高精度板子

//+= *= -= /= operator前面都有& 
#include<cstdio>
#include<iostream>
#include<string>
#include<vector>
using namespace std;
struct Wint:vector<int>{
    Wint(int n=0){
        push_back(n);
        check();
    }
    Wint &check()
    {
        while(!empty()&&!back()) pop_back();
        if(empty()) return *this;
        for(int i=1;i<size();i++){
            (*this)[i]+=(*this)[i-1]/10;
            (*this)[i-1]%=10;
        }
        while(back()>=10){
            push_back(back()/10);
            (*this)[size()-2]%=10;
        }
        return *this;
    }
};
bool operator <(const Wint &a,const Wint &b)
{
    if(a.size()!=b.size()) return a.size()<b.size();
    for(int i=a.size()-1;i>=0;i--)
    if(a[i]!=b[i]) return a[i]<b[i];
}
bool operator>=(const Wint &a,const Wint &b)
{
    return !(a<b);
}
Wint &operator -=(Wint &a,Wint b)
{
    if(a<b) swap(a,b);
    for(int i=0;i<b.size();a[i]-=b[i],i++)
    if(a[i]<b[i]){
        int j=i+1;
        while(!a[j]) j++;
        while(j>i){
            a[j]--;
            a[--j]+=10;
        }
    }
    return a.check();
}
Wint operator-(Wint a,Wint b)
{
    return a-=b;
}
Wint &operator +=(Wint &a,Wint b)
{
    if(a.size()<b.size()) a.resize(b.size());
    for(int i=0;i<b.size();i++) a[i]+=b[i];
    return a.check();
}
Wint operator + (Wint a,Wint b)
{
    return a+=b;
}
Wint operator *(Wint a,Wint b)
{
    Wint ans;
    ans.assign(a.size()+b.size()-1,0);
    for(int i=0;i<a.size();i++)
    for(int j=0;j<b.size();j++){
        ans[i+j]+=a[i]*b[j];
    }
    return ans.check();
}
Wint divmod(Wint &a,Wint b)
{
    Wint ans;
    for(int t=a.size()-b.size();a>=b;t--){
        Wint d;
        d.assign(t+1,0);
        d.back()=1;
        Wint c=d*b;
        while(a>=c){
            ans+=d;
            a-=c;
        }
    }
    return ans.check();
}
Wint operator/(Wint a,Wint b)
{
    return divmod(a,b);
}
int main()
{
    //vec越先进去的是位数 位数高的再vector的后面 
    string aa,bb;
    Wint a,b;
    cin>>aa>>bb; 
    for(int i=aa.size()-1;i>=0;i--) a.push_back(aa[i]-'0');
    for(int i=bb.size()-1;i>=0;i--) b.push_back(bb[i]-'0');
    Wint ans;
    ans=a/b;
    ans=a-b;
    ans=a+b;
    ans=a/b;
    for(int i=ans.size()-1;i>=0;i--) printf("%d",ans[i]);
    return 0;
}