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LeetCode solutions

2892. Check if Array is Good

My accepted Python solution to LeetCode problem 2892, Check if Array is Good, running in 4ms.

  • Difficulty: Easy
  • Python
  • Runtime 4ms
  • Memory 17.5MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

Python

Accepted on LeetCode — runtime 4ms, memory 17.5MB, accepted 2026-01-01.

python
class Solution:
    def isGood(self, nums: List[int]) -> bool:
        n = len(nums) - 1  # n for base[n]
        if n < 1:
            return False
        
        # Expected: [1, 2, ..., n-1, n, n]
        # Check if sorted nums matches expected
        nums.sort()
        
        for i in range(n - 1):
            if nums[i] != i + 1:
                return False
        
        # Last two elements should both be n
        return nums[n - 1] == n and nums[n] == n

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