link

分割线

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玄关求调啦。。

代码：

#include<bits/stdc++.h>
using namespace std;
int n;
string s="";
int main(){
	cin>>n;
	while(n--){
		char op;
		cin>>op;
		if(op=='+'){
			string s1;
			cin>>s1;
			s=s+s1;
		}else if(op=='*'){
			int k;
			string s1=s;
			cin>>k;
			for(int i=1;i<=k-1;i++){
				s=s+s1;
			}
		}else if(op=='%'){
			int k;
			cin>>k;
			if(k>s.length())
			    continue;
			s=s.substr(0,k-1);
		}
	}
	cout<<s;
	return 0;
}