代码实现

#include <iostream>
using namespace std;
int main()
{
	int n;
	cin >> n;
	int item;
	int data;
	int a[10005] = { 0 };
	for (int i = 0; i < n; i++)
	{
		cin >> a[i];
	}
	cin >> item >> data;
	int k = -1;
	for (int i = 0; i < n; i++)
	{
		if (a[i] == item)
		{
			k = i;
			n++;
		}
	}
	if (k == -1)
	{
		a[n] = data;
		n++;
	}
	else
	{
		for (int i = n; i >= k; i--)
		{
			a[i] = a[i - 1];
		}
		a[k] = data;
	}
	for (int i = 0; i < n-1; i++)
	{
		cout << a[i]<<" ";
	}
	cout << a[n-1] <<'\n';
	return 0;
}