Drinks Choosing Codeforces

Drinks Choosing Codeforces 1195A.cpp

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n, k;

    cin >> n >> k;

    int arr[k] = {0};

    int goods = 0, bads = 0;

    int inp;

    for (int i = 0; i < n; i++)
    {
        cin >> inp;
        arr[inp - 1]++;
    }

    for (int i = 0; i < k; i++)
    {
        goods = goods + arr[i] / 2;
        bads = bads + arr[i] % 2;
    }

    int total = goods * 2 + ceil((float)bads / 2);

    cout << total;

    return 0;
}