Added java implementation of merge sort (#23993)

* Added java implementation of merge sort

* fix: changed to two space indentation
This commit is contained in:
mridul981
2019-03-24 21:33:48 +05:30
committed by The Coding Aviator
parent cb2241acd6
commit 1827f993d2

View File

@ -306,3 +306,54 @@ public class mergesort {
} }
``` ```
### Example in Java
```java
public class mergesort {
public static int[] mergesort(int[] arr, int lo, int hi) {
if (lo == hi) {
int[] ba = new int[1];
ba[0] = arr[lo];
return ba;
}
int mid = (lo + hi) / 2;
int arr1[] = mergesort(arr, lo, mid);
int arr2[] = mergesort(arr, mid + 1, hi);
return merge(arr1, arr2);
}
public static int[] merge(int[] arr1, int[] arr2) {
int i = 0, j = 0, k = 0;
int n = arr1.length;
int m = arr2.length;
int[] arr3 = new int[m + n];
while (i < n && j < m) {
if (arr1[i] < arr2[j]) {
arr3[k] = arr1[i];
i++;
} else {
arr3[k] = arr2[j];
j++;
}
k++;
}
while (i < n) {
arr3[k] = arr1[i];
i++;
k++;
}
while (j < m) {
arr3[k] = arr2[j];
j++;
k++;
}
return arr3;
}
public static void main(String[] args) {
int arr[] = {2, 9, 8, 3, 6, 4, 10, 7};
int[] so = mergesort(arr, 0, arr.length - 1);
for (int i = 0; i < arr.length; i++)
System.out.print(so[i] + " ");
}
}
```