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  1. // MergeSort
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. void Merge(int *a,int *x,int *y,int s,int e){
  6. 	int i=s;
  7. 	int mid = (s+e)/2;
  8. 	int j=mid+1;
  9. 	int k=s;
  10. 	while(i<=mid && j<=e){
  11. 		if(x[i]<y[j]){
  12. 			a[k++]=x[i++];
  13. 		}
  14. 		else{
  15. 			a[k++]=y[j++];
  16. 		}
  17. 	}
  18. 	while(i<=mid){
  19. 		a[k++]=x[i++];
  20. 	}
  21. 	while(j<=e){
  22. 		a[k++]=y[j++];
  23. 	}
  24. }
  25.  
  26. void MergeSort(int *a,int s,int e){
  27. 	if(s>=e){
  28. 		return;
  29. 	}
  30. 	// Divide
  31. 	int x[100],y[100];
  32. 	int mid = (s+e)/2;
  33. 	for(int i=s;i<=mid;i++){
  34. 		x[i]=a[i];
  35. 	}
  36.  
  37. 	for(int i=mid+1;i<=e;i++){
  38. 		y[i]=a[i];
  39. 	}
  40. 	// Sort
  41. 	MergeSort(x,s,mid);
  42. 	MergeSort(y,mid+1,e);
  43. 	// Merge
  44. 	Merge(a,x,y,s,e);
  45. }
  46.  
  47. int main(){
  48. 	int a[]={6,5,4,3,2,1};
  49. 	int n=sizeof(a)/sizeof(int);
  50.  
  51. 	for(int i=0;i<n;i++){
  52. 		cout<<a[i]<<" ";
  53. 	}
  54. 	cout<<endl;
  55. 	MergeSort(a,0,n-1);
  56. 	for(int i=0;i<n;i++){
  57. 		cout<<a[i]<<" ";
  58. 	}
  59. 	cout<<endl;
  60.  
  61. 	return 0;
  62. }
Success #stdin #stdout 0s 4388KB
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stdin
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Standard input is empty
stdout
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6 5 4 3 2 1 
1 2 3 4 5 6
https://ideone.com/DMvcpM
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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