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  1. #include <cmath>
  2. #include <iomanip>
  3. #include <iostream>
  4. #include <algorithm>
  5.  
  6. using namespace std;
  7.  
  8. typedef long long ll;
  9.  
  10. void init(ll x, vector<int> &A){
  11. 	int curIndex = 0;
  12. 	int curPower = 1;
  13. 	while(true){
  14. 		A[curIndex] = x % 3;
  15. 		x = (x-A[curIndex])/3;
  16. 		if (x == 0) break;
  17. 		curIndex++;
  18. 	}
  19. }
  20.  
  21. int main(int argc, char const *argv[])
  22. {
  23. 	vector<int> A(21, 0);
  24. 	vector<int> B(21, 0);
  25. 	int n;
  26. 	ll x;
  27. 	cin >> n >> x;
  28. 	//check feasibility
  29. 	if (x > static_cast<ll>((pow(3, n)-1)/2)) {
  30. 		cout << -1 << endl;
  31. 		return 0;
  32. 	}
  33. 	//initialize value of A with digits of x in base-3 representation
  34. 	init(x, A);
  35. 	for(int i = 0; i < 21; i++){
  36. 		if (A[i] == 0){
  37. 			//nothing
  38. 			continue;
  39. 		}
  40. 		if (A[i] == 1){
  41. 			A[i] = 0;
  42. 			B[i] = 1;
  43. 			continue;
  44. 		}
  45. 		if (A[i] == 2){
  46. 			A[i] = 1;
  47. 			A[i+1]++;
  48. 			continue;
  49. 		}
  50. 		if (A[i] == 3){
  51. 			A[i+1]++;
  52. 			continue;
  53. 		}
  54. 	}
  55. 	int i;
  56. 	i = 1;
  57. 	for(auto it: A){
  58. 		if (it == 1) cout << i << " ";
  59. 		i++;
  60. 	}
  61. 	cout << endl;
  62. 	i = 1;
  63. 	for(auto it: B){
  64. 		if (it == 1) cout << i << " ";
  65. 		i++;
  66. 	}
  67. 	cout << endl;
  68. 	return 0;
  69. }
  70.  
Success #stdin #stdout 0s 3464KB
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https://ideone.com/tbB7Ve
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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