BigInteger过于好用

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[10000];
        int sum = 0;
        int index = 0;
        BigInteger multiple = BigInteger.valueOf(1);
        if (n == 3) {
            arr[0] = 1;
        }
        for (int i = 2; i < n; ++i) {
            sum += i;
            arr[i] = i;
            if (sum >= n) {
                index = i;
                break;
            }
        }
        int differ = sum - n;
        if (sum > n) {
            if (differ == 1) {
                arr[2] = 0;
                arr[index]++;
                if (arr[index] == n) {
                    arr[0] = 1;
                    arr[index]--;
                }
            } else {
                arr[differ] = 0;
            }
        }
        for (int i = 0; i < n; ++i) {
            if (arr[i] != 0) {
                multiple = multiple.multiply(BigInteger.valueOf(arr[i]));
                System.out.print(arr[i] + " ");
            }
        }
        System.out.println();
        System.out.println(multiple);
    }
}