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BTAR.cpp
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BTAR.cpp
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/*
Practise(EASY)
ALSO : https://www.codechef.com/COOK89/problems/BTAR
Editorial : https://discuss.codechef.com/questions/119997/btar-editorial
*/
#include <iostream>
#include<vector>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int main() {
// your code goes here
int t,n,m,i=0;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
int freq[4];
freq[0]=freq[1]=freq[2]=freq[3]=0;
int sum=0;
for(i=0;i<n;i++)
{
scanf("%d",&m);
freq[m%4]+=1;sum+=m;
}
if(sum%4!=0)
cout<< "-1\n";
else{
int step=0;
step+=(freq[2]/2);
freq[2]=freq[2]%2;
int k=min(freq[1],freq[3]);
step+=k;
freq[1]-=k;freq[3]-=k;
if(freq[2]!=0)
{
step+= freq[2]*2;
freq[1]==0 ? freq[3]-=(freq[2]*2) : freq[1]-=(freq[2]*2);
}
freq[1]>0 ? step+=(freq[1]/4)*3 :step+=(freq[3]/4)*3;
cout<< step<<"\n";
}//else
}//t
return 0;
}