0914. X of a Kind in a Deck of Cards

https://leetcode.com/problems/x-of-a-kind-in-a-deck-of-cards

Description

In a deck of cards, each card has an integer written on it.

Return true if and only if you can choose X >= 2 such that it is possible to split the entire deck into 1 or more groups of cards, where:

• Each group has exactly X cards.

• All the cards in each group have the same integer.

Example 1:

**Input:** deck = [1,2,3,4,4,3,2,1]
**Output:** true
**Explanation**: Possible partition [1,1],[2,2],[3,3],[4,4].

Example 2:

**Input:** deck = [1,1,1,2,2,2,3,3]
**Output:** false
**Explanation**: No possible partition.

Example 3:

**Input:** deck = [1]
**Output:** false
**Explanation**: No possible partition.

Example 4:

**Input:** deck = [1,1]
**Output:** true
**Explanation**: Possible partition [1,1].

Example 5:

**Input:** deck = [1,1,2,2,2,2]
**Output:** true
**Explanation**: Possible partition [1,1],[2,2],[2,2].

Constraints:

• 1 <= deck.length <= 104

• 0 <= deck[i] < 104

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