |
| 1759 | Count Number of Homogenous Substrings | C++ | Medium |
| 1758 | Minimum Changes To Make Alternating Binary String | C++ | Easy |
| 1755 | Closest Subsequence Sum | C++ | Hard |
| 1754 | Largest Merge Of Two Strings | C++ | Medium |
| 1753 | Maximum Score From Removing Stones | C++ | Medium |
| 1752 | Check if Array Is Sorted and Rotated | C++ | Easy |
| 1751 | Maximum Number of Events That Can Be Attended II | C++ | Hard |
| 1750 | Minimum Length of String After Deleting Similar Ends | C++ | Medium |
| 1749 | Maximum Absolute Sum of Any Subarray | C++ | Medium |
| 1748 | Sum of Unique Elements | C++ | Easy |
| 1743 | Restore the Array From Adjacent Pairs | C++ | Medium |
| 1742 | Maximum Number of Balls in a Box | C++ | Easy |
| 1739 | Building Boxes | C++ | Hard |
| 1738 | Find Kth Largest XOR Coordinate Value | C++ | Medium |
| 1736 | Latest Time by Replacing Hidden Digits | C++ | Easy |
| 1734 | Decode XORed Permutation | C++ | Medium |
| 1733 | Minimum Number of People to Teach | C++ | Medium |
| 1732 | Find the Highest Altitude | C++ | Easy |
| 1727 | Largest Submatrix With Rearrangements | C++ | Medium |
| 1726 | Tuple with Same Product | C++ | Medium |
| 1725 | Number Of Rectangles That Can Form The Largest Square | C++ | Easy |
| 1718 | Construct the Lexicographically Largest Valid Sequence | C++ | Medium |
| 1717 | Maximum Score From Removing Substrings | C++ | Medium |
| 1716 | Calculate Money in Leetcode Bank | C++ | Easy |
| 1712 | Ways to Split Array Into Three Subarrays | C++ | Medium |
| 1711 | Count Good Meals | C++ | Medium |
| 1710 | Maximum Units on a Truck | C++ | Easy |
| 1700 | Number of Students Unable to Eat Lunch | C++ | Easy |
| 1695 | Maximum Erasure Value | C++ | Medium |
| 1694 | Reformat Phone Number | C++ | Easy |
| 1625 | Lexicographically Smallest String After Applying Operations | C++ | Medium |
| 1624 | Largest Substring Between Two Equal Characters | C++ | Easy |
| 1605 | Find Valid Matrix Given Row and Column Sums | C++ | Medium |
| 1573 | Number of Ways to Split a String | C++ | Medium |
| 1556 | Thousand Separator | C++ | Easy |
| 1551 | Minimum Operations to Make Array Equal | C++ | Medium |
| 1550 | Three Consecutive Odds | C++ | Easy |
| 1541 | Minimum Insertions to Balance a Parentheses String | C++ | Medium |
| 1535 | Find the Winner of an Array Game | C++ | Medium |
| 1529 | Bulb Switcher IV | C++ | Medium |
| 1528 | Shuffle String | C++ | Easy |
| 1525 | Number of Good Ways to Split a String | C++ | Medium |
| 1524 | Number of Sub-arrays With Odd Sum | C++ | Medium |
| 1523 | Count Odd Numbers in an Interval Range | C++ | Easy |
| 1513 | Number of Substrings With Only 1s | C++ | Medium |
| 1470 | Shuffle the Array | C++ | Easy |
| 1464 | Maximum Product of Two Elements in an Array | C++ | Easy |
| 1460 | Make Two Arrays Equal by Reversing Sub-arrays | C++ | Easy |
| 1376 | Time Needed to Inform All Employees | C++ | Medium |
| 1375 | Bulb Switcher III | C++ | Medium |
| 1353 | Maximum Number of Events That Can Be Attended | C++ | Medium |
| 1333 | Filter Restaurants by Vegan-Friendly, Price and Distance | C++ | Medium |
| 1207 | Unique Number of Occurrences | C++ | Easy |
| 1170 | Compare Strings by Frequency of the Smallest Character | C++ | Easy |
| 1071 | Greatest Common Divisor of Strings | C++ | Easy |
