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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     long long n;
  8.     cin>>n;
  9.  
  10.   long long arr[n];
  11.  
  12.   for(long long i=0;i<n;i++)
  13.       cin>>arr[i];
  14.  
  15.   long long products[n];
  16.  
  17.     bool good=false;
  18.  
  19.   for(long long i=0;i<n;i++)
  20.         products[i]=arr[i]*arr[i+1];
  21.  
  22.     for(long long i=0;i<n;i++)
  23.         for(long long j=0;j<n;j++)
  24.           if(products[j]==arr[i])
  25.             {
  26.              good=true;
  27.               break;
  28.             }
  29.  
  30.   if(good)
  31.   cout<<"YES";
  32.   else
  33.   cout<<"NO";
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout 0.01s 5428KB
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stdin
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5
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stdout
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YES
https://ideone.com/dixXqZ
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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