Learn DSA Through Visualizations
A visual guide to the most important patterns and approaches for the coding interview.
This guide uses interactive visualizations to teach you the most important algorithm patterns for the coding interview.
Done | Problem / Lesson | Difficulty |
|---|---|---|
Two Pointers (7 problems)0% | Lesson | |
Container With Most Water | Medium | |
Two Sum (Sorted Array) | Medium | |
3-Sum | Medium | |
Triangle Numbers | Medium | |
Move Zeroes | Easy | |
Sort Colors | Medium | |
Trapping Rain Water | Hard | |
Sliding Window (5 problems)0% | Lesson | |
Maximum Sum of Subarrays of Size K | Easy | |
Max Points You Can Obtain From Cards | Medium | |
Max Sum of Distinct Subarrays Length k | Medium | |
Longest Substring Without Repeating Characters | Medium | |
Longest Repeating Character Replacement | Medium | |
Intervals (5 problems)0% | Lesson | |
Can Attend Meetings | Easy | |
Insert Interval | Medium | |
Non-Overlapping Intervals | Medium | |
Merge Intervals | Medium | |
Employee Free Time | Hard | |
Stack (5 problems)0% | Lesson | |
Valid Parentheses | Easy | |
Decode String | Medium | |
Longest Valid Parentheses | Hard | |
Daily Temperatures | Medium | |
Largest Rectangle in Histogram | Hard | |
Linked List (5 problems)0% | Lesson | |
Linked List Cycle | Easy | |
Palindrome Linked List | Easy | |
Remove Nth Node From End of List | Medium | |
Reorder List | Medium | |
Swap Nodes in Pairs | Medium | |
Binary Search (2 problems)0% | Lesson | |
Apple Harvest (Koko Eating Bananas) | Medium | |
Search in Rotated Sorted Array | Medium | |
Heap (4 problems)0% | Lesson | |
Kth Largest Element in an Array | Medium | |
K Closest Points to Origin | Medium | |
Find K Closest Elements | Medium | |
Merge K Sorted Lists | Hard | |
Depth-First Search (13 problems)0% | Lesson | |
Maximum Depth of Binary Tree | Easy | |
Path Sum | Easy | |
Validate Binary Search Tree | Medium | |
Calculate Tilt | Easy | |
Diameter of a Binary Tree | Easy | |
Path Sum II | Medium | |
Longest Univalue Path | Medium | |
Copy Graph | Easy | |
Graph Valid Tree | Medium | |
Flood Fill | Easy | |
Number of Islands | Medium | |
Surrounded Regions | Medium | |
Pacific Atlantic Water Flow | Medium | |
Breadth-First Search (8 problems)0% | Lesson | |
Level Order Sum | Easy | |
Rightmost Node | Medium | |
Zigzag Level Order | Medium | |
Maximum Width of Binary Tree | Medium | |
Minimum Knight Moves | Medium | |
Rotting Oranges | Medium | |
01-Matrix | Medium | |
Bus Routes | Hard | |
Backtracking (4 problems)0% | Lesson | |
Word Search | Medium | |
Subsets | Medium | |
Generate Parentheses | Medium | |
Combination Sum | Medium | |
Graphs (2 problems)0% | Lesson | |
Course Schedule | Medium | |
Course Schedule II | Medium | |
Dynamic Programming (7 problems)0% | Lesson | |
Counting Bits | Easy | |
Decode Ways | Medium | |
Maximal Square | Medium | |
Unique Paths | Medium | |
Longest Increasing Subsequence | Medium | |
Word Break | Medium | |
Maximum Profit in Job Scheduling | Medium | |
Greedy Algorithms (3 problems)0% | Lesson | |
Best Time to Buy and Sell Stock | Easy | |
Gas Station | Medium | |
Jump Game | Medium | |
Trie (2 problems)0% | Lesson | |
Implement Trie Methods | Medium | |
Prefix Matching | Medium | |
Prefix Sum (2 problems)0% | Lesson | |
Count Vowels in Substrings | Medium | |
Subarray Sum Equals K | Medium | |
Matrices (3 problems)0% | Lesson | |
Spiral Matrix | Medium | |
Rotate Image | Medium | |
Set Matrix Zeroes | Medium |