my code is
#include
using namespace std;
int stoi(string s,int i,int number,int len)
{
if(i==len)
{
return number;
}
number=number*10+s[i]-'0';
stoi(s,i+1,number,len);
}
int main() {
string s;
cin>>s;
cout<<stoi(s,0,0,s.length());
return 0;
}
input 1234
output 1
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