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export default function specialArray(nums: number[]): number {    nums.sort((a, b) => a - b);    const n = nums.length;    if (nums[0] >= n) return n;    for (let i = 1; i < n; i++) {        if (nums[n - i] >= i && nums[n - 1 - i] < i) return i;    }    return -1;}