Hand of Straights

Medium~25 min

Alice has some number of cards in her hand. 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 ith card and an integer groupSize, return true if she can rearrange the cards into groups, or false otherwise.

Examples

Example 1
Input: hand = [1,2,3,6,2,3,4,7,8], groupSize = 3
Output: true
Explanation: Alice's hand can be rearranged as [1,2,3], [2,3,4], [6,7,8].
Example 2
Input: hand = [1,2,3,4,5], groupSize = 4
Output: false
Explanation: Alice's hand cannot be rearranged into groups of 4 consecutive cards.

Constraints

  • 1 <= hand.length <= 10^4
  • 0 <= hand[i] <= 10^9
  • 1 <= groupSize <= hand.length
  • Expected time complexity: O(n log n)
Code
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Output

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