Divide Array Into Equal Pairs
You are given an integer array nums consisting of 2 * n integers.
You need to divide nums into n pairs such that:
- Each element belongs to exactly one pair.
- The elements present in a pair are equal.
Return true if nums can be divided into n pairs, otherwise return false.
Example 1
Input
nums = [3,2,3,2,2,2]Output
trueThere are 6 elements in nums, so they should be divided into 3 pairs, and the pairs (2, 2), (3, 3), and (2, 2) satisfy all the conditions.
Example 2
Input
nums = [1,2,3,4]Output
falseThere is no way to divide nums into 2 pairs such that every pair has equal elements.
Constraints
- nums.length == 2 * n
- 1 <= n <= 500
- 1 <= nums[i] <= 500