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406-根据身高重建队列(Queue Reconstruction by Height)
发表于:2021-12-03 | 分类: 中等
字数统计: 764 | 阅读时长: 3分钟 | 阅读量:

原文链接: https://leetcode-cn.com/problems/queue-reconstruction-by-height

英文原文

You are given an array of people, people, which are the attributes of some people in a queue (not necessarily in order). Each people[i] = [hi, ki] represents the ith person of height hi with exactly ki other people in front who have a height greater than or equal to hi.

Reconstruct and return the queue that is represented by the input array people. The returned queue should be formatted as an array queue, where queue[j] = [hj, kj] is the attributes of the jth person in the queue (queue[0] is the person at the front of the queue).

 

Example 1:

Input: people = [[7,0],[4,4],[7,1],[5,0],[6,1],[5,2]]
Output: [[5,0],[7,0],[5,2],[6,1],[4,4],[7,1]]
Explanation:
Person 0 has height 5 with no other people taller or the same height in front.
Person 1 has height 7 with no other people taller or the same height in front.
Person 2 has height 5 with two persons taller or the same height in front, which is person 0 and 1.
Person 3 has height 6 with one person taller or the same height in front, which is person 1.
Person 4 has height 4 with four people taller or the same height in front, which are people 0, 1, 2, and 3.
Person 5 has height 7 with one person taller or the same height in front, which is person 1.
Hence [[5,0],[7,0],[5,2],[6,1],[4,4],[7,1]] is the reconstructed queue.

Example 2:

Input: people = [[6,0],[5,0],[4,0],[3,2],[2,2],[1,4]]
Output: [[4,0],[5,0],[2,2],[3,2],[1,4],[6,0]]

 

Constraints:

  • 1 <= people.length <= 2000
  • 0 <= hi <= 106
  • 0 <= ki < people.length
  • It is guaranteed that the queue can be reconstructed.

中文题目

假设有打乱顺序的一群人站成一个队列,数组 people 表示队列中一些人的属性(不一定按顺序)。每个 people[i] = [hi, ki] 表示第 i 个人的身高为 hi ,前面 正好ki 个身高大于或等于 hi 的人。

请你重新构造并返回输入数组 people 所表示的队列。返回的队列应该格式化为数组 queue ,其中 queue[j] = [hj, kj] 是队列中第 j 个人的属性(queue[0] 是排在队列前面的人)。

 

示例 1:

输入:people = [[7,0],[4,4],[7,1],[5,0],[6,1],[5,2]]
输出:[[5,0],[7,0],[5,2],[6,1],[4,4],[7,1]]
解释:
编号为 0 的人身高为 5 ,没有身高更高或者相同的人排在他前面。
编号为 1 的人身高为 7 ,没有身高更高或者相同的人排在他前面。
编号为 2 的人身高为 5 ,有 2 个身高更高或者相同的人排在他前面,即编号为 0 和 1 的人。
编号为 3 的人身高为 6 ,有 1 个身高更高或者相同的人排在他前面,即编号为 1 的人。
编号为 4 的人身高为 4 ,有 4 个身高更高或者相同的人排在他前面,即编号为 0、1、2、3 的人。
编号为 5 的人身高为 7 ,有 1 个身高更高或者相同的人排在他前面,即编号为 1 的人。
因此 [[5,0],[7,0],[5,2],[6,1],[4,4],[7,1]] 是重新构造后的队列。

示例 2:

输入:people = [[6,0],[5,0],[4,0],[3,2],[2,2],[1,4]]
输出:[[4,0],[5,0],[2,2],[3,2],[1,4],[6,0]]

 

提示:

  • 1 <= people.length <= 2000
  • 0 <= hi <= 106
  • 0 <= ki < people.length
  • 题目数据确保队列可以被重建

通过代码

高赞题解

/**
 * 解题思路:先排序再插入
 * 1.排序规则:按照先H高度降序,K个数升序排序
 * 2.遍历排序后的数组,根据K插入到K的位置上
 *
 * 核心思想:高个子先站好位,矮个子插入到K位置上,前面肯定有K个高个子,矮个子再插到前面也满足K的要求
 *
 * @param people
 * @return
 */
public int[][] reconstructQueue(int[][] people) {
    // [7,0], [7,1], [6,1], [5,0], [5,2], [4,4]
    // 再一个一个插入。
    // [7,0]
    // [7,0], [7,1]
    // [7,0], [6,1], [7,1]
    // [5,0], [7,0], [6,1], [7,1]
    // [5,0], [7,0], [5,2], [6,1], [7,1]
    // [5,0], [7,0], [5,2], [6,1], [4,4], [7,1]
    Arrays.sort(people, (o1, o2) -> o1[0] == o2[0] ? o1[1] - o2[1] : o2[0] - o1[0]);

    LinkedList<int[]> list = new LinkedList<>();
    for (int[] i : people) {
        list.add(i[1], i);
    }

    return list.toArray(new int[list.size()][2]);
}

统计信息

通过次数 提交次数 AC比率
127509 172581 73.9%

提交历史

提交时间 提交结果 执行时间 内存消耗 语言

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