Duplicate.cpp

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

int main()
{
    long long int n;
    cin >> n;
    long long int a[n];
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }

    sort(a, a + n);

    bool flag = false;
    for (int i = 0; i < n; i++)
    {
        int l = i + 1, r = n - 1;
        while (l <= r)
        {
            int mid = (l + r) / 2;
            if (a[mid] == a[i])
            {
                flag = true;
                break;
            }
            else if (a[i] > a[mid])
            {
                l = mid + 1;
            }
            else
            {
                r = mid - 1;
            }
        }
    }

    if (flag)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;

    return 0;
}