View Code of Problem 3857

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		int a,b,sum=0;
		cin>>a;
		vector <int> op;
		for(int j=0;j<a;j++){
			cin>>b;
			op.push_back(b);
		}
		sort(op.begin(),op.end());
		for(int j=0;j<a;j++){
			if(op[j]==2) sum++;
			if(op[j]>2) break;
		}
		cout<<sum<<endl;
	}
}