L - Donald is a postman

Donald Duck works as a postman for the Walt Disney Studios. He delivers children’s letters from all over the world to his friends, which are cartoon characters. The Studios has three cases for the letters, with nine sections in each case. Every section has the name of the receiver on it. All cases stand in a row as it is shown at the picture below.

Donald Duck have brought n letters today. Initially, he stands near the leftmost case. He has to make one step to go to the neighboring case or to the previous one. How many steps will he make until he puts all the letters into the respective sections, if he does this in the order they are in his bag?

Input

The first line contains an integer n that is the amount of letters in Donald’s bag (1 ≤ n ≤ 1 000). The following n lines contain receivers of the letters in the order they are in the bag.

Output

Output the number of steps Donald should make to put all the letters into the cases.

Example

input	output
4 Aurora Tiana Ariel Mulan	5

Hint

题意：

三个盒子上面每个有9个不同的信箱，相邻的盒子之间的距离为1，要将n封信放入不同信箱，问总共需要走几步》

思路：

预处理一下各个名字在哪个case里面，然后在按照输入顺序移动即可！

代码：

#include<bits./stdc++.h>
using namespace std;
int main()
{
	//freopen("aaa.txt","r",stdin);
	int n,i,x,y,sum=0;
	string s;
	char c;
	map<char,int>a;
	a['A']=0;a['P']=0; a['O']=0; a['R']=0;
	a['B']=1; a['M']=1; a['S']=1;
	a['D']=2; a['G']=2; a['J']=2; a['K']=2; a['T']=2; a['W']=2; 
	cin>>n;
	cin>>s; c=s[0];
	x=a[c]; sum=x;
	for(i=1;i<n;i++)
	{
		cin>>s;
		c=s[0];
		y=a[c];
		sum+=fabs(y-x);
		x=y;
	}
	cout<<sum<<endl;
	return 0;
} 

心得：
今天5小时 和队友就AC了两个水题，好气好气好气好气 ！！！！！！！！！！！！！！！！！！感觉自己弱爆了