问题描述:两个有序数组,一个长度为m,一个长度为n,需要将两个数组合并成一个数组
思路:
首先想到了二路归并,难点在于判断两路谁现被耗尽,未被耗尽的一个将会被依次添加数组
代码测试:
ps:这是第一次的想法,最真实的水平
import java.util.Scanner;
public class MergeSort {
public static void main(String[] args) {
Scanner p1 = new Scanner(System.in);
System.out.println("输入第一个数组,数组长度为m=:");
int m = p1.nextInt();
int[] a = new int[m];
for(int i = 0;i < m;++i){
System.out.println("输入第"+(i+1)+"个数:");
a[i] = p1.nextInt();
}
Scanner p2 = new Scanner(System.in);
System.out.println("输入第二个数组,数组长度为n=:");
int n = p2.nextInt();
int[] b= new int[n];
for(int j = 0;j < n;++j){
System.out.println("输入第"+(j+1)+"个数:");
b[j] = p2.nextInt();
}
int[] c = new int[a.length + b.length];
int t=0;
int f=0;
int k=0;
while(t<a.length&& f<b.length){
if(a[t]<b[f]){
c[k++]= c[t++];
}else{
c[k++]=b[f++];
}
}
while(t<m) {
c[k++]=a[t++];
}
while(f<n) {
c[k++]=b[f++];
}
for (int x:c) {
System.out.print(x+",\t");
}
}
}
-----------------------------------------------------------------------------------------
改进后的代码 利用方法,看起来更简洁了
public class MergeApp {
public static void merge(int[] arrayA,int sizeA,int[] arrayB,int sizeB,int[] arrayC){
int aDex = 0,bDex = 0,cDex = 0;
while (aDex < sizeA && bDex < sizeB){
if (arrayA[aDex] < arrayB[bDex]){
arrayC[cDex++] = arrayA[aDex++];
}else{
arrayC[cDex++] = arrayB[bDex++];
}
}
while (aDex < sizeA){
arrayC[cDex++] = arrayA[aDex++];
}
while (bDex < sizeB){
arrayC[cDex++] = arrayB[bDex++];
}
}
public static void display(int[] theArray,int size){
for (int i = 0; i < size; i++) {
System.out.print(theArray[i] + " ");
}
System.out.println("");
}
public static void main(String[] args) {
int[] arrayA = {23,47,81,95};
int[] arrayB = {7,14,39,59,62,74};
int[] arrayC = new int[10];
merge(arrayA, 4, arrayB, 6, arrayC);
display(arrayC,10);
}
}
---------------------------------------------------
代码升级
ps:更优雅了,有木有
public class MergeSortss {
public static void merge(int[] A,int m,int[] B,int n,int[] arrayC){
int i = 0,j = 0,k = 0;
while(k<(m+n)) {
if(j==n||(i<m&&A[i]<B[j])) {
arrayC[k++]=A[i++];
} else {
arrayC[k++]=B[j++];
}
}
}
public static void display(int[] theArray,int x){
for (int i = 0; i < x; i++) {
System.out.print(theArray[i] + " ");
}
System.out.println("");
}
public static void main(String[] args) {
int[] A = {14,23,95};
int[] B = {1,7,39,59,62,74};
int[] C = new int[10];
merge(A, 3, B, 6, C);
display(C,9);
}
}
来源:https://www.cnblogs.com/nulinulizainuli/p/10526939.html