#include <iostream>
using namespace std;
int main()
{
    int n,d,x;//d=大，x=小
    cin >> n;
    int k1=n/1000+n%1000/100*10+n%100/10*100+n%10*1000;//k1=n的倒序
    if (k1>n)//算出最大值
    {
        d=k1;
        x=n;
    }
    else
    {
        d=n;
        x=k1;
    }
    cout << d << '-' << x << '=' << d-x;//打印出算式
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int x;
    cin>>x;
    int y=x%10*1000+x/10%10*100+x/100%10*10+x/1000;
    cout<<max(x,y)<<"-"<<min(x,y)<<"="<<abs(x-y);
    return 0;
}

#include <bits/stdc++.h> 
using namespace std;
int main()
{
    int num,a,b,c,d,n2;
    cin >> num;
    a = num/1000;
    b= num/100%10;
    c = num/10%10;
    d = num%10;//计算出原数个数位的数字
    n2 = a+b*10+c*100+d*1000;
    if(num>n2)
        cout << num << "-" << n2 << "=" <<num-n2;
    else
        cout << n2 <<"-"<<num<<"="<<n2 - num;
    return 0;
}

补充个样例说明一下，试了好久才出来 example: @input 1000 @output 1000-0001=0999