CCF201509-1数列分段(JAVA版)

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

public class Main{
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int res = 0;
        int last = -1;
        while(n-->0) {
            int a = scanner.nextInt();
            if(a != last) {
                res++;last = a;
            }
        }
        System.out.println(res);
    }
}