[CodeForces - 447B] B - DZY Loves Strings

最新推荐文章于 2021-05-31 02:26:41 发布

转载最新推荐文章于 2021-05-31 02:26:41 发布 · 222 阅读

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原文链接：http://www.cnblogs.com/whc200305/p/7215758.html

本文解析了一个字符串处理问题，通过插入特定数量的字符以最大化字符串的评价值。介绍了如何根据字符权重和位置优化字符串，实现算法并提供代码示例。

B - DZY Loves Strings

DZY loves collecting special strings which only contain lowercase letters. For each lowercase letter c DZY knows its value w_c. For each special string s = s₁s₂... s_|s|(|s| is the length of the string) he represents its value with a function f(s), where

$\text{[math]}$

Now DZY has a string s. He wants to insert k lowercase letters into this string in order to get the largest possible value of the resulting string. Can you help him calculate the largest possible value he could get?

Input

The first line contains a single string s (1 ≤ |s| ≤ 10³).

The second line contains a single integer k (0 ≤ k ≤ 10³).

The third line contains twenty-six integers from w_a to w_z. Each such number is non-negative and doesn't exceed 1000.

Output

Print a single integer — the largest possible value of the resulting string DZY could get.

Example

Input

abc
3
1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Output

Note

In the test sample DZY can obtain "abcbbc", value = 1·1 + 2·2 + 3·2 + 4·2 + 5·2 + 6·2 = 41.

题目大意是,给你一个字符串,再给你一个可添加的字符数,然后给你一个公式,要使某个值最大化.

根据公式的特点,我们把ai最大的字符放在越后面输出越好,所以,会出现这种形式:

原串+n个ai最大的字符

那么就解决了.

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<algorithm>
 4 using namespace std;
 5 int a[40],n,ans,x;
 6 int main(){
 7     char s[10005];
 8     scanf("%s",s);
 9     scanf("%d",&n);
10     for (int i=0; i<26; i++) scanf("%d",&a[i]),x=max(x,a[i]);
11     int len=strlen(s);
12     for (int i=0; i<len; i++) ans+=(i+1)*a[s[i]-'a'];
13     for (int i=len; i<=len+n-1; i++) ans+=(i+1)*x;
14     printf("%d",ans);
15     return 0;
16 }

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转载于:https://www.cnblogs.com/whc200305/p/7215758.html