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- #include<bits/stdc++.h>
- using namespace std;
- string ree(string x);
- int main()
- {
- int x,i;
- string s,c;
- cin>>s >>x;
- c = s;
- for(i =1;i<x;i++)
- {
- s+=c;
- }
- //cout<<s<<endl;
- cout<<ree(s)<<endl;
- return 0;
- }
- string ree(string x)
- {
- // cout<<"size "<<x.size()<<endl;
- if(x.length()==1)
- {
- return x;
- }
- if(x.length()>=2)
- {
- int sum=0;
- for(int i=0;i<x.length();i++)
- {
- sum+= x[i]-'0';
- // cout<<sum<<endl;
- }
- x = to_string(sum);
- return ree(x);
- }
- }
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