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sockMerchant.java
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sockMerchant.java
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import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;
public class Solution {
// Complete the sockMerchant function below.
static int sockMerchant(int n, int[] ar)
{
HashSet<Integer> socks = new HashSet<>();
int count=0;
for(int i=0; i<n; i++)
{
if(socks.contains(ar[i]))
{
count++;
socks.remove(ar[i]);
}
else
socks.add(ar[i]);
}
return count;
}
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) throws IOException {
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
int n = scanner.nextInt();
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
int[] ar = new int[n];
String[] arItems = scanner.nextLine().split(" ");
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
for (int i = 0; i < n; i++) {
int arItem = Integer.parseInt(arItems[i]);
ar[i] = arItem;
}
int result = sockMerchant(n, ar);
bufferedWriter.write(String.valueOf(result));
bufferedWriter.newLine();
bufferedWriter.close();
scanner.close();
}
}