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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. const ll MaxN=1e18;
  5.  
  6. int main() {
  7. 	/*ll q;
  8. 	cin >>q;
  9. 	ll num;
  10.  
  11. 	while(q--){
  12. 		cin>>num;
  13. 	}*/
  14. 	ll a=1;
  15. 	ll b=9;
  16. 	ll ans=0;
  17. 	while(ans<MaxN){
  18. 		ans+=(a*b);
  19. 		a++;
  20. 		b*=10;
  21. 	}
  22. 	cout << a;
  23. 	//while
  24. }
Success #stdin #stdout 0.01s 5312KB
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18
https://ideone.com/D2EFYc
language:
C++14 (gcc 8.3)
created:
8 days ago
visibility:
public

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