| 1030 | Matrix Cells in Distance Order | C++ | Easy |
| 1029 | Two City Scheduling | C++ | Easy |
| 1028 | Recover a Tree From Preorder Traversal | C++ | Hard |
| 1024 | Video Stitching | C++ | Medium |
| 993 | Cousins in Binary Tree | C++ | Easy |
| 991 | Broken Calculator | C++ | Medium |
| 990 | Satisfiability of Equality Equations | C++ | Medium |
| 989 | Add to Array-Form of Integer | C++ | Easy |
| 988 | Smallest String Starting From Leaf | C++ | Medium |
| 987 | Vertical Order Traversal of a Binary Tree | C++ | Medium |
| 986 | Interval List Intersections | C++ | Medium |
| 985 | Sum of Even Numbers After Queries | C++ | Easy |
| 984 | String Without AAA or BBB | C++ | Easy |
| 983 | Minimum Cost For Tickets | C++ | Medium |
| 982 | Triples with Bitwise AND Equal To Zero | C++ | Hard |
| 981 | Time Based Key-Value Store | C++ | Medium |
| 980 | Unique Paths III | C++,Python | Hard |
| 979 | Distribute Coins in Binary Tree | C++ | Medium |
| 978 | Longest Turbulent Subarray | C++,Python | Medium |
| 977 | Squares of a Sorted Array | C++, Python | Easy |
| 976 | Largest Perimeter Triangle | C++, Python | Easy |
| 971 | Flip Binary Tree To Match Preorder Traversal | Python | Medium |
| 969 | Pancake Sorting | Python | Medium |
| 961 | N-Repeated element in size 2N Array | C++ | Easy |
| 958 | Check Completeness of a Binary Tree | Python | Medium |
| 951 | Flip Equivalent Binary Trees | Python | Medium |
| 950 | Reveal Cards In Increasing Order | Python | Medium |
| 941 | Valid Mountain Array | Python | Easy |
| 933 | Number of Recent Calls | C++ | Easy |
| 931 | Minimum Falling Path Sum | C++ | Medium |
| 929 | Unique Email Addresses | C++ | Easy |
| 922 | Sort Array By Parity II | C++ | Easy |
| 914 | X of a Kind in a Deck of Cards | Python | Easy |
| 905 | Sort Array By Parity | C++ | Easy |
| 876 | Middle of the Linked List | Python | Easy |
| 859 | Buddy Strings | C++ | Easy |
| 858 | Mirror Reflection | C++ | Medium |
| 852 | Peak Index in a Mountain Array | C++ | Easy |
| 849 | Maximize Distance to Closest Person | Python | Easy |
| 844 | Backspace String Compare | C++ | Easy |
| 837 | Most Common Word | C++ | Easy |
| 830 | Positions of Large Groups | Python | Easy |
| 820 | Short Encoding of Words | C++ | Medium |
| 804 | Unique Morse Code Words | C++ | Easy |
| 776 | Swim In Rising Water | Python | Hard |
| 771 | Jewels and Stones | C++ | Easy |
| 747 | Largest Number At Least Twice of Others | Python | Easy |
| 746 | Min Cost Climbing Stairs | C++, Python | Easy |
| 721 | Accounts Merge | C++ | Medium |
| 717 | 1-bit and 2-bit Characters | Python | Easy |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | C++ | Medium |
| 712 | Minimum ASCII Delete Sum for Two Strings | C++ | Medium |
| 695 | Max Area of Island | C++ | Medium |
| 687 | Longest Univalue Path | Python | Easy |
| 684 | Redundant Connection | Python | Medium |
| 674 | Longest Continuous Increasing Subsequence | Python | Easy |
| 672 | Bulb Switcher II | C++ | Medium |
| 671 | Second Minimum Node In a Binary Tree | Python | Easy |
| 665 | Non-decreasing Array | Python | Easy |
| 662 | Maximum Width of Binary Tree | Python | Medium |
| 661 | Image Smoother | Python | Easy |
| 655 | Print Binary Tree | Python | Medium |
| 652 | Find Duplicate Subtrees | Python | Medium |
