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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1e9+7;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27. // 3
  28. // 3 14 15
  29.  
  30.  
  31.  
  32. const int MOD = 998244353;
  33.  
  34. vector<int> a;
  35.  
  36. int consistency(int n){
  37.  
  38. 	vector<int> prefix(n+1);
  39. 	for(int i=0; i<n; i++){
  40. 		prefix[i+1] = (prefix[i] + a[i])%MOD;
  41. 	}
  42.  
  43. 	int ans = 0;
  44. 	for(int i=n-1; i>=0; i--){
  45.  
  46. 		int x = a[i];
  47. 		int psum = prefix[i];
  48.  
  49. 		//* psum = psum * 10^digits
  50. 		while(x>0){
  51. 			psum = (psum * 10)%MOD;
  52. 			x /= 10;
  53. 		}
  54.  
  55. 		psum = (psum + (i*a[i])%MOD )%MOD;
  56.  
  57. 		ans = (ans + psum)%MOD;
  58. 	}
  59.  
  60. 	return ans;
  61. }
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77. int practice(int n){
  78.  
  79.  
  80.     return 0;
  81. }
  82.  
  83.  
  84.  
  85.  
  86.  
  87. void solve() {
  88.  
  89.     int n;
  90.     cin>> n;
  91.  
  92.     a.resize(n);
  93.     for(int i=0; i<n; i++) cin >> a[i];
  94.  
  95.     cout << consistency(n) << endl;
  96.  
  97.  
  98. }
  99.  
  100.  
  101.  
  102.  
  103.  
  104. int32_t main() {
  105.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  106.  
  107.     int t = 1;
  108.     // cin >> t;
  109.     while (t--) {
  110.         solve();
  111.     }
  112.  
  113.     return 0;
  114. }
Success #stdin #stdout 0s 5300KB
comments (?)
stdin
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3
3 14 15
stdout
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2044
https://ideone.com/CkIsyS
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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