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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. int main(){
  6. 	int l = 5;
  7. 	int n = (1 << l);
  8. 	cout << l << "\n";
  9. 	for(int i = 1; i < n-1; i += 2){
  10. 		cout << i << " " << i + 1 << "\n";
  11. 	}
  12. 	cout << n - 1 << " " << 0 << "\n";
  13. 	return 0;
  14. }
Success #stdin #stdout 0.01s 5276KB
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stdin
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Standard input is empty
stdout
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5
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 0
https://ideone.com/cob0Lg
language:
C++14 (gcc 8.3)
created:
20 hours ago
visibility:
public

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