| 647 | Palindromic Substrings | C++ | Medium |
| 643 | Maximum Average Subarray I | C++, Python | Easy |
| 628 | Maximum Product of Three Numbers | Python | Easy |
| 623 | Add One Row to Tree | Python | Medium |
| 581 | Shortest Unsorted Continuous Subarray | Python | Easy |
| 572 | Subtree of Another Tree | Python | Easy |
| 563 | Binary Tree Tilt | Python | Easy |
| 547 | Friend Circles | C++ | Medium |
| 543 | Diameter of Binary Tree | C++, Python | Easy |
| 538 | Convert BST to Greater Tree | Python | Easy |
| 532 | K-diff Pairs in an Array | Python | Easy |
| 520 | Detect Capital | C++ | Easy |
| 518 | Coin Change 2 | C++ | Medium |
| 516 | Longest Palindromic Subsequence | C++ | Medium |
| 509 | Fibonacci Number | C++, Python | Easy |
| 497 | Random Point in Non-overlapping Rectangles | C++ | Medium |
| 494 | Target Sum | C++ | Medium |
| 477 | Total Hamming Distance | C++ | Medium |
| 463 | Island Perimeter | C++ | Easy |
| 450 | DeleteNodeInABST | Python | Medium |
| 449 | Serialize and Deserialize BST | Python | Medium |
| 438 | Find all Anagrams in a string | C++ | Medium |
| 437 | Path Sum III | Python | Medium |
| 418 | SentenceScreenFitting 🔒 | C++ | Easy |
| 416 | Partition Equal Subset Sum | C++ | Medium |
| 415 | Add Strings | C++ | Easy |
| 414 | Third Maximum Number | C++, Python | Easy |
| 413 | Arithmetic Slices | C++ | Medium |
| 412 | Fizz Buzz | C++ | Easy |
| 410 | Split Array Largest Sum | C++ | Hard |
| 409 | Longest Palindrome | C++ | Easy |
| 406 | Queue Reconstruction by Height | C++ | Medium |
| 405 | Convert a Number to Hexadecimal | C++ | Easy |
| 404 | Sum of Left Leaves | C++, Python | Easy |
| 403 | Frog Jump | C++ | Hard |
| 402 | Remove K Digits | C++ | Medium |
| 401 | Binary Watch | C++ | Easy |
| 400 | Nth Digit | C++ | Medium |
| 399 | Evaluate Division | C++ | Medium |
| 398 | Random Pick Index | C++ | Medium |
| 397 | Integer Replacement | C++ | Medium |
| 396 | Rotate Function | C++ | Easy |
| 395 | Longest Substring with At Least K Repeating Characters | C++ | Medium |
| 394 | Decode String | C++ | Medium |
| 393 | UTF-8 Validation | C++ | Medium |
| 392 | Is Subsequence | C++ | Medium |
| 391 | Perfect Rectangle | C++ | Hard |
| 390 | Elimination Game | C++ | Medium |
| 389 | Find the Difference | C++ | Easy |
| 388 | Longest Absolute File Path | C++ | Medium |
| 387 | First Unique Character in a String | C++ | Easy |
| 386 | Lexicographical Numbers | C++ | Medium |
| 385 | Mini Parser | C++ | Medium |
| 384 | Shuffle an Array | C++ | Medium |
| 383 | Ransom Note | C++ | Easy |
| 382 | Linked List Random Node | C++ | Medium |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | C++ | Hard |
| 380 | Insert Delete GetRandom O(1) | C++ | Hard |
| 377 | Combination Sum IV | C++ | Medium |
| 376 | Wiggle Subsequence | C++ | Medium |
| 371 | Sum of Two Integers | C++ | Easy |
| 367 | Valid Perfect Square | C++ | Easy |
| 357 | Count Numbers with Unique Digits | C++ | Medium |
| 350 | Intersection of Two Arrays II | C++ | Easy |
| 349 | Intersection of Two Arrays | C++ | Easy |
| 347 | Top K Frequent Elements | C++ | Medium |
| 345 | Reverse Vowels of a String | C++ | Easy |
| 344 | Reverse String | C++ | Easy |
| 343 | Integer Break | C++ | Medium |
| 342 | Power of Four | C++ | Easy |
