贪心

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	string str;
	vector<bool>day(n,0);
	vector<bool>night(n,0);
	string s1,s2;
	cin>>s1>>s2;
	int h=0;
	for(int i=0;i<n;i++){
		if(s1[i]=='N'&&s2[i]=='N')continue;
		if(s1[i]=='Y'&&s2[i]=='N')h+=2;
		if(s1[i]=='N'&&s2[i]=='Y')h+=2;
		if(s1[i]=='Y'&&s2[i]=='Y')h+=3;
	}
	cout<<h;
}