题解

# include<iostream>
# include<cmath>
using namespace std;
void f(){
	int n,a[102]={0},t,sum=0;
	cin>>n;
	for(int i=0;i<n;++i){
		cin>>t;
		++a[abs(t)];
	}
	for(int i=1;i<=100;++i){
		if(a[i]==1) ++sum;
		else if(a[i]>1) sum+=2;
	}
	sum+=(a[0]!=0);
	cout<<sum<<endl;
}
int main(){
	int t;
	cin>>t;
	for(int i=0;i<t;++i) f();
	return 0;
}