高精度/高精度

#include <bits/stdc++.h>
using namespace std;
int main(){
    string a,b;
    cin>>a>>b;
    vector<int> x,y;
    for(int i = a.size()-1;i>=0;i--){
        x.push_back(a[i]-'0');
    }
    for(int i = b.size()-1;i>=0;i--){
        y.push_back(b[i]-'0');
    }
    bool f = true;
    int j = 0,sum = 0;
    while(f){
        for(int i = 0;i<x.size();i++){
            if(i>=y.size()){
                y.push_back(0);
            }
            if(y[i]>x[i]){
                x[i+1] -= 1;
                x[i] += 10;
            }
            j = x[i]-y[i];
            x[i] = j;
            j /= 10;
        }
        if(x.size()>y.size()){
            f = true;    
        }else if(x.size()>y.size()){
            f = false;
        }else{
            for(int i = x.size()-1;i>=0;i--){
                if(x[i]>y[i]){
                    f = true;
                    break;
                }else if(y[i]>x[i]){
                    f = false;
                    break;
                }
            }
        }
        sum++;
    }
    cout<<sum<<" ";
    bool l = false;
    for(int i = x.size()-1;i>=0;i--){
        if(x[i]!=0 || l){
            cout<<x[i];
            l = true;
        }
    }
    return 0; 
}