• 在线编程笔试练习2(京东)


    时间限制:1秒 空间限制:32768K 热度指数:9801

    题目描述

    给你两个集合,要求{A} + {B}。 注:同一个集合中不会有两个相同的元素。

    输入描述:

    每组输入数据分为三行,第一行有两个数字n,m(0 ≤ n,m ≤ 10000),分别表示集合A和集合B的元素个数。后两行分别表示集合A和集合B。每个元素为不超过int范围的整数,每个元素之间有个空格隔开。

    输出描述:

    针对每组数据输出一行数据,表示合并后的集合,要求从小到大输出,每个元素之间有一个空格隔开,行末无空格。
    示例1

    输入

    3 3
    1 3 5
    2 4 6
    

    输出

    1 2 3 4 5 6

    自己的low方法(没通过)
     1 import java.util.Scanner;
     2 
     3 /*
     4  * To change this license header, choose License Headers in Project Properties.
     5  * To change this template file, choose Tools | Templates
     6  * and open the template in the editor.
     7  */
     8 
     9 /**
    10  *
    11  * @author zhangtao
    12  */
    13 public class Test2 {
    14     public static void main(String[] args)
    15     {
    16         int m,n;
    17         int[] A;
    18         int[] B;
    19         Scanner scanner=new Scanner(System.in);
    20         m=scanner.nextInt();
    21         n=scanner.nextInt();
    22         A=new int[m];
    23         B=new int[n];
    24         //录入数据
    25         for(int i=0;i<m&&scanner.hasNext();i++)
    26         {
    27             A[i]=scanner.nextInt();
    28         }for(int j=0;j<m&&scanner.hasNext();j++)
    29         {
    30             B[j]=scanner.nextInt();
    31         }
    32         //按要求排序输出
    33         sortAandB(A,B);
    34     }
    35     static void sortAandB(int[] A,int[] B)
    36     {
    37         int totallong=A.length+B.length;
    38         int[]C=new int[totallong];
    39         //将A与B合并
    40         int i=0;
    41         while(i<A.length)
    42         {
    43             C[i]=A[i];
    44             i++;
    45         }
    46         while(i>=A.length&&i<totallong)
    47         {
    48             C[i]=B[i-A.length];
    49             i++;
    50         }
    51        quickSort(C,0,totallong-1) ;
    52        for(int j=0;j<totallong;j++) 
    53        {
    54            if(j!=totallong-1)
    55            {
    56                System.out.print(C[j]+" ");
    57            }
    58            else
    59            {
    60                 System.out.print(C[j]+"");
    61            }
    62        }
    63     }
    64     //快速排序
    65     static int partition(int a[], int low, int high) {
    66          int privotKey = a[low];                                 //基准元素  
    67          while (low < high) {                                    //从表的两端交替地向中间扫描  
    68              while (low < high && a[high] >= privotKey) //从high 所指位置向前搜索,至多到low+1 位置。将比基准元素小的交换到低端  
    69              {
    70                  --high;                                         //从右找比基准元小的
    71              }
    72              a[low] = a[high];                                    //如果比基准元素小,交换
    73              a[high] = privotKey;
    74  
    75              while (low < high && a[low] <= privotKey) {
    76                  ++low;                                          //从右找比基准元大的
    77              }
    78              a[high] = a[low];                                    //如果比基准元素,交换
    79              a[low] = privotKey;
    80  
    81          }
    82          return low;
    83      }
    84      static void quickSort(int a[], int low, int high) {
    85          if (low < high) {
    86              int privotLoc = partition(a, low, high);  //将表一分为二  
    87              quickSort(a, low, privotLoc - 1);          //递归对低子表递归排序  
    88              quickSort(a, privotLoc + 1, high);        //递归对高子表递归排序  
    89          }
    90      }
    91 }
    View Code

    大神方案一

     1 import java.util.Iterator;
     2 import java.util.Scanner;
     3 import java.util.Set;
     4 import java.util.TreeSet;
     5 //集合合并
     6 public class Test2 {
     7  
     8     public static void main(String[] args) {
     9         Scanner scan=new Scanner(System.in);
    10         Set<Integer>set=new TreeSet<Integer>();
    11         while(scan.hasNext()){
    12             String str1=scan.nextLine();
    13             String result1[]=str1.split(" ");
    14             int n=Integer.parseInt(result1[0]);
    15             int m=Integer.parseInt(result1[1]);
    16             String str2=scan.nextLine();
    17             String result2[]=str2.split(" ");
    18             for(int i=0;i<result2.length;i++){
    19                 set.add(Integer.parseInt(result2[i]));
    20             }
    21             String str3=scan.nextLine();
    22             String result3[]=str3.split(" ");
    23             for(int x=0;x<result3.length;x++){
    24                 set.add(Integer.parseInt(result3[x]));
    25             }
    26             Iterator<Integer>iter=set.iterator();
    27             StringBuffer sub=new StringBuffer();
    28             while(iter.hasNext()){
    29                 sub.append(iter.next()).append(" ");
    30             }
    31             sub.delete(sub.length()-1, sub.length());
    32             System.out.println(sub.toString());
    33         }
    34  
    35     }
    36  
    37 }
    View Code

     大神方案二

     1 import java.io.BufferedReader;
     2 import java.io.InputStreamReader;
     3 import java.util.Iterator;
     4 import java.util.Set;
     5 import java.util.TreeSet;
     6     
     7 public class Main {
     8     public static void main(String[] args) throws Exception {
     9         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    10         String line = null;
    11         while((line = br.readLine()) != null){
    12             String[] s = line.split(" ");
    13             int n = Integer.parseInt(s[0]);
    14             int m = Integer.parseInt(s[1]);
    15             Set<Integer> set = new TreeSet<Integer>();
    16             line = br.readLine();
    17             String[] s1 = line.split(" ");
    18             for(int i=0;i<n;i++){
    19                 set.add(Integer.parseInt(s1[i]));
    20             }
    21             line = br.readLine();
    22             String[] s2 = line.split(" ");
    23             for(int i=0;i<m;i++){
    24                 set.add(Integer.parseInt(s2[i]));
    25             }
    26             Iterator<Integer> it = set.iterator();
    27             StringBuffer sb = new StringBuffer();
    28             while(it.hasNext()){
    29                 sb.append(it.next());
    30                 sb.append(" ");
    31             }
    32             sb.delete(sb.length()-1, sb.length());
    33             System.out.println(sb.toString());
    34         }
    35     }
    36 }
    View Code
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  • 原文地址:https://www.cnblogs.com/JLZT1223/p/7449363.html
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