Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order.
Example
nums = [2, 7, 11, 15], target = 9 → [0, 1]
Constraints
2 ≤ n ≤ 10⁴ · −10⁹ ≤ nums[i] ≤ 10⁹ · Exactly one valid answer exists
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