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题目描述

题解思路

本题可以转换为求长度为k的子数组中白色块的最少数量

我们遍历长度为k的窗口，我们只需要记录窗口内的白色块的数量即可，遍历过程中刷新白色块的数量的最小值

题解代码

impl Solution {pub fn minimum_recolors(blocks: String, k: i32) -> i32 {let blocks = blocks.as_bytes();let mut sum = 0;for i in 0..k as usize {if blocks[i] == b'W' {sum += 1;}}let mut min_sum = sum;for i in k as usize..blocks.len() {if blocks[i] == b'W' {sum += 1;}if blocks[i-k as usize] == b'W' {sum -= 1;}min_sum = min_sum.min(sum);}min_sum}
}

题目链接

https://leetcode.cn/problems/minimum-recolors-to-get-k-consecutive-black-blocks/