Rust 力扣 - 2653. 滑动子数组的美丽值

题目描述

题解思路

我们遍历长度为k的的窗口

因为数据范围比较小，所以我们可以通过计数排序找到窗口中第k小的数

• 如果小于0，则该窗口的美丽值为第k小的数
• 如果大于等于0，则该窗口的美丽值为0

题解代码

impl Solution {
    pub fn get_subarray_beauty(nums: Vec<i32>, k: i32, x: i32) -> Vec<i32> {
        let mut cnt = [0; 101];

        let get_beauty = |cnt: &mut [i32]| -> i32 {
            let mut count = 0;
            for i in 0..101 {
                count += cnt[i];

                if count >= x {
                    if i < 50 {
                        return i as i32 - 50;
                    }

                    return 0
                }
            }

            0
        };

        for i in 0..k as usize {
            cnt[(nums[i] + 50) as usize] += 1;
        }

        let mut ans = vec![0; nums.len() - k as usize + 1];

        ans[0] = get_beauty(&mut cnt);

        for i in k as usize..nums.len() {
            cnt[(nums[i - k as usize] + 50) as usize] -= 1;
            cnt[(nums[i] + 50) as usize] += 1;

            ans[i - k as usize + 1] = get_beauty(&mut cnt);
        }

        ans
    }
}

题目链接

https://leetcode.cn/problems/sliding-subarray-beauty/