Medium

11. Two-Pointer Technique (Two Sum / Reversal)

Problem Objective

Given an array nums and target target, return indices of two numbers that add up to target in O(N) linear time using a dictionary.

Expected Terminal OutputStandard Out

[*] Output indices: [0, 1]

[✓] Hash map lookup verified (Time: 0.016s, Memory: 14.1 MB)

Execution Constraints

Implementation Checklist

Initialize hash map seen = {}Iterate with enumerate(nums)Calculate complementReturn [seen[comp], i]

solution.pypython3 (CPython 3.12)

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