merge sort java
package Arrays;
import java.util.Arrays;
public class MergeSort {
static void sort(int[] arr) {
if (arr.length < 2) return;
int mid = arr.length / 2;
int[] left_half = new int[mid];
int[] right_half = new int[arr.length - mid];
// copying the elements of array into left_half
for (int i = 0; i < mid; i++) {
left_half[i] = arr[i];
}
// copying the elements of array into right_half
for (int i = mid; i < arr.length; i++) {
right_half[i - mid] = arr[i];
}
sort(left_half);
sort(right_half);
merge(arr, left_half, right_half);
}
static void merge(int[] arr, int[] left_half, int[] right_half) {
int i = 0, j = 0, k = 0;
while (i < left_half.length && j < right_half.length) {
if (left_half[i] < right_half[j]) {
arr[k++] = left_half[i++];
}
else {
arr[k++] = right_half[j++];
}
}
while (i < left_half.length) {
arr[k++] = left_half[i++];
}
while (j < right_half.length) {
arr[k++] = right_half[j++];
}
}
public static void main(String[] args) {
int[] arr = {5, 1, 7, 3, 8, 0, 1, 5, 7, 2, 8, 9, -7, 4, -9, -3, 4};
sort(arr);
System.out.println(Arrays.toString(arr));
}
}