Create a method that with 2 given arrays returns a new one with elements from a and b with no duplicates:

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英文:

Create a method that with 2 given arrays returns a new one with elements from a and b with no duplicates:

问题

public static int[] arrayUnion(int[] a, int[] b) {
    int[] result;

    for (int i = 0; i < a.length; i++) {
        for (int k = 0; k < result.length; k++) {
            if (a[i] != result[k]) {
                result.add(a[i]);
            }
        }
    }

    for (int j = 0; j < b.length; j++) {
        for (int k = 0; k < result.length; k++) {
            if (b[j] != result[k]) {
                result.add(b[j]);
            }
        }
    }
    return result;
}
英文:

Hey everyone I am a beginner and I am trying to do this problem, here is what I have tried so far...I am really stumped though:

Write a method called int[] arrayUnion(int[] a, int[] b) that, given two int arrays, returns a new array with unique elements from a and b. No duplicates!

Example Outputs:
arrayUnion([1, 2, 3], [-1, 0, 1]) returns [1, 2, 3, -1, 0]

arrayUnion([1, 1, 1], [1, 1, 1]) returns 1

   public static int[] arrayUnion(int[] a, int[] b){
        int[] result;

        for(int i =0; i&lt; a.length; i++){
            for(int k =0; k&lt;result.length; k++){
                if(a[i]!= result[k]){
                    result.add(a[i]);
                }
            }
        }


         for(int j =0; j&lt; b.length; j++){
            for(int k =0; k&lt;result.length; k++){
                if(b[j]!=result[k]){
                  result.add(b[j]);
                }
            }
        }
        return result;
    }

答案1

得分: 2

你可以使用流来实现,将两个数组合并,只保留唯一值,形成一个单一的数组。

int[] a = { 1, 2, 3, 2, 7, 4, 5 };
int[] b = { 2, 9, 4, 5, 5 };

int[] union = arrayUnion(a, b);
System.out.println(Arrays.toString(union));

输出结果为:

[1, 2, 3, 4, 5, 7, 9]

这个方法的原理是:

  • 将两个数组转换成 IntStream 流。
  • 去除重复值。
  • 再将流转换回 int 数组。
static int[] arrayUnion(int[] a, int[] b) {
  return Stream.of(a, b).flatMapToInt(IntStream::of)
       .distinct()
       .toArray();
}
英文:

You can do it with a stream, merging the two arrays keeping only the distinct values single array.

int[] a = { 1, 2, 3, 2, 7, 4, 5 };
int[] b = { 2, 9, 4, 5, 5 };

int[] union = arrayUnion(a,b);
System.out.println(Arrays.toString(union));
 

prints

[1, 2, 3, 4, 5, 7, 9]	

This works by

  • flattening the two arrays into an Intstream.
  • getting rid of duplicates
  • and converting back to an int array.
static int[] arrayUnion(int[] a, int[] b) {
  return Stream.of(a,b).flatMapToInt(IntStream::of)
	 .distinct()
	 .toArray();
}


</details>



# 答案2
**得分**: 0

首先,您不能对数组使用`add`方法。因此,您的代码可能如下所示:

```java
public int[] arrayUnion(int[] a, int[] b) {
    List<Integer> result = new ArrayList<>();

    for (int value: a) {
        if (!result.contains(value)) {
            result.add(value);
        }
    }

    for (int value: b) {
        if (!result.contains(value)) {
            result.add(value);
        }
    }

    return result.stream().mapToInt(Integer::intValue).toArray();
}

其次,使用集合会更加简便。因此,您可以轻松地添加所有值并返回数组:

public int[] arrayUnion(int[] a, int[] b) {
    Set<Integer> result = new HashSet<>();

    for (int value: a) {
        result.add(value);
    }

    for (int value: b) {
        result.add(value);
    }

    return result.stream().mapToInt(Integer::intValue).toArray();
}

还有第三个选项。您可以使用Java Stream API与flatMap方法:

public int[] arrayUnion(int[] a, int[] b) {
    return Stream.of(a, b).flatMapToInt(IntStream::of).distinct().toArray();
}
英文:

First you can not use the add method for an array. So therefore your code could look like this:

public int[] arrayUnion(int[] a, int[] b) {
    List&lt;Integer&gt; result = new ArrayList&lt;&gt;();

    for (int value: a) {
        if (!result.contains(value)) {
            result.add(value);
        }
    }

    for (int value: b) {
        if (!result.contains(value)) {
            result.add(value);
        }
    }

    return result.stream().mapToInt(Integer::intValue).toArray();
}

Second it is a little bit easier with a set. Therefore you can easily add all values and return the array:

public int[] arrayUnion(int[] a, int[] b) {
    Set&lt;Integer&gt; result = new HashSet&lt;&gt;();

    for (int value: a) {
        result.add(value);
    }

    for (int value: b) {
        result.add(value);
    }

    return result.stream().mapToInt(Integer::intValue).toArray();
}

And there is also a third option. You can use the Java Stream API with the flatMap:

public int[] arrayUnion(int[] a, int[] b) {
    return Stream.of(a, b).flatMapToInt(IntStream::of).distinct().toArray();
}

答案3

得分: 0

如果您可以使用Java集合框架,可以按照以下方式使用Set来获取唯一的整数数组:

public static int[] arrayUnion(int[] a, int[] b){

        HashSet<Integer> set = new HashSet();

        for(int i = 0; i < a.length; i++){
            set.add(a[i]);  
        }

        for(int i = 0; i < b.length; i++){
            set.add(b[i]);  
        }

        int n = set.size(); 
        int[] result = new int[n]; 
  
        int j = 0;
        for(Integer i : set) {
            result[j++] = i;
        }

        return result;
}
英文:

If you can use the Java Collections, you can use Set as follows to get the unique integers array:

public static int[] arrayUnion(int[] a, int[] b){

        HashSet&lt;Integer&gt; set=new HashSet();

        for(int i =0; i&lt; a.length; i++){
            set.add(a[i]);  
        }

        for(int i =0; i&lt; b.length; i++){
            set.add(b[i]);  
        }

        int n = s.size(); 
        int[] result; = new String[n]; 
  
        int j = 0;
        for(Integer i: set) {
            result[j++] = i;
        }

        return result;
}

huangapple
  • 本文由 发表于 2020年10月5日 00:44:16
  • 转载请务必保留本文链接:https://go.coder-hub.com/64197284.html
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