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  1. #include <bits/stdc++.h>
  2.  
  3. #define ll long long
  4.  
  5. using namespace std;
  6.  
  7. ll n, a[22];
  8. int k;
  9.  
  10. int main()
  11. {
  12.     ios_base::sync_with_stdio(false);
  13.     cin.tie(NULL);
  14.     cout.tie(NULL);
  15.     cin >> k >> n;
  16.  
  17.     ll res = 0;
  18.     for(int i = 0; i < k; ++i) cin >> a[i];
  19.  
  20.     for(int mask = 1; mask < (1 << k); ++mask) {
  21.         int bits = 0;
  22.         vector<ll> v;
  23.         ll mult = 1;
  24.         for(int j = 0; j < k; ++j) {
  25.             if(mask & (1 << j)) {
  26.                 v.push_back(a[j]);
  27.                 ++bits;
  28.             }
  29.         }
  30.  
  31.         for(int j = 0; j < bits; ++j) {
  32.             if(mult > n / v[j]) {
  33.                 mult = n + 1;
  34.                 break;
  35.             }
  36.             mult *= v[j];
  37.         }
  38.  
  39.         ll c = n / mult;
  40.         if(bits & 1) {
  41.             res += c;
  42.         } else {
  43.             res -= c;
  44.         }
  45.     }
  46.  
  47.     cout << res;
  48.  
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/dKllM0
language:
C++14 (gcc 8.3)
created:
16 days ago
visibility:
public

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