A

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)
#define ff     first
#define ss     second
#define pb     push_back
#define ppb    pop_back

int main()
{
    _test
    {
        int n;
        cin>>n;

        vector<int> a(n);
        for(auto &e: a)     cin>>e;

        map<int, int> cnt;
        for(auto e: a)
            cnt[e]++;

        int f = 1;

        if(*max_element(a.begin(), a.end()) > n)        f = 0;

        for(int i=1; i<=n; i++)
        {
            if(cnt[i] > cnt[i-1])
                f = 0;
        }

        if(f)       cout<<"YES\n";
        else        cout<<"NO\n";
    }
}