题解

代码很短，很好理解，短小精悍

#include <iostream>
#define ll long long
using namespace std;

int main() {
	ll n;
	cin >> n;
	string A;
	string B;
	cin >> A >> B;
	ll ans = 0;
	bool mm = false;
	for (ll i = 0; i < n; i++) {
		if (A[i] != B[i]) {
			if (!mm) {
				mm = true;
				ans++;
			}
		} else {
			mm = false;
		}
	}
	cout << ans << endl;
}