6174问题

 

#include<stdio.h>
#include<string.h>
int xd(int a[],int n)
{
	for(int i=0;i<n-1;i++)
	{
		for(int j=0;j<n-i-1;j++)
		{
			if(a[j] > a[j+1])
			{
				int temp = a[j];
				a[j] = a[j+1];
				a[j+1] = temp;
			}
		}
	}
	return (a[0]*1000+a[1]*100+a[2]*10+a[3]);
}

int dx(int a[],int n)
{
	for(int i=0;i<n-1;i++)
	{
		for(int j=0;j<n-i-1;j++)
		{
			if(a[j] < a[j+1])
			{
				int temp = a[j];
				a[j] = a[j+1];
				a[j+1] = temp;
			}
		}
	}
	return (a[0]*1000+a[1]*100+a[2]*10+a[3]);
}

void showarr(int num,int a[])
{
	for(int j=0;j<4;j++)
	{
		a[j] = 0;
	}
	int x;
	for(x = 0;num / 10 != 0;x++)
	{
		a[x] = num%10;
		num /= 10;
	}
	a[x] = num;
}

int circle(int num)
{
	int count = 1;
	int temp = num;
	int a[4];
	showarr(num,a);
	num = dx(a,4) - xd(a,4);
	if(temp == num) return 1;
	while(temp != num)
	{
		temp = num;
		showarr(num,a);
		num = dx(a,4) - xd(a,4);
		count++;
	}
	return count;
}

int main()
{
	int n;
	scanf("%d",&n);
	while(n--)
	{
		int a;
		scanf("%d",&a);
		printf("%d\n",circle(a));
	}
	
	
}