适合新手

想必各位新手想试着挑战2级的超纲题，刚学到循环，看这道题是循环的，就来做了，结果不会，想看题解，看别人是怎么做的，结果要么是函数，要么是数组，根本看不懂，如果你是，就来看看我的吧！只用了while,if,int,cin,cout

#include <bits/stdc++.h>
using namespace std;
int main (){
    int a;
    cin >> a;
    int b=0;
    int zuixiaoshu=0;
    int zhongjianshu=0;
    int zuidashu=0;
    int zuida=0;
    int zuixiao=0;
    while (a!=495){
        int yzx=a%10;
        int zxm=a/10%10;
        int yhp=a/100;
        if (yhp>zxm && yhp>yzx){
            zuidashu=yhp;
        }else if(yzx>zxm && yzx>yhp){
            zuidashu=yzx;
        }else if(zxm>yhp &&zxm >yzx){
            zuidashu=zxm;
        }
        if(yzx<yhp && yzx <zxm){
            zuixiaoshu=yzx;
        }else if(zxm<yhp && zxm<yzx){
            zuixiaoshu=zxm;
        }else{
            zuixiaoshu=yhp;
        }
        if (yzx!=zuixiaoshu && yzx!=zuixiaoshu){
            yzx=zhongjianshu;
        }else if (zxm!=zuixiaoshu && zxm!=zuixiaoshu){
            zxm=zhongjianshu;
        }else if (yhp!=zuixiaoshu && yhp!=zuixiaoshu){
            yhp=zhongjianshu;
        }
        zuida=zuidashu*100+zhongjianshu*10+zuixiaoshu;
        zuixiao=zuixiaoshu*100+zhongjianshu*10+zuidashu;
        a=zuida-zuixiao;
        b++;
    }
    cout <<b;
    return 0;
}