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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int digits(int x){
  5. 	return to_string(x).length();
  6. }
  7.  
  8. const long long MOD = 998244353;
  9.  
  10. int main() {
  11. 	int n; cin >> n;
  12. 	vector<int> arr(n);
  13. 	for(int i = 0; i < n; i++)
  14. 	cin >> arr[i];
  15.  
  16. 	long long sum = 0;
  17. 	long long ans = 0;
  18. 	for(int i = 0; i < n; i++){
  19. 		sum += arr[i];
  20. 		int y = digits(arr[i]);
  21. 		ans = ans + sum*pow(10,y) + arr[i]*(i+1);
  22. 	}
  23. 	sum = arr[n-1];
  24. 	for(int i = n-2; i >= 0; i--){
  25. 		int y = digits(arr[i]);
  26. 		ans = ans + sum*pow(10,y) + arr[i]*(n-1-i);
  27. 		sum += arr[i];
  28. 	}
  29. 	cout << ans % MOD;
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/KTytoT
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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