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  1. import java.util.*;
  2.  
  3. class E_3Cycles {
  4. 	public static void main(String[] args) {
  5. 		Scanner s = new Scanner(System.in);
  6. 		int n = s.nextInt();
  7. 		System.out.println(n / 2 * (n - n / 2));
  8. 		for (int i = 1; i <= n / 2; ++i) {
  9. 			for (int j = n / 2 + 1; j <= n; ++j) {
  10. 				System.out.println(i + " " + j);
  11. 			}
  12. 		}
  13. 	}
  14. }
  15.  
Success #stdin #stdout 0.06s 213888KB
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https://ideone.com/ZWg0K
language:
Java (HotSpot 12)
created:
14 years ago
visibility:
secret

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