#include<bits/stdc++.h>
using namespace std;
#define AIN(a,n,b) assert(a<=n && n<=b)
#define i64 long long
#define MAX 100000
#define pb push_back
#define all(a) a.begin(),a.end()

typedef pair<int,int> pii;

bool a[MAX+5];

int main(){
    double cl = clock();
    int t,i,ans,x,n;
    scanf("%d",&t);
    AIN(1,t,20);
    while(t--){
        scanf("%d",&n);
        AIN(1,n,MAX);
        ans = 0;
        memset(a,0,sizeof(a));
        for(i = 0;i<n;i++){
            scanf("%d",&x);
            AIN(1,x,MAX);
            if(a[x]) continue;
            ans++;
            a[x] = 1;
        }
        printf("%d\n",ans);
    }
    cl = clock() - cl;
    fprintf(stderr,"Execution Time = %lf sec\n",cl / CLOCKS_PER_SEC);
    return 0;
}