edu round 9 B-Alice, Bob, Two Teams

最新推荐文章于 2020-02-03 15:49:07 发布

LeeHolmes

最新推荐文章于 2020-02-03 15:49:07 发布

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分类专栏： codeforces 文章标签： codeforces

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Alice and Bob are playing a game. The game involves splitting up game pieces into two teams. There are n pieces, and the i-th piece has a strength p_i.

The way to split up game pieces is split into several steps:

First, Alice will split the pieces into two different groups A and B. This can be seen as writing the assignment of teams of a piece in ann character string, where each character is A or B.
Bob will then choose an arbitrary prefix or suffix of the string, and flip each character in that suffix (i.e. change A to B and B to A). He can do this step at most once.
Alice will get all the pieces marked A and Bob will get all the pieces marked B.

The strength of a player is then the sum of strengths of the pieces in the group.

Given Alice's initial split into two teams, help Bob determine an optimal strategy. Return the maximum strength he can achieve.

Input

The first line contains integer n (1 ≤ n ≤ 5·10⁵) — the number of game pieces.

The second line contains n integers p_i (1 ≤ p_i ≤ 10⁹) — the strength of the i-th piece.

The third line contains n characters A or B — the assignment of teams after the first step (after Alice's step).

Output

Print the only integer a — the maximum strength Bob can achieve.

Examples

input

5
1 2 3 4 5
ABABA

output

input

5
1 2 3 4 5
AAAAA

output

input

1
1
B

output

Note

In the first sample Bob should flip the suffix of length one.

In the second sample Bob should flip the prefix or the suffix (here it is the same) of length 5.

In the third sample Bob should do nothing.

就是交换两个集合里的东西，使B最大；

#include<bits/stdc++.h>
using namespace std;
long long int p[600000];
char s[600000];
int main()
{
    int n;
    scanf("%d",&n);
    for(int i=0;i<n;++i)
        scanf("%I64d",&p[i]);
    scanf(" %s",&s);
    long long int ans,sa=0,sb=0;
    for(int i=0;i<n;++i)
    {
        if(s[i]=='A')
        {
            sa+=p[i];
        }
        else
        {
            sb+=p[i];
        }
    }
    ans=max(sa,sb);
    long long int za=0,zb=0,da,db;
    for(int i=0;i<n;++i)
    {
        if(s[i]=='A')
        {
            za+=p[i];
        }
        else
        {
            zb+=p[i];
        }
        da=sa-za;
        db=sb-zb;
        ans=max(ans,max(za+db,zb+da));
    }
    cout<<ans<<endl;
    return 0;
}