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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <string>
  4. #include <vector>
  5. #include <bitset>
  6. #include <stdio.h>
  7. #include <math.h>
  8. using namespace std;
  9. typedef std::vector<int> vi;
  10. typedef std::vector<pair<int, int> > vii;
  11. //----------Main source code -----------------//
  12. int n, ring[17];
  13. bitset<32> prime;
  14. bitset<17> state;
  15.  
  16. void rcr(int i){
  17. 	if(i==n-1){
  18. 		if(prime[1+ring[i-1]]){
  19. 			cout<<ring[0];
  20. 			for(int j=1;j<n-1;j++)
  21. 				cout<<" "<<ring[j];
  22. 			cout<<endl;
  23. 		}
  24. 	}
  25. 	for(int j=2;j<n;j++)
  26. 		if(state[j]&&prime[ring[i-1]+j]){
  27. 			ring[i]=j;
  28. 			state.reset(j);
  29. 			rcr(i+1);
  30. 			state.set(j);
  31. 		}
  32. }
  33. int main() {
  34. 	//-prime sieve-------
  35. 	prime.set();
  36. 	for(int i=2;i<32;i++)
  37. 		if(prime[i])
  38. 			for(int j=2*i;j<32;j+=i)
  39. 				prime.reset(j);
  40.  
  41. 	int ca =1;
  42. 	while(cin.good()&&cin>>n){
  43. 		n++;
  44. 		state.set();
  45. 		ring[0]=1;
  46. 		if(ca!=1) cout<<endl;
  47. 		printf("Case %d:\n", ca++);
  48. 		rcr(1);
  49. 	}
  50. 	return 0;
  51. }
Success #stdin #stdout 0s 3300KB
comments (?)
stdin 
6
8
stdout 
Case 1:
1 4 3 2 5 6
1 6 5 2 3 4

Case 2:
1 2 3 8 5 6 7 4
1 2 5 8 3 4 7 6
1 4 7 6 5 8 3 2
1 6 7 4 3 8 5 2
https://ideone.com/uylcK8
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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