可以合并两个排序的数组,以便获得单个结果排序的数组。一个例子如下。
Array 1 = 1 3 7 9 10 Array 2 = 2 5 8 Merged array = 1 2 3 5 7 8 9 10
演示该程序的程序如下。
public class Example { public static void main (String[] args) { int[] arr1 = {11, 34, 66, 75}; int n1 = arr1.length; int[] arr2 = {1, 5, 19, 50, 89, 100}; int n2 = arr2.length; int[] merge = new int[n1 + n2]; int i = 0, j = 0, k = 0, x; System.out.print("Array 1: "); for (x = 0; x < n1; x++) System.out.print(arr1[x] + " "); System.out.print("\nArray 2: "); for (x = 0; x < n2; x++) System.out.print(arr2[x] + " "); while (i < n1 && j < n2) { if (arr1[i] < arr2[j]) merge[k++] = arr1[i++]; else merge[k++] = arr2[j++]; } while (i < n1) merge[k++] = arr1[i++]; while (j < n2) merge[k++] = arr2[j++]; System.out.print("\nArray after merging: "); for (x = 0; x < n1 + n2; x++) System.out.print(merge[x] + " "); } }
输出结果
Array 1: 11 34 66 75 Array 2: 1 5 19 50 89 100 Array after merging: 1 5 11 19 34 50 66 75 89 100
现在让我们了解上面的程序。
首先显示2个排序的数组arr1和arr2。演示此过程的代码段如下所示。
System.out.print("Array 1: "); for (x = 0; x < n1; x++) System.out.print(arr1[x] + " "); System.out.print("\nArray 2: "); for (x = 0; x < n2; x++) System.out.print(arr2[x] + " ");
使用while循环将排序后的数组合并为单个数组。在while循环之后,如果将任何元素保留在arr1或arr2中,则将它们添加到合并数组中。演示此过程的代码段如下所示。
while (i < n1 && j < n2) { if (arr1[i] < arr2[j]) merge[k++] = arr1[i++]; else merge[k++] = arr2[j++]; } while (i < n1) merge[k++] = arr1[i++]; while (j < n2) merge[k++] = arr2[j++];
最后,显示合并的数组。演示此过程的代码段如下所示。
System.out.print("\nArray after merging: "); for (x = 0; x < n1 + n2; x++) System.out.print(merge[x] + " ");