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 integer array `nums` and an integer `k`, return the *k* most frequent elements. You may return the answer in any order.
Example
nums = [1, 1, 1, 2, 2, 3], k = 2 → [1, 2]
Constraints
1 ≤ nums.length ≤ 10⁵ · −10⁴ ≤ nums[i] ≤ 10⁴ · k is in the range [1, the number of unique elements]
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