Open Source Knowledge Base

Green-Ticks✅

A curated collection of 137 coding problems, solutions, templates, and notes — organized, tagged, and searchable.

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137Problems

24Topics

202Companies

3Platforms

8Templates

71Notes

Difficulty Breakdown

Easy32

Medium54

Hard48

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Problems

All coding problems organized by difficulty

137 problems

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Topics

Browse by algorithm & data structure topics

24 problems

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Companies

Problems asked at specific companies

202 problems

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Platforms

Problems from different coding platforms

3 problems

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Groups

Custom problem groupings

4 problems

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Templates

Reusable algorithm templates & patterns

8 problems

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Notes

In-depth topic explanations & guides

71 problems

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Green-Ticks✅

Difficulty Breakdown

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Problems

Topics

Companies

Platforms

Groups

Templates

Notes

Popular Topics

Arrays

Searching

Hashing

Greedy

Maths

Strings

Stack

Two Pointers

Top Companies

Amazon

Google

Microsoft

Meta

Bloomberg

Apple

Goldman Sachs

Adobe

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Intervals & Ranges Pattern (Sorting)

Monotonic Deque