- Maximum Sum Subarray of Size K (easy)
- Smallest Subarray with a given sum (easy)
- Longest Substring with K Distinct Characters (medium)
- Fruits into Baskets (medium)
- No-repeat Substring (hard)
- Longest Substring with Same Letters after Replacement (hard)
- Longest Subarray with Ones after Replacement (hard)
- Pair with Target Sum (easy)
- Remove Duplicates (easy)
- Squaring a Sorted Array (easy)
- Triplet Sum to Zero (medium)
- Triplet Sum Close to Target (medium)
- Triplets with Smaller Sum (medium)
- Subarrays with Product Less than a Target (medium)
- Dutch National Flag Problem (medium)
- LinkedList Cycle (easy)
- Start of LinkedList Cycle (medium)
- Happy Number (medium)
- Middle of the LinkedList (easy)
- Merge Intervals (medium)
- Insert Interval (medium)
- Intervals Intersection (medium)
- Conflicting Appointments (medium)
- Cyclic Sort (easy)
- Find the Missing Number (easy)
- Find all Missing Numbers (easy)
- Find the Duplicate Number (easy)
- Find all Duplicate Numbers (easy)
- Reverse a LinkedList (easy)
- Reverse a Sub-list (medium)
- Reverse every K-element Sub-list (medium)
- Binary Tree Level Order Traversal (easy)
- Reverse Level Order Traversal (easy)
- Zigzag Traversal (medium)
- Level Averages in a Binary Tree (easy)
- Minimum Depth of a Binary Tree (easy)
- Level Order Successor (easy)
- Connect Level Order Siblings (medium)
- Binary Tree Path Sum (easy)
- All Paths for a Sum (medium)
- Sum of Path Numbers (medium)
- Path With Given Sequence (medium)
- Count Paths for a Sum (medium)
- Find the Median of a Number Stream (medium)
- Sliding Window Median (hard)
- Maximize Capital (hard)
- Subsets (easy)
- Subsets With Duplicates (easy)
- Permutations (medium)
- String Permutations by changing case (medium)
- Balanced Parentheses (hard)
- Unique Generalized Abbreviations (hard)
- Order-agnostic Binary Search (easy)
- Ceiling of a Number (medium)
- Next Letter (medium)
- Number Range (medium)
- Search in a Sorted Infinite Array (medium)
- Minimum Difference Element (medium)
- Bitonic Array Maximum (easy)
- Single Number (easy)
- Two Single Numbers (medium)
- Complement of Base 10 Number (medium)
- Top 'K' Numbers (easy)
- Kth Smallest Number (easy)
- 'K' Closest Points to the Origin (easy)
- Connect Ropes (easy)
- Top 'K' Frequent Numbers (medium)
- Frequency Sort (medium)
- Kth Largest Number in a Stream (medium)
- 'K' Closest Numbers (medium)
- Maximum Distinct Elements (medium)
- Sum of Elements (medium)
- Rearrange String (hard)
- Merge K Sorted Lists (medium)
- Kth Smallest Number in M Sorted Lists (Medium)
- Kth Smallest Number in a Sorted Matrix (Hard)
- Smallest Number Range (Hard)
- 0/1 Knapsack (medium)
- Equal Subset Sum Partition (medium)
- Subset Sum (medium)
- Minimum Subset Sum Difference (hard)
- Topological Sort (medium)
- Tasks Scheduling (medium)
- Tasks Scheduling Order (medium)
- All Tasks Scheduling Orders (hard)
- Alien Dictionary (hard)