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a guest Apr 25th, 2019 70 Never
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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.     int cnt2,cnt5,cnt10,n,i,ans;
  7.     cnt2 = 0;
  8.     cnt5 = 0;
  9.     cnt10 = 0;
  10.     ans = 0;
  11.    
  12.     cin >> n;
  13.     int a[n];
  14.     for (i = 0; i < n; i++)
  15.         cin >> a[i];
  16.    
  17.     for (i = 10; i < n; i++){
  18.         cin >> a[i];
  19.         if (a[i-10] % 2 == 0)
  20.             cnt2++;
  21.         if (a[i-10] % 5 == 0)
  22.             cnt5++;
  23.         if (a[i-10] % 10 == 0)
  24.             cnt10++;
  25.        
  26.         if (a[i] % 10 == 0)
  27.             ans += i-9;
  28.         if (a[i] % 2 == 0 && a[i] % 5 != 0)
  29.             ans += cnt5;
  30.         if (a[i] % 5 == 0 && a[i] % 2 != 0)
  31.             ans += cnt2;
  32.         if (a[i] % 2 != 0 && a[i] % 5 != 0)
  33.             ans+= cnt10;
  34.     }
  35.    
  36.     cout << ans << endl;
  37.     return 0;
  38. }
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