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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     long long int t;
  6.     cin>>t;
  7.     while(t--)
  8.     {
  9.        long long int n,p[40009],i,two=0,z=0,sum;
  10.        cin>>n;
  11.        for(i=0;i<n;i++)
  12.        {
  13.            cin>>p[i];
  14.        }
  15.        for(i=0;i<n;i++)
  16.        {
  17.            if(p[i]==2)
  18.             two++;
  19.             if(p[i]==0)
  20.                 z++;
  21.        }
  22.        sum=(two*(two-1))/2 + (z*(z-1))/2;
  23.  
  24.     cout<<sum<<endl;
  25.  
  26.  
  27.     }
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0s 4280KB
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stdin
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2
3
2 4 2
3
0 2 3
stdout
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1
0
https://ideone.com/DLbsYC
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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