#include <bits/stdc++.h>
using namespace std;
#define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int long long
#define rep(i,a,b) for(int i=a;i<b;++i)
 
void solve() {
    int n;
    cin>>n;
    vector<int> a(n);
    rep(i,0,n) cin>>a[i];
    sort(a.begin(), a.end());
    auto it = unique(a.begin(), a.end());
    int new_size = distance(a.begin(), it);
    cout << n - new_size << '\n';
}
 
int32_t main() {
    fast_io;
    int t;
    cin >> t;
    while (t--) solve();
    return 0;
}
 

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