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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	int arr[n];
  8. 	for(int i = 0; i < n; i++){
  9. 		cin >> arr[i];
  10. 	}
  11. 	for(int i = 1; i < n; i+=2){
  12. 		int q = arr[i];
  13. 		arr[i] = arr[i-1];
  14. 		arr[i-1] = q;
  15. 	}
  16. 	for(int i = 0; i < n; i++){
  17. 		cout << arr[i] << " ";
  18. 	}
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 4392KB
comments (?)
stdin
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7
3 5 -7 7 5 -9 -4
stdout
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5 3 7 -7 -9 5 -4
https://ideone.com/tOFoA9
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language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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