Problem:
Score : 300 points

Problem Statement

You are playing the following game with Joisino.

Initially, you have a blank sheet of paper.

Joisino announces a number. If that number is written on the sheet, erase the number from the sheet; if not, write the number on the sheet. This process is repeated N times.

Then, you are asked a question: How many numbers are written on the sheet now?

The numbers announced by Joisino are given as A_1, ... ,A_N in the order she announces them. How many numbers will be written on the sheet at the end of the game?

Constraints

1≤N≤100000

1≤A_i≤1000000000(=10^9)

All input values are integers.

Input

Input is given from Standard Input in the following format:

N
A_1
:
A_N

Output

Print how many numbers will be written on the sheet at the end of the game.

Sample Input 1

3
6
2
6

Sample Output 1

1

The game proceeds as follows:

6 is not written on the sheet, so write 6.

2 is not written on the sheet, so write 2.

6 is written on the sheet, so erase 6.

Thus, the sheet contains only 2 in the end. The answer is 1.

Sample Input 2

4
2
5
5
2

Sample Output 2

0

It is possible that no number is written on the sheet in the end.

Sample Input 3

6
12
22
16
22
18
12

Sample Output 3

2

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try(Scanner scan = new Scanner(System.in)){
			int N = scan.nextInt();
			int[] A = new int[N];
			
			int count =0;
			
			
			for(int i=0;i<N;i++) {//拡張for文は指示できるものと：格納したもの達
				A[i] = scan.nextInt();
			}
			
			Arrays.sort(A);
			
			StringBuffer sb = new StringBuffer();
			
			for(int i = 0;i<N;i++) {
				sb.append(String.valueOf(A[i]));
			}
			
			int start =0;
			int fin =0;
						
			for(int i = 0;i<N-1;i++) {
				
				if(A[i]!=A[i+1]) {
					fin = i+1;
					String sub = sb.toString().substring(start, fin);
					
					if(sub.length()%2==1) {
						count+=1;
					}
					start = i+1;	
					
					if(i==N-2) {
						count+=1;
					}
				}
				
				
				
			}
			
			
			System.out.println(count);
						
		}
		
	}

}