按照题目要求，用高精虐一波题，没想到被题目虐了。。。

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=30;
int a[N],b[N],c[N];
string div(string A){ // A整除2
    memset(c,0,sizeof(c));
    memset(a,0,sizeof(a));
    for (int i=0;i<A.size();i++){
		a[i]=A[i]-'0';
		//cout<<a[i];
	}
	//cout<<endl;
    int t=0;
    for (int i=0;i<A.size();i++){
        int q=t*10+a[i];
        //cout << "q:  "<<1<<"   ";
        c[i]=q/2;
        t=q%2;
        //cout<<"t:  "<<t<<"   "<<"c[i]:   "<<c[i]<<"   "<<"a[i]:   "<<a[i]<<endl;
    }
    string ans="";
    int f=0;
    for (int i=0;i<A.size();i++){
        if (f!=0||c[i]!=0){
            f=1;
            ans=ans+char(c[i]+'0');
        }
    }
    return ans;
}
bool com(string A){
    int n=A.size();
    if (n==1){
        return stoi(A)>=2;
    }
    else return true;
}
string times(string A){//A*2
    memset(a,0,sizeof(a));
    memset(c,0,sizeof(c));
    for (int i=A.size()-1;i>=0;i--){
		a[i]=A[i]-'0';
		//cout << a[i]<<" ";
	}
    //cout<<endl;
    int t=0;
    for (int i=0;i<A.size();i++){
        c[i]=(a[i]*2+t)%10;
        t=a[i]*2/10;
        //cout<<"t:  "<<t<<"   "<<"c[i]:   "<<c[i]<<"   "<<"a[i]:   "<<a[i]<<endl;
    }
    int f=0;
    string ans="";
    for (int i=A.size();i>=0;i--){
        if (f!=0||c[i]!=0){
            f=1;
            ans=char(c[i]+'0')+ans;
        }
    }
    return ans;
}
string plus1(string A){
    int n=A.size()-1;
    A[n]=char(((A[n]-'0')+1)+'0');
    return A;
}
signed main(){    
//	cout<<plus1("123")<<endl;
//    cout<<times("123")<<endl;
//    cout<<div("13")<<endl;
//    cout<<div("103")<<endl;
//    cout<<com("1")<<"  "<<com("3")<<endl;
    int n;
    string s;
    cin>>n>>s;
    string q;
    cin>>q;
    for (char c:q){
        if (c=='U'&&com(s)){
            s=div(s);
        }
        else if (c=='L')s=times(s);
        else if (c=='R'){
            string d=times(s);
            s=plus1(d);
        }
    }
    cout << s << endl;

    return 0;
}

求调QWQWQW!!