Manthan, Codefest 18 C. Equalize(思维)

#include <bits/stdc++.h>
using namespace std;
int n;
string str,_str;


int main()
{
	cin>>n>>str>>_str;
	int ans = 0;
	for(int i=0;i<n-1;i++){
		if(str[i] == _str[i]) continue;
		if(str[i] != str[i+1] && str[i+1] != _str[i+1]){
			swap(str[i], str[i+1]);
			ans ++;
		}
	} 
	for(int i=0;i<n;i++){
		if(str[i] != _str[i]) ans ++;
	}
	cout<<ans<<endl;
	return 0;
}