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dsa2 min read

Convert a fraction to decimal string with recurring part detected via remainder position tracking.

March 19, 2026Read →

dsa1 min read

Find all duplicate subtrees by serializing each subtree and tracking serialization counts in a hash map.

March 19, 2026Read →

dsa2 min read

Implement a hash map from scratch using an array of buckets with chaining for collision resolution.

March 19, 2026Read →

dsa2 min read

Implement a hash set from scratch supporting add, remove, and contains in O(1) average time.

March 19, 2026Read →

dsa2 min read

Pick a random index of a target value with equal probability using reservoir sampling over the array.

March 19, 2026Read →

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