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  1. #include <bits/stdc++.h>
  2. #define VuDucNam ios_base::sync_with_stdio(false);
  3. #define Lop9a6 cin.tie(NULL);
  4. #define THCSPhamVanDong cout.tie(NULL);
  5. #define ll long long
  6. #define el cout << '\n'
  7. #define sz(a) (ll) a.size()
  8. #define all(a) a.begin(), a.end()
  9. #define fi first
  10. #define se second
  11. #define fill(a, x) memset(a, x, sizeof(a))
  12. #define file(name)                        \
  13.     if (fopen(name ".inp", "r"))          \
  14.         freopen(name ".inp", "r", stdin); \
  15.         freopen(name ".out", "w", stdout);
  16. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  17. #define RUNTIME cerr << "\nRuntime: " << TIME << "s.\n"
  18.  
  19. using namespace std;
  20.  
  21. const ll MOD = 1e9 + 7;
  22. const ll inf = LLONG_MAX;
  23.  
  24. int n;
  25. ll ans=1;
  26.  
  27. void solve()
  28. {
  29.     cin >> n;
  30.     for(int i=2;i<=sqrt(n);++i){
  31.         if(n%i==0){
  32.             if(i%2==0) ans*=i;
  33.             if(i!=n/i && n/i%2==0)
  34.                 ans*=(n/i);
  35.         }
  36.     }
  37.     if(ans==1){
  38.         if(n%2==0)
  39.             cout << n;
  40.         else cout << "0";
  41.     }else cout << ans;
  42.     el;
  43. }
  44.  
  45. int main()
  46. {
  47.     VuDucNam Lop9a6 THCSPhamVanDong
  48.     // file();
  49.     solve();
  50.     return 0;
  51. }
  52.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/FsSOXU
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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