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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   int n, m , k=0;
  6.   cin>>n>>m;
  7.   int a[n*4+1]={0,};
  8.   for(int i=0; i<m; i++){
  9.   	int x;
  10.   	cin>>x;
  11.   	a[x]=1;
  12.   }
  13.   for (int i = 1; i<=4*n; i+=2) {
  14.        if(a[i]==0 and a[i+1]==0)
  15.        cout<<i<<" "<<i+1<<endl;
  16.     return 0;
  17.   }
  18.   for (int i=2 ; i<= 4*n; i+=4){
  19.   	if(a[i]==0 and a[i+1]==0)
  20.        cout<<i<<" "<<i+1<<endl;
  21.     return 0;
  22.   }
  23.    for (int i=1 ; i<= 4*n; i+=4){
  24.   	if(a[i]==0 and a[i+1]==0)
  25.        cout<<i<<" "<<i+1<<endl;
  26.     return 0;
  27.   }
  28.   for(int i=1; i<=4*n; i++){
  29.   	if(a[i]==0){
  30.   		cout<<i<<" ";
  31.   		k++;
  32.   	}
  33.   }
  34.   if(k==2) return 0;
  35. }
  36.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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2 5
1 4 5 2 7
stdout
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Standard output is empty
https://ideone.com/u5PWR4
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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