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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. using namespace std;
  5. #include<math.h>
  6.  
  7. int digit(int x)
  8. {
  9. 	int count=0;
  10. 	if(x==0)
  11. 	 return 1;
  12.  
  13. 	else
  14. 	 {
  15. 	 	while(x!=0)
  16. 	 	 {
  17. 	 	 	x=x/10;
  18. 	 	 	count++;
  19. 	 	 }
  20. 	 }
  21.  
  22.     return count;
  23. }
  24.  
  25. int main() {
  26. 	// your code goes here
  27.      int n;
  28.      cin>>n;
  29. 	vector<int>arr(n);
  30. 	int i=0;
  31. 	while(i<n)
  32. 	 {
  33. 	 	cin>>arr[i];
  34. 	 	i++;
  35. 	 }
  36.  
  37. 	 int sum=0;
  38. 	 int prefix[n+1]={0};
  39. 	 prefix[0]=arr[0];
  40. 	 for(int i=1;i<n;i++)
  41. 	  {
  42. 	  	prefix[i]=prefix[i-1]+arr[i];
  43. 	  }
  44. 	 for(int j=1;j<n;j++)
  45. 	  {  int i=0;
  46. 	  	int p = pow(10,digit(arr[j]));
  47. 	  	 	sum+=prefix[j-1]*p+arr[j]*(j-i) ;
  48.  
  49.  
  50. 	  }
  51. 	  cout<<sum;
  52.  
  53. 	return 0;
  54. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/qe6E2P
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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