Missing number

 1 #include<iostream>
 2 #include<cstring>
 3 using namespace std;
 4 const int maxn=1000;
 5 int a[maxn];
 6 int main()
 7 {
 8 int T,n,x,j;
 9 int b[5];
10 cin>>T;
11 while(T--)
12 {
13     memset(a,0,sizeof(a));
14  cin>>n;
15 for(int i=0;i<n;i++)
16 {cin>>x;
17 a[x]=1;
18 }
19 j=0;
20 for(int k=1;k<=n+2;k++)
21 if(!a[k])
22 b[j++]=k;
23 cout<<b[0]<<‘ ‘<<b[1]<<endl;
24 }
25 return 0;
26 }