CCF 201809-1 selling vegetables (score 100)

CCF 201809-1 selling vegetables

#include<iostream>

using namespace std;

int main()
{
	int n;
	cin >> n;
	int a[1000] = { 0 };
	int num;
	for (int i = 0; i < n; i++)
	{
		cin >> num;
		a[i] = num;
	}
	int b[1000] = { 0 };
	for (int i = 0; i < n; i++)
	{
		b[i] = a[i];
	}
	for (int i = 0; i < n; i++)
	{
		if (i == 0) a[i] = (b[i] + b[i + 1]) / 2;
		else {
			if (i == n - 1)
				a[i] = (b[i] + b[i - 1]) / 2;
			else
				a[i] = (b[i - 1] + b[i] + b[i + 1]) / 3;
		}
	}
	for (int i = 0; i < n; i++)
	{
		cout << a[i] << " ";
	}
	cout << endl;

	return 0;
}

Comparative basis