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`, move all 0's to the end of it while maintaining the relative order of the non-zero elements. Note that you must do this in-place without making a copy of the array. (For testing here, return the modified array so the runner can compare it.)
Example
nums = [0, 1, 0, 3, 12] → [1, 3, 12, 0, 0]
Constraints
1 ≤ nums.length ≤ 10⁴ · −2³¹ ≤ nums[i] ≤ 2³¹ − 1
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