| 341 | Flatten Nested List Iterator | C++ | Medium |
| 338 | Counting Bits | C++ | Medium |
| 337 | House Robber III | C++, Python | Medium |
| 336 | Palindrome Pairs | C++ | Hard |
| 334 | Increasing Triplet Subsequence | C++ | Medium |
| 332 | Reconstruct Itinerary | C++ | Medium |
| 331 | Verify Preorder Serialization of a Binary Tree | C++ | Medium |
| 330 | Patching Array | C++ | Medium |
| 329 | Longest Increasing Path in a Matrix | C++ | Medium |
| 328 | Odd Even Linked List | C++ | Easy |
| 327 | Count of Range Sum | C++ | Hard |
| 326 | Power of Three | C++ | Easy |
| 324 | Wiggle Sort II | C++ | Medium |
| 322 | Coin Change | C++ | Medium |
| 321 | Create Maximum Number | C++ | Hard |
| 319 | Bulb Switcher | C++ | Medium |
| 318 | Maximum Product of Word Lengths | C++ | Medium |
| 316 | Remove Duplicate Letters | C++ | Hard |
| 315 | Count of Smaller Numbers After Self | C++ | Hard |
| 313 | Super Ugly Number | C++ | Medium |
| 312 | Burst Balloons | C++ | Hard |
| 310 | Minimum Height Trees | C++ | Medium |
| 309 | Best Time to Buy and Sell Stock with Cooldown | C++ | Medium |
| 307 | Range Sum Query - Mutable | C++ | Medium |
| 306 | Additive Number | C++ | Medium |
| 304 | Range Sum Query 2D - Immutable | C++ | Medium |
| 303 | Range Sum Query - Immutable | C++ | Easy |
| 301 | Remove Invalid Parentheses | C++ | Hard |
| 300 | Longest Increasing Subsequence | C++ | Medium |
| 299 | Bulls and Cows | C++ | Easy |
| 297 | Serialize and Deserialize Binary Tree | C++ | Medium |
| 295 | Find Median from Data Stream | C++ | Hard |
| 292 | Nim Game | C++ | Easy |
| 290 | Word Pattern | C++ | Easy |
| 289 | Game of Life | C++ | Medium |
| 287 | Find the Duplicate Number | C++, Python | Hard |
| 285 | Inorder Successor in BST 🔒 | Java | Medium |
| 284 | Peeking Iterator | C++ | Medium |
| 283 | Move Zeroes | C++ | Easy |
| 282 | Expression Add Operators | C++ | Hard |
| 279 | Perfect Squares | C++ | Medium |
| 278 | First Bad Version | C++, Java | Easy |
| 275 | H-Index II | C++ | Medium |
| 274 | H-Index | C++ | Medium |
| 273 | Integer to English Words | C++ | Medium |
| 268 | Missing Number | C++ | Medium |
| 264 | Ugly Number II | C++ | Medium |
| 263 | Ugly Number | C++ | Easy |
| 260 | Single Number III | C++ | Medium |
| 258 | Add Digits | C++ | Easy |
| 257 | Binary Tree Paths | C++ | Easy |
| 242 | Valid Anagram | C++, Java | Easy |
| 241 | Different Ways to Add Parentheses | C++, Python | Medium |
| 240 | Search a 2D Matrix II | C++, Java, Python | Medium |
| 239 | Sliding Window Maximum | C++ | Hard |
| 238 | Product of Array Except Self | C++ | Medium |
| 237 | Delete Node in a Linked List | C++ | Easy |
| 236 | Lowest Common Ancestor of a Binary Tree | C++, Java, Python | Medium |
| 235 | Lowest Common Ancestor of a Binary Search Tree | C++, Python | Easy |
| 234 | Palindrome Linked List | C++ | Easy |
| 233 | Number of Digit One | C++ | Medium |
| 232 | Implement Queue using Stacks | C++, Java | Easy |
| 231 | Power of Two | C++ | Easy |
| 230 | Kth Smallest Element in a BST | C++, Python | Medium |
| 229 | Majority Element II | C++ | Medium |
| 228 | Summary Ranges | C++ | Easy |
| 227 | Basic Calculator II | C++ | Medium |
| 226 | Invert Binary Tree | C++ | Easy |
| 225 | Implement Stack using Queues | C++, Java | Medium |
