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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. int main() {
  6.  
  7. 	int N;
  8. 	cin>>N;
  9.  
  10. 	if(N ==1)
  11. 	{
  12. 		cout<<1<<endl;
  13. 		return 0;
  14. 	}
  15.  
  16. 	if(N <= 3)
  17. 	{
  18. 		cout<<"NO SOLUTION"<<endl;
  19. 		return 0;
  20. 	}
  21.  
  22. 	if(N==4)
  23. 	{
  24. 		cout<<"2 4 1 3"<<endl;
  25. 		return 0;
  26. 	}
  27.  
  28. 	int i=1;
  29. 	int j=N;
  30.  
  31. 	vector<int> V;
  32.  
  33. 	while(i < j)
  34. 	{
  35. 		V.push_back(j);
  36. 		V.push_back(i);
  37. 		j--;
  38. 		i++;
  39. 	}
  40. 	if(i == j)
  41. 	{
  42. 		V.push_back(i);
  43. 	}
  44.  
  45. 	for(int i=0;i<V.size()-1;i++)
  46. 	{
  47. 		if(abs(V[i+1]-V[i]) == 1)
  48. 		{
  49. 			int temp =V[i+1];
  50. 			V[i+1] = V[0];
  51. 			V[0] = temp;
  52. 		}
  53. 	}
  54.  
  55. 	for(int i=0;i<V.size();i++)
  56. 	{
  57. 		if(i != V.size()-1)
  58. 		{
  59. 			cout<<V[i]<<" ";
  60. 		}
  61. 		else
  62. 		{
  63. 			cout<<V[i]<<endl;
  64. 		}
  65. 	}
  66.  
  67.  
  68. 	return 0;
  69. }
Success #stdin #stdout 0.01s 5276KB
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https://ideone.com/AQIwhJ
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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