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Popular Problems
Brain Dump
Jun 15, 2025
43 views
Easy
Design Parking System (87.1%)
Make Array Zero by Subtracting Equal Amounts (73.3%)
Maximum Units on a Truck (74.3%)
Medium
LRU Cache (45.2%)
Number of Islands (62.3%)
Reorganize String (56.2%)
Meeting Rooms II (52.1%)
Group Anagrams (70.9%)
Analyze User Website Visit Pattern (43.7%)
Minimum Health to Beat Game (58.7%)
Design Tic-Tac-Toe (58.6%)
Copy List with Random Pointer (60.5%)
Rotting Oranges (56.6%)
Course Schedule (49.2%)
Search Suggestions System (65.0%)
K Closest Points to Origin (67.9%)
All Nodes Distance K in Binary Tree (66.4%)
Plates Between Candles (46.6%)
Find Triangular Sum of an Array (78.8%)
Number of Ways to Select Buildings (50.5%)
Sequential Digits (65.3%)
Maximum Length of Subarray With Positive Product (44.4%)
Find Good Days to Rob the Bank (50.4%)
Reorder Data in Log Files (56.8%)
Minimum Adjacent Swaps to Make a Valid Array (72.2%)
Sum of Subarray Ranges (60.1%)
Minimum Number of Swaps to Make the Binary String Alternating (43.4%)
Design an Expression Tree With Evaluate Function (82.4%)
Minimum Number of Keypresses (71.3%)
Hard
Trapping Rain Water (65.1%)
Integer to English Words (34.4%)
Word Ladder (42.8%)
Design In-Memory File System (48.2%)
Find Median from Data Stream (53.3%)
Sliding Window Maximum (47.6%)
Word Break II (53.6%)
Minimum Number of Moves to Make Palindrome (52.0%)
Concatenated Words (49.4%)
Maximum Number of Books You Can Take (39.3%)
Find the K-Sum of an Array (39.6%)
Race Car (44.1%)
Sum of Total Strength of Wizards (28.3%)
Find K-th Smallest Pair Distance (45.8%)
Count Unique Characters of All Substrings of a Given String (52.9%)
Substring With Largest Variance (45.9%)
Total Appeal of A String (55.8%)
Build Binary Expression Tree From Infix Expression (62.5%)
Sequentially Ordinal Rank Tracker (61.7%)
Maximum Number of Robots Within Budget (36.8%)
Additional Categories
Design Problems:
146. LRU Cache
Design Tic-Tac-Toe
Design Parking System
Design In-Memory File System
Design an Expression Tree
Tree/Graph Problems:
200. Number of Islands
All Nodes Distance K in Binary Tree
Boundary of Binary Tree
Word Ladder (BFS)
String Manipulation:
767. Reorganize String
Group Anagrams
Minimum Moves to Make Palindrome
Substring With Largest Variance
Dynamic Programming / Sliding Window:
42. Trapping Rain Water
Sliding Window Maximum
Word Break II
Maximum Length of Subarray With Positive Product
Heap / Priority Queue:
253. Meeting Rooms II
Find Median from Data Stream
K Closest Points to Origin
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Written by Brain Dump
Easy
Medium
Hard
Additional Categories
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