CCF CSP201509-1数列分段

#include<iostream>
using namespace std;
int main(){
	int n, ans = 1, pre;
	cin>>n;
	for(int i = 0; i < n; i++){
		int num;
		cin>>num;
		if(i == 0) pre = num;
		if(pre!=num) ans++,pre = num;
	}
	cout<<ans<<endl;
	return 0;
}