设计并实现对n(输入参数)个随机产生的整数进行归并排序的程序javay
时间: 2023-05-30 17:05:32 浏览: 60
import java.util.Arrays;
public class MergeSort {
public static void main(String[] args) {
int n = 10;
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = (int) (Math.random() * 100);
}
System.out.println("Before sorting: " + Arrays.toString(arr));
mergeSort(arr, 0, n-1);
System.out.println("After sorting: " + Arrays.toString(arr));
}
public static void mergeSort(int[] arr, int left, int right) {
if (left < right) {
int mid = (left + right) / 2;
mergeSort(arr, left, mid);
mergeSort(arr, mid+1, right);
merge(arr, left, mid, right);
}
}
public static void merge(int[] arr, int left, int mid, int right) {
int[] temp = new int[right-left+1];
int i = left;
int j = mid+1;
int k = 0;
while (i <= mid && j <= right) {
if (arr[i] <= arr[j]) {
temp[k++] = arr[i++];
} else {
temp[k++] = arr[j++];
}
}
while (i <= mid) {
temp[k++] = arr[i++];
}
while (j <= right) {
temp[k++] = arr[j++];
}
for (int m = 0; m < temp.length; m++) {
arr[left+m] = temp[m];
}
}
}
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