#include<bits/stdc++.h>
using namespace std;
int a[1010],n,x,y,i,p;
int main()
{
	cin >> n >> x >> y;
	for(i = 1; i <= n; i++){
		cin >> a[i];
		if(a[i] == x) p = i;
	}
	for(i = n; i > p; i--){
		a[i+1] = a[i];
	}
	a[p+1] = y;
	n++;
	for(i = 1; i <= n; i++) cout << a[i] << " ";
	return 0;
}

最简代码