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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- int t;
- cin>>t;
- while(t--)
- {
- int a[20000],c,d=0,e=0,f=0,i,j,k,l;
- cin>>c;
- for(i=0;i<c;i++)
- {
- cin>>a[i];
- if(a[i]%3==0) d++;
- else if(a[i]%3==1) e++;
- else if(a[i]%3==2) f++;
- }
- k=min(e,f);
- d+=k;
- e-=k;
- f-=k;
- d+=(e/3);
- d+=(f/3);
- cout<<d<<endl;
- }
- return 0;
- }
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