A clean warm-up for hashing, trade-offs, and explaining an approach out loud. Compare the brute-force and hash-map paths, then write down the invariant before coding.
Pairing access
The call opens after the room owner accepts your request. It keeps every session small, intentional, and focused on the brief.
Read this before you enter the session.
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A clean warm-up for hashing, trade-offs, and explaining an approach out loud.
Jam plan
Compare the brute-force and hash-map paths, then write down the invariant before coding.
Problem statement
Given an array of integers nums and an integer target, return the indices of the two numbers whose sum is target. You may assume exactly one solution exists, and you may not use the same element twice.
Constraints
Examples
Input: nums = [2, 7, 11, 15], target = 9
Output: [0, 1]
nums[0] + nums[1] equals 9.
Run and Submit open the official LeetCode page, where your own platform account handles execution and submission.