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 Rust (1.42.0) (judge verdict: Wrong Answer)

use std::io::{stdin, BufRead};
fn main() {
    let stdin = stdin();
    let mut stdinlock = stdin.lock();
    let mut n = String::new();
    let _ = stdinlock.read_line(&mut n);
    let n: usize = n.trim().parse().expect("N");
    let mut v: Vec<u64> = Vec::with_capacity(n);
    for line in stdinlock.lines() {
        v.push(line.expect("line").trim().parse().expect("parse"));
    }
    v.sort();
    let mut n = 0;
    let mut current = v[0];
    let mut oddness = true;
    for &ai in &v[1..] {
        if ai == current {
            oddness = !oddness;
        } else {
            if oddness {
                n += 1;
            }
            current = ai;
            oddness = true;
        }
    }
    println!("{}", n);
}