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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <algorithm>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	int t, n, a[100005], tmp;
  8. 	scanf("%d", &t);
  9. 	while(t--) {
  10. 		scanf("%d", &n);
  11. 		for(int i=0; i<n; i++) scanf("%d", &a[i]);
  12. 		sort(a, a+n);
  13. 		for(int i=1; i<n; i++) {
  14. 			if(i%2==0) {
  15. 				tmp=a[i];
  16. 				a[i]=a[i-1];
  17. 				a[i-1]=tmp;
  18. 			}
  19. 		}
  20. 		for(int i=0; i<n; i++) printf("%d ", a[i]);
  21. 		printf("\n");
  22. 	}
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 3612KB
comments (?)
stdin 
2
2
3 2
3
10 5 2
stdout 
2 3 
2 10 5
https://ideone.com/niVTWv
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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