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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define fi first
  5. #define se second
  6. #define MOD 1000000007
  7. #define FOR(i,a,b) for (int i = (a);i <= (b);i++)
  8. #define FOD(i,a,b) for (int i = (b);i >= (a);i--)
  9. #define ALL(x) (x).begin(),(x).end()
  10. #define ii pair<int,int>
  11. #define iii pair<int,pair<int,int>>
  12. //const int MOD = 998244353;
  13. const int MAXN = 1e6 + 7;
  14. int a[MAXN],f[MAXN];
  15. int main(){
  16.     ios_base::sync_with_stdio(0);
  17.     cin.tie(0); cout.tie(0);
  18.     //freopen("cardscore.inp","r",stdin);
  19.     //freopen("cardscore.out","w",stdout);
  20.     int n;cin >> n;
  21.     FOR(i,1,n)cin >> a[i];
  22.     FOR(i,1,n){
  23.         FOR(j,2,(int)sqrt(a[i]))if (a[i] % j == 0){
  24.             while(a[i] % j == 0)a[i] = a[i] / j;
  25.             f[j]++;
  26.         }
  27.         if (a[i] > 1)f[a[i]]++;
  28.     }
  29.     FOR(i,2,MAXN - 1)if (f[i] == n)
  30.     return cout << i,0;
  31.     cout << -1;
  32.     return 0^0;
  33. }
Success #stdin #stdout 0.01s 5784KB
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https://ideone.com/oeFIQx
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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