CodeForces/A_Submission_Bait.cpp at master · Ash8389/CodeForces · GitHub

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

void solve()
{
    int n;
    cin >> n;

    vector<int> arr(n);

    unordered_map<int, int> mp;
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
        mp[arr[i]]++;
    }

    for (auto it : mp)
    {
        if (it.second % 2 != 0)
        {
            cout << "YES" << endl;
            return;
        }
    }

    cout << "NO" << endl;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int t;
    cin >> t;

    while (t--)
    {
        solve();
    }

    return 0;
}