[C++] Most Frequent Number

#include <iostream>
#include <array>
#include <vector>
#include <algorithm>
using namespace std;



int main()
{
	const int arrSize = 20;
	int inputNumber = 0;
	cin >> inputNumber;
	array <int, arrSize> arr1;

	for (int i = 0; i < inputNumber; i++) {
		cin >> arr1[i];
	}
	int countNumbers = 0;
	int mostFrequentNumber = 0;
	vector <int> resultContainer;
	for (int y = 0; y < inputNumber; y++) {
		for (int z = y+1; z < inputNumber; z++) {
			if (arr1[y] == arr1[z]) {
				countNumbers++;
			}

		}
		if (countNumbers >= mostFrequentNumber) {
			mostFrequentNumber = countNumbers;
			resultContainer.push_back(arr1[y]);
		}
		countNumbers = 0;
	}
	sort(resultContainer.begin(), resultContainer.end());
	for (int k : resultContainer) {
		cout << k << " ";
	}
	return 0;
}