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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   int n, m;
  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.         int r = i * 4;
  15.         if (!a[r + 1] && !a[r + 2]) {
  16.             cout << r + 1 << " " << r + 2 << endl;
  17.             return 0;
  18.         }
  19.         if (!a[r + 3] && !a[r + 4]) {
  20.             cout << r + 3 << " " << r + 4 << endl;
  21.             return 0;
  22.         }
  23.         if (!a[r + 2] && !a[r + 4]) {
  24.             cout << r + 2 << " " << r + 4 << endl;
  25.             return 0;
  26.         }
  27.     }
  28.     int count = 0;
  29.     for (int i = 1; i <= n * 4; i++) {
  30.         if (!a[i]) {
  31.             cout << i << " ";
  32.             count++;
  33.             if (count == 2) break;
  34.         }
  35.     }
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5296KB
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stdin
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2 3
3 7 8
stdout
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5 6
https://ideone.com/10FX9I
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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