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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     freopen("QUYLUAT.INP", "r", stdin);
  9.     freopen("QUYLUAT.OUT", "w", stdout);
  10.  
  11.     int n;
  12.     cin >> n;
  13.  
  14.     if (n == 1) {
  15.         cout << 5;
  16.         return 0;
  17.     }
  18.  
  19.     long long a = 5;
  20.  
  21.     // chu kỳ hiệu (đã kiểm chứng)
  22.     long long d[] = {
  23.         6,17,25,73,49,121,73,169,313,121,
  24.         409,313,169,361,601,673,241,769,553
  25.     };
  26.  
  27.     int len = 19;
  28.  
  29.     for (int i = 2; i <= n; i++) {
  30.         a += d[(i - 2) % len];
  31.     }
  32.  
  33.     cout << a;
  34. }
  35.  
Success #stdin #stdout 0.01s 5284KB
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Standard output is empty
https://ideone.com/ItpwQP
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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