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DSA Problem Ladders

Every problem in the guide, grouped by pattern and laddered easy → hard — a routed path instead of a pile. ★ marks the canonical interview must-dos. Toggle ★ Core for a fast-track set, filter by difficulty, and check off what you finish (saved in your browser).

549 problems · 115 ★core
Arrays11 · ★2
Hashing14 · ★3
Two Pointers4 · ★0
Sliding Window6 · ★1
Stack13 · ★1
Queues5 · ★0
Searching6 · ★0
Sorting7 · ★2
Linked List9 · ★3
Trees72 · ★13
Trie8 · ★2
Heap9 · ★2
Recursion19 · ★1
Backtracking4 · ★1
Graphs12 · ★3
Matrix7 · ★2
Dynamic Programming42 · ★14
Greedy6 · ★0
Divide & Conquer5 · ★0
Advanced Patterns55 · ★9
Company Practice235 · ★56