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
Alice has some number of cards and she wants to rearrange the cards into groups so that each group is of size `groupSize`, and consists of `groupSize` consecutive cards. Given an integer array `hand` where `hand[i]` is the value written on the i-th card and an integer `groupSize`, return `true` if she can rearrange the cards, or `false` otherwise.
Example
hand = [1,2,3,6,2,3,4,7,8], groupSize = 3 → true
Constraints
1 ≤ hand.length ≤ 10⁴ · 0 ≤ hand[i] ≤ 10⁹ · 1 ≤ groupSize ≤ hand.length
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