Score : $400$ points

问题描述

给定一个由 X 和 . 组成的字符串 $S$。

你可以在 $0$ 到 $K$ 次（包括）之间对 $S$ 执行以下操作：

• 将一个 . 替换为 X。

在执行完操作后，$S$ 中可能出现的最大连续 X 数量是多少？

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Given is a string $S$ consisting of X and ..

You can do the following operation on $S$ between $0$ and $K$ times (inclusive).

• Replace a . with an X.

What is the maximum possible number of consecutive Xs in $S$ after the operations?

Constraints

• $1 \leq |S| \leq 2 \times 10^5$
• Each character of $S$ is X or ..
• $0 \leq K \leq 2 \times 10^5$
• $K$ is an integer.

Input

Input is given from Standard Input in the following format:

$S$

$K$

Output

Print the answer.

Sample Input 1

XX...X.X.X.
2

Sample Output 1

5

After replacing the Xs at the $7$-th and $9$-th positions with X, we have XX...XXXXX., which has five consecutive Xs at $6$-th through $10$-th positions.
We cannot have six or more consecutive Xs, so the answer is $5$.

Sample Input 2

XXXX
200000

Sample Output 2

4

It is allowed to do zero operations.

update @ 2024/3/10 10:01:15