Submission #62514218

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#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=1e3+10,M=1e5+10;
int n,m,a[N];
signed main()
{
  cin>>n>>m;
  for(int i=1;i<=m;i++)
  {
    int b;
    cin>>b;
    a[b]=1;
  }
  cout<<n-m<<endl;
  for(int i=1;i<=n;i++)
  {
    if(a[i]==0)
    {
      cout<<i<<" ";
    }
 
 
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#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=1e3+10,M=1e5+10;
int n,m,a[N];
signed main()
{
	cin>>n>>m;
	for(int i=1;i<=m;i++)
	{
		int b;
		cin>>b;
		a[b]=1;
	}
	cout<<n-m<<endl;
	for(int i=1;i<=n;i++)
	{
		if(a[i]==0)
		{
			cout<<i<<" ";
		}
	}
	return 0;
}
 

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