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  1. /*
  2.     PROG: ride
  3.     LANG : C++
  4. */
  5.  
  6. #include<stdio.h>
  7. //#include<stdlib.h>
  8. //#include<iostream>
  9. #include<string.h>
  10. //#include<conio.h>
  11. #include<math.h>
  12. //#include<algorithm>
  13. //#define int char
  14. //#define clrscr() 100
  15. //#define INFINITY 99999
  16.  
  17.  
  18.  
  19. //using namespace std;
  20. //#define FOR(i,a,b) for(int i=a;i<b;i++)
  21.  
  22.  
  23.  
  24.  
  25.  
  26.  
  27.  
  28.  
  29.  long int gcd( long int a1, long int b1)
  30. {
  31.     /*unsigned long long int t1;
  32.     while(b1!=0)
  33.     {
  34.         t1 = b1;
  35.         b1 = a1%b1; 
  36.         a1 = t1;
  37.     } 
  38.     
  39.     return a1;*/
  40.      if (!b1) return a1;
  41.     return gcd(b1,a1%b1);
  42. }
  43.  
  44.  
  45. int main()
  46. {
  47.    long int t,n,a[100002],i;
  48.     long int temp;
  49.     //cin>>t;
  50.     scanf("%ld",&t);
  51.     while(t--)
  52.     {
  53.         //cin>>n;
  54.         scanf("%ld",&n);
  55.         //cin>>a[0];
  56.         scanf("%ld",&a[0]);
  57.         temp=a[0];
  58.         //FOR(i,1,n)
  59.         for( i=1;i<n;i++)
  60.         {
  61.             //cin>>a[i];
  62.             scanf("%ld",&a[i]);
  63.             temp=gcd(temp,a[i]);
  64.         }
  65.         //cout<<temp<<"\n";
  66.         if(temp>1)
  67.        {
  68.  
  69.             //FOR(i,2,temp)
  70.             for( i=2;i<=temp/2;i++)
  71.             {
  72.                 if(temp%i==0)
  73.                 {
  74.                     //temp=i;
  75.                     break;
  76.                 }
  77.             }
  78.            // cout<<temp<<"\n";    
  79.            printf("%ld\n",i);
  80.         }
  81.         else //cout<<"-1\n";
  82.         printf("-1\n");
  83.  
  84.     }
  85.     return 0;
  86. }  
  87.  
Success #stdin #stdout 0.01s 2996KB
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https://ideone.com/FL8QVb
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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