[LeetCode] 914. X of a Kind in a Deck of Cards 一副牌中的X

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: [1,2,3,4,4,3,2,1]
Output: true
Explanation: Possible partition [1,1],[2,2],[3,3],[4,4]

Example 2:

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

Example 3:

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

Example 4:

Input: [1,1]
Output: true Explanation: Possible partition [1,1]

Example 5:

Input: [1,1,2,2,2,2]
Output: true Explanation: Possible partition [1,1],[2,2],[2,2]

Note:

1. 1 <= deck.length <= 10000
2. 0 <= deck[i] < 10000

Github 同步地址:

https://github.com/grandyang/leetcode/issues/914

参考资料：

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

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