| 224 | Basic Calculator | C++ | Medium |
| 223 | Rectangle Area | C++ | Easy |
| 222 | Count Complete Tree Nodes | C++, Python | Medium |
| 221 | Maximal Square | C++ | Medium |
| 220 | Contains Duplicate III | C++, Python | Medium |
| 219 | Contains Duplicate II | C++, Python | Easy |
| 218 | The Skyline Problem | C++ | Hard |
| 217 | Contains Duplicate | C++ | Easy |
| 216 | Combination Sum III | C++ | Medium |
| 215 | Kth Largest Element in an Array | C++ | Medium |
| 214 | Shortest Palindrome | C++ | Hard |
| 213 | House Robber II | C++ | Medium |
| 212 | Word Search II | C++ | Hard |
| 211 | Add and Search Word - Data structure design | C++ | Medium |
| 210 | Course Schedule II | C++ | Medium |
| 209 | Minimum Size Subarray Sum | C++ | Medium |
| 208 | Implement Trie (Prefix Tree) | C++ | Medium |
| 207 | Course Schedule | C++ | Medium |
| 206 | Reverse Linked List | C++, Java | Easy |
| 205 | Isomorphic Strings | C++ | Easy |
| 204 | Count Primes | C++ | Easy |
| 203 | Remove Linked List Elements | C++ | Easy |
| 202 | Happy Number | C++, Python | Easy |
| 201 | Bitwise AND of Numbers Range | C++ | Medium |
| 200 | Number of Islands | C++, Python | Medium |
| 199 | Binary Tree Right Side View | C++ | Medium |
| 198 | House Robber | C++, Python | Easy |
| 191 | Number of 1 Bits | C++ | Easy |
| 190 | Reverse Bits | C++ | Easy |
| 189 | Rotate Array | C++, Java | Easy |
| 188 | Best Time to Buy and Sell Stock IV | C++ | Hard |
| 187 | Repeated DNA Sequences | C++ | Medium |
| 186 | Reverse Words in a String II 🔒 | C++ | Medium |
| 179 | Largest Number | C++ | Medium |
| 174 | Dungeon Game | C++ | Hard |
| 173 | Binary Search Tree Iterator | C++, Java, Python | Medium |
| 172 | Factorial Trailing Zeroes | C++ | Easy |
| 171 | Excel Sheet Column Number | C++ | Easy |
| 170 | Two Sum III - Data structure design 🔒 | C++ | Easy |
| 169 | Majority Element | C++ | Easy |
| 168 | Excel Sheet Column Title | C++ | Easy |
| 167 | Two Sum II - Input array is sorted 🔒 | C++ | Medium |
| 166 | Fraction to Recurring Decimal | C++ | Medium |
| 165 | Compare Version Numbers | C++ | Easy |
| 164 | Maximum Gap | C++ | Hard |
| 163 | Missing Ranges 🔒 | C++ | Medium |
| 162 | Find Peak Element | C++, Java | Medium |
| 161 | One Edit Distance🔒 | C++ | Medium |
| 160 | Intersection of Two Linked Lists | C++ | Easy |
| 159 | Longest Substring with At Most Two Distinct Characters 🔒 | C++ | Hard |
| 158 | Read N Characters Given Read4 II - Call multiple times 🔒 | C++ | Hard |
| 157 | Read N Characters Given Read4 🔒 | C++ | Easy |
| 156 | Binary Tree Upside Down 🔒 | C++ | Medium |
| 155 | Min Stack | C++, Java | Easy |
| 154 | Find Minimum in Rotated Sorted Array II | C++ | Hard |
| 153 | Find Minimum in Rotated Sorted Array | C++, Java | Medium |
| 152 | Maximum Product Subarray | C++ | Medium |
| 151 | Reverse Words in a String | C++, Java | Medium |
| 150 | Evaluate Reverse Polish Notation | C++ | Medium |
| 149 | Max Points on a Line | C++ | Hard |
| 148 | Sort List | C++, Python | Medium |
| 147 | Insertion Sort List | C++, Python | Medium |
| 146 | LRU Cache | C++, Java | Hard |
| 145 | Binary Tree Postorder Traversal | C++, Python | Hard |
| 144 | Binary Tree Preorder Traversal | C++, Java | Medium |
| 143 | Reorder List | C++, Python | Medium |
