[백준] 15969번 행복 c++

#include <iostream>
#include <algorithm>

using namespace std;
int main(void) {
	ios::sync_with_stdio(NULL);
	cin.tie(NULL);
	cout.tie(NULL);
	int num;
	int* arr;
	cin >> num;
	arr = new int[num];
	for (int i = 0; i < num; i++) {
		cin >> arr[i];
	}
	sort(arr, arr + num);

	cout << arr[num - 1] - arr[0];
	delete[] arr;
}