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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. long long f(long long x)
  5. {
  6.     long long chia2 = x / 2;
  7.     long long chia3 = x / 3;
  8.     long long chia6 = x / 6;
  9.     return (chia2 + chia3 - chia6);
  10. }
  11. int main()
  12. {
  13.     freopen("CNTSEQ.inp", "r", stdin);
  14.     freopen("CNTSEQ.out", "w", stdout);
  15.  
  16.     long long a, b;
  17.     cin >> a >> b;
  18.     cout << f(b) - f(a - 1);
  19. }
  20.  
Success #stdin #stdout 0s 5316KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/EAINsI
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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