DSA Crash Course

Home Study Problems Patterns Redo Weekly Progress

Template: then copy the matching template below into your solution file.
Template: Template index — find the right template fast:
Template: 1. TWO POINTERS — Opposite Direction
Template: 2. TWO POINTERS — Same Direction (Fast/Slow)
Template: 3. SLIDING WINDOW — Variable Size
Template: 4. SLIDING WINDOW — Fixed Size K
Template: 5. BINARY SEARCH — Universal Template
Template: 6. BFS — Level-Order / Shortest Path
Template: 7. DFS — Recursive
Template: 8. DFS on Grid — Flood Fill / Island Counting
Template: 9. BACKTRACKING — Universal Template
Template: 10. DYNAMIC PROGRAMMING — 1D Template
Template: 11. DYNAMIC PROGRAMMING — 2D Template (Two Strings)
Template: 12. MONOTONIC STACK — Next Greater Element
Template: 13. PREFIX SUM
Template: 14. UNION-FIND (Disjoint Set)
Template: 15. TRIE
Template: 16. DIJKSTRA — Shortest Path (Weighted Graph)
Template: 17. TOPOLOGICAL SORT — Kahn's Algorithm (BFS)
Template: 18. LINKED LIST — Reverse
Template: 19. MERGE INTERVALS
Template: 20. TWO HEAPS — Running Median
Template: 21. BUILD GRAPH FROM EDGE LIST
Template: with — beginners get stuck here before they can attempt BFS / DFS.

Templates

Template: then copy the matching template below into your solution file.

Mark when done:

then copy the matching template below into your solution file.

Interview Simulation — Overview

Template: Template index — find the right template fast:

DSA Crash Course · open source · GitHubAll progress stored locally in your browser.