| 142 | Linked List Cycle II | C++, Python | Medium |
| 141 | Linked List Cycle | C++ | Medium |
| 140 | Word Break II | C++ | Hard |
| 139 | Word Break | C++ | Medium |
| 138 | Copy List with Random Pointer | C++, Python | Hard |
| 137 | Single Number II | C++, Python | Medium |
| 136 | Single Number | C++ | Medium |
| 135 | Candy | C++ | Hard |
| 134 | Gas Station | C++ | Medium |
| 133 | Clone Graph | C++ | Medium |
| 132 | Palindrome Partitioning II | C++ | Hard |
| 131 | Palindrome Partitioning | C++ | Medium |
| 130 | Surrounded Regions | C++ | Medium |
| 129 | Sum Root to Leaf Numbers | C++, Python | Medium |
| 128 | Longest Consecutive Sequence | C++, Python | Medium |
| 127 | Word Ladder | C++ | Medium |
| 126 | Word Ladder II | C++ | Hard |
| 125 | Valid Palindrome | C++, Java | Easy |
| 124 | Binary Tree Maximum Path Sum | C++, Java | Hard |
| 123 | Best Time to Buy and Sell Stock III | C++ | Hard |
| 122 | Best Time to Buy and Sell Stock II | C++ | Medium |
| 121 | Best Time to Buy and Sell Stock | C++ | Medium |
| 120 | Triangle | C++, Java | Medium |
| 119 | Pascal's Triangle II | C++ | Easy |
| 118 | Pascal's Triangle | C++ | Easy |
| 117 | Populating Next Right Pointers in Each Node II | C++, Python | Hard |
| 116 | Populating Next Right Pointers in Each Node | C++, Python | Medium |
| 115 | Distinct Subsequences | C++ | Hard |
| 114 | Flatten Binary Tree to Linked List | C++, Python | Medium |
| 113 | Path Sum II | C++, Python | Medium |
| 112 | Path Sum | C++ | Easy |
| 111 | Minimum Depth of Binary Tree | C++ | Easy |
| 110 | Balanced Binary Tree | C++, Java | Easy |
| 109 | Convert Sorted List to Binary Search Tree | C++ | Medium |
| 108 | Convert Sorted Array to Binary Search Tree | C++ | Medium |
| 107 | Binary Tree Level Order Traversal II | C++ | Easy |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | C++, Python | Medium |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | C++, Python | Medium |
| 104 | Maximum Depth of Binary Tree | C++, Java | Easy |
| 103 | Binary Tree Zigzag Level Order Traversal | C++, Python | Medium |
| 102 | Binary Tree Level Order Traversal | C++, Java | Easy |
| 101 | Symmetric Tree | C++ | Easy |
| 100 | Same Tree | C++ | Easy |
| 99 | Recover Binary Search Tree | C++ | Hard |
| 98 | Validate Binary Search Tree | C++, Java, Python | Medium |
| 97 | Interleaving String | C++ | Hard |
| 96 | Unique Binary Search Trees | C++, Python | Medium |
| 95 | Unique Binary Search Trees II | C++, Python | Medium |
| 94 | Binary Tree Inorder Traversal | C++ | Medium |
| 93 | Restore IP Addresses | C++ | Medium |
| 92 | Reverse Linked List II | C++, Java, Python | Medium |
| 91 | Decode Ways | C++ | Medium |
| 90 | Subsets II | C++, Java | Medium |
| 89 | Gray Code | C++ | Medium |
| 88 | Merge Sorted Array | C++ | Easy |
| 87 | Scramble String | C++ | Hard |
| 86 | Partition List | C++, Python | Medium |
| 85 | Maximal Rectangle | C++ | Hard |
| 84 | Largest Rectangle in Histogram | C++ | Hard |
| 83 | Remove Duplicates from Sorted List | C++ | Easy |
| 82 | Remove Duplicates from Sorted List II | C++, Python | Medium |
| 81 | Search in Rotated Sorted Array II | C++ | Medium |
| 80 | Remove Duplicates from Sorted Array II | C++ | Medium |
| 79 | Word Search | C++ | Medium |
| 78 | Subsets | C++, Java, Python | Medium |
