Quick Overview

This Hudson River Trading coding question tests hash-based counting for pairs that become equivalent after a digit-reversal transform. It is useful for practicing canonicalization, duplicate accounting, and careful handling of numeric string edge cases.

Count Digit-Reversal Equivalent Pairs

Company: Hudson River Trading

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: This Hudson River Trading coding question tests hash-based counting for pairs that become equivalent after a digit-reversal transform. It is useful for practicing canonicalization, duplicate accounting, and careful handling of numeric string edge cases.

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