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  1. #include<cstdio>
  2. #include<iostream>
  3. #include<cstdlib>
  4. #include<cmath>
  5. #include<cstring>
  6. #include<climits>
  7. #include<algorithm>
  8. #include<vector>
  9. #include<set>
  10. #include<map>
  11. #include<bitset>
  12. #include<stack>
  13. #include<queue>
  14. #include<stdio.h>
  15. #include<string.h>
  16. #include<math.h>
  17. #include<functional>
  18. #include<numeric>
  19. using namespace std;
  20.  
  21. #define sz(a) int((a).size())
  22. #define all(c) c.begin(),c.end() //all elements of a container
  23. #define rall(c) c.rbegin(),c.rend() 
  24. #define INF		INT_MAX
  25. #define FOR(i,a,b) 	for(int  i= (int )a ; i < (int )b ; ++i)
  26. #define rep(i,n) 	FOR(i,0,n)
  27. #define FORAB(i,a,b)      for(int i=(int)a; i<=b; i++)
  28. #define PB push_back
  29. #define MP make_pair
  30. #define fill(a,b) memset(a,b,sizeof(a))
  31. #define mod (int)(1e9 + 7)
  32. #define F first
  33. #define S second
  34. #define asd(x) cout << "Here for " << #x << " :" <<x << endl
  35. #define asdf(x, y)  cout << "Here FOR " << #x << " :" << x << " " << #y  << " :" << y << endl
  36. #define si(n) scanf("%d",&n)
  37. #define pi(n) printf("%d ",n)
  38. #define pil(n) printf("%d\n",n)
  39. #define pl(n) printf("%lld ",n)
  40. #define pll(n) printf("%lld\n",n)
  41. #define sl(n) scanf("%lld",&n)
  42. #define sd(n) scanf("%lf",&n)
  43. #define ss(n) scanf("%s",n)
  44.  
  45. typedef long long int LL;
  46. typedef vector <int> VI;
  47. typedef pair < int ,int > PII;
  48. int main()
  49. {
  50. 	LL n=0,digit=0,temp=0,ans=0,t=0,no=0,calc=0,ne=0,nn=0,teee=0;
  51. 	//sl(n);
  52. 	cin>>n;
  53. 	temp=n;
  54. 	while(temp!=0)
  55.   	{
  56.       temp/=10; 
  57.       //pil(temp);
  58.       digit++;
  59.  	}
  60.  	//cout<<digit<<endl;
  61.  	//pil(digit);
  62.  	//asd(digit);
  63.  	ans=0; t=0; no=0; calc=1;
  64.  	for (LL i=1;i<digit;i++)
  65.  	{
  66.  		t=i-1;
  67.  		no=(calc*9);
  68. 		calc*=10;
  69.  		ans+=(no*i);
  70.  	}
  71.  	//pll(ans);
  72.  	ne=((pow(10,digit-1))-1);
  73.  	//pil
  74.  	//asd(ne);
  75.  	nn=(n-ne);
  76.  	//asd(nn);
  77.  	//ans+=
  78.  	teee=(nn*digit);
  79.  	//asd(teee);
  80.  	ans+=teee;
  81.  	//pll(ans);
  82.  	cout<<ans<<endl;
  83. 	return 0;
  84. }
  85.  
  86.  
  87.  
Success #stdin #stdout 0s 3100KB
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https://ideone.com/AZc19G
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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