1608. Special array with x elements greater than or equal to x

//1608. Special array with x elements greater than or equal to x

class Solution {
    public int specialArray(int[] nums) {
        Arrays.sort(nums);
        int n = nums.length;

        for(int i = 0; i < n; i++) {
            if(nums[i] >= (n - i)) {
                if(i == 0 || nums[i - 1] < (n - i)) {
                    return n - i;
                }
            }
        }
        
        return -1;
    }
}