int main () {stringstream s, int n; cin

C / C + + is a multi-paradigm language medium level, object-oriented, widely used in the software industry due to the balance between speed and complexity. If you have any questions about this language or do you want to learn something yourself, go here.
Re: figures
int main () {stringstream s, int n; cin >> n, for (int i = 1; i <= n, i + +) s << i; cout << s.str (). length () return 0 ;}
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