Topic: Arrays
Questions Successfully Completed: 1
<table><tbody><tr><td>1) Find Duplicates in an Array</td><td>Easy</td></tr></tbody></table>

<details><summary>Question</summary><div data-type="detailsContent">Input: N = 5 a[] = {2,3,1,2,3} Output: 2 3  Explanation: 2 and 3 occur more than once in the given array.</div></details>

<pre><code class="lang-java">class Solution {
 public static ArrayList&lt;Integer&gt; duplicates(int arr[], int n) {
 ArrayList&lt;Integer&gt; arrs = new ArrayList&lt;Integer&gt;();
 int[] arrHash = new int[arr.length];

 for(int i = 0;i&lt;n;i++){
 arrHash[arr[i]]++;

 }
 for(int j=0;j&lt;n;j++){
 if(arrHash[j]&gt;1){
 arrs.add(j);
 }
 }
 if(arrs.isEmpty()){
 arrs.add(-1);
 }
 return arrs;
 }
}
</code></pre>
Thank you for reading :)

Topic: **Arrays**

Questions Successfully Completed: 1

<table><tbody><tr><td colspan="1" rowspan="1">1) Find Duplicates in an Array</td><td colspan="1" rowspan="1">Easy</td></tr></tbody></table>

<details data-node-type="hn-details-summary"><summary>Question</summary><div data-type="detailsContent">Input: N = 5 a[] = {2,3,1,2,3} Output: 2 3&nbsp; Explanation: 2 and 3 occur more than once in the given array.</div></details>

```java
class Solution {
 public static ArrayList<Integer> duplicates(int arr[], int n) {
 ArrayList<Integer> arrs = new ArrayList<Integer>();
 int[] arrHash = new int[arr.length];
 
 for(int i = 0;i<n;i++){
 arrHash[arr[i]]++;
 
 }
 for(int j=0;j<n;j++){
 if(arrHash[j]>1){
 arrs.add(j);
 }
 }
 if(arrs.isEmpty()){
 arrs.add(-1);
 }
 return arrs;
 }
}
```

Thank you for reading :)

DSA Day 74/100