1656C_MakeEqualWithMod.cpp

//* 211323942	Jun/28/2023 16:37UTC+7	Minh4893IT	C - Make Equal With Mod	GNU C++17	Accepted	77 ms	800 KB

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ss stringstream
#define uset unordered_set
#define umap unordered_map
#define mmap multimap
#define mset multiset
#define pq priority_queue
#define endl "\n"

#define LLMAX INT64_MAX
#define GET(var) getline(cin, var)
#define EACH(x, a) for (auto &x : a)
#define IF(cond, t, f) (cond ? t : f)
#define OFILE(finp, fout) freopen(finp, "r", stdin), freopen(fout, "w", stdout)
#define FAST_IO ios_base::sync_with_stdio(false), cin.tie()

void solve()
{
    int n;
    cin >> n;
    vector<int> arr(n);

    for (int i = 0; i < n; ++i)
        cin >> arr[i];

    sort(arr.begin(), arr.end());

    if (binary_search(arr.begin(), arr.end(), 1))
    {
        for (int i = 1; i < n; ++i)
            if (arr[i] == arr[i - 1] + 1)
            {
                cout << "NO" << endl;
                return;
            }
    }

    cout << "YES" << endl;
}

signed main()
{
    FAST_IO;

    int t;
    cin >> t;

    while (t--)
        solve();

    return 0;
}