思路:
后一个和前一个不相等就算一段
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int a[] = new int[n];
for(int i=0;i<n;i++) {
a[i] = sc.nextInt();
}
int count = 1;
for(int j=0;j<n-1;j++) {
if(a[j] != a[j+1]) {
count++;
}
}
sc.close();
System.out.println(count);
}
}