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  1. # include <bits/stdc++.h>
  2. using namespace std;
  3. # define fi cin
  4. # define fo cout
  5. # define x first
  6. # define y second
  7. # define ll long long
  8. # define db long double
  9. # define scn(x) scanf("%I64d",&x)
  10. # define scan(x) scanf("%d",&x)
  11. # define print(x) printf("%d ",x)
  12. # define prnt(x) printf("%I64d ",x);
  13. # define eol printf("\n")
  14. # define IOS ios_base :: sync_with_stdio(0)
  15. int s[1 << 20];
  16. int main(void)
  17. {
  18.     int t;
  19.     scan(t);
  20.     while (t --)
  21.     {
  22.         int n;
  23.         scan(n);
  24.         int mn = 1e9;
  25.         for (int i = 1;i <= n;++i) scan(s[i]),mn = min(mn,s[i]);
  26.         int ans = 0;
  27.         vector < int > can;
  28.         for (int i = 1;i * i <= mn;++i)
  29.             if (!(mn % i))
  30.             {
  31.                 can.push_back(i);
  32.                 if (1ll * i * i != mn) can.push_back(mn / i);
  33.             }
  34.         for (auto P : can)
  35.         {
  36.             int G = 0;
  37.             for (int i = 1;i <= n;++i)
  38.                 if (s[i] % P) G = __gcd(G,s[i]);
  39.             if (!G) G = 1e9;
  40.             ans = max(ans,min(G,P));
  41.         }
  42.         print(ans);eol;
  43.     }
  44.     return 0;
  45. }
  46.  
  47.  
Runtime error #stdin #stdout 0.45s 7552KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/fGYc7z
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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