| 77 | Combinations | C++ | Medium |
| 76 | Minimum Window Substring | C++ | Hard |
| 75 | Sort Colors | C++ | Medium |
| 74 | Search a 2D Matrix | C++, Java | Medium |
| 73 | Set Matrix Zeroes | C++ | Medium |
| 72 | Edit Distance | C++ | Hard |
| 71 | Simplify Path | C++ | Medium |
| 70 | Climbing Stairs | C++, Java | Easy |
| 69 | Sqrt(x) | C++ | Medium |
| 68 | Text Justification | C++ | Hard |
| 67 | Add Binary | C++ | Easy |
| 66 | Plus One | C++ | Easy |
| 65 | Valid Number | C++ | Easy |
| 64 | Minimum Path Sum | C++, Java | Medium |
| 63 | Unique Paths II | C++, Java | Medium |
| 62 | Unique Paths | C++, Java | Medium |
| 61 | Rotate List | C++ | Medium |
| 60 | Permutation Sequence | C++ | Medium |
| 59 | Spiral Matrix II | C++ | Medium |
| 58 | Length of Last Word | C++, Java | Easy |
| 57 | Insert Interval | C++ | Hard |
| 56 | Merge Intervals | C++ | Hard |
| 55 | Jump Game | C++, Python | Medium |
| 54 | Spiral Matrix | C++ | Medium |
| 53 | Maximum Subarray | C++, Java | Medium |
| 52 | N-Queens II | C++ | Hard |
| 51 | N-Queens | C++ | Hard |
| 50 | "Pow(x, n)" | C++, Java | Medium |
| 49 | Group Anagrams | C++ | Medium |
| 48 | Rotate Image | C++, Java | Medium |
| 47 | Permutations II | C++ | Hard |
| 46 | Permutations | C++ | Medium |
| 45 | Jump Game II | C++ | Hard |
| 44 | Wildcard Matching | C++ | Hard |
| 43 | Multiply Strings | C++ | Medium |
| 42 | Trapping Rain Water | C++ | Hard |
| 41 | First Missing Positive | C++, Python | Hard |
| 40 | Combination Sum II | C++ | Medium |
| 39 | Combination Sum | C++ | Medium |
| 38 | Count and Say | C++, Java | Easy |
| 37 | Sudoku Solver | C++ | Hard |
| 36 | Valid Sudoku | C++ | Easy |
| 35 | Search Insert Position | C++, Java | Medium |
| 34 | Search for a Range | C++, Java | Medium |
| 33 | Search in Rotated Sorted Array | C++, Java | Hard |
| 32 | Longest Valid Parentheses | C++ | Hard |
| 31 | Next Permutation | C++ | Medium |
| 30 | Substring with Concatenation of All Words | C++ | Hard |
| 29 | Divide Two Integers | C++ | Medium |
| 28 | Implement strStr() | C++, Java | Easy |
| 27 | Remove Element | C++ | Easy |
| 26 | Remove Duplicates from Sorted Array | C++, Java | Easy |
| 25 | Reverse Nodes in k-Group | C++ | Hard |
| 24 | Swap Nodes in Pairs | C++ | Medium |
| 23 | Merge k Sorted Lists | C++ | Hard |
| 22 | Generate Parentheses | C++ | Medium |
| 21 | Merge Two Sorted Lists | C++ | Easy |
| 20 | Valid Parentheses | C++ | Easy |
| 19 | Remove Nth Node From End of List | C++, Python | Easy |
| 18 | 4Sum | C++ | Medium |
| 17 | Letter Combinations of a Phone Number | C++ | Medium |
| 16 | 3Sum Closest | C++ | Medium |
| 15 | 3Sum | C++ | Medium |
| 14 | Longest Common Prefix | C++ | Easy |
| 13 | Roman to Integer | C++ | Easy |
| 12 | Integer to Roman | C++ | Medium |
| 11 | Container With Most Water | C++, Java | Medium |
| 10 | Regular Expression Matching | C++ | Hard |
| 9 | Palindrome Number | C++, Java | Easy |
| 8 | String to Integer (atoi) | C++ | Easy |
| 7 | Reverse Integer | C++ | Easy |
| 6 | ZigZag Conversion | C++ | Easy |
| 5 | Longest Palindromic Substring | C++ | Medium |
| 4 | Median of Two Sorted Arrays | C++ | Hard |
| 3 | Longest Substring Without Repeating Characters | C++ | Medium |
| 2 | Add Two Numbers | C++ | Medium |
| 1 | Two Sum | C++, Go | Easy |