[LintCode] Top k Largest Numbers II

jindong 发布于2019-08-15 14:23 / 1979人阅读

Problem

Implement a data structure, provide two interfaces:

add(number). Add a new number in the data structure.
topk(). Return the top k largest numbers in this data structure. k is given when we create the data structure.

Example

s = new Solution(3);
>> create a new data structure.
s.add(3)
s.add(10)
s.topk()
>> return [10, 3]
s.add(1000)
s.add(-99)
s.topk()
>> return [1000, 10, 3]
s.add(4)
s.topk()
>> return [1000, 10, 4]
s.add(100)
s.topk()
>> return [1000, 100, 10]

Tags

Heap Priority Queue

Solution

public class Solution {
    /*
    * @param k: An integer
    */
    Queue pq;
    int size;
    public Solution(int k) {
        // do intialization if necessary
        pq = new PriorityQueue();
        size = k;
    }

    /*
     * @param num: Number to be added
     * @return: nothing
     */
    public void add(int num) {
        // write your code here
        if (pq.size() < size) pq.offer(num);
        else if (pq.peek() < num) {
            pq.poll();
            pq.offer(num);
        }
        return;
    }

    /*
     * @return: Top k element
     */
    public List topk() {
        // write your code here
        Iterator it = pq.iterator();
        List res = new ArrayList<>();
        while (it.hasNext()) {
            res.add((Integer) it.next());
        }
        Collections.sort(res, Collections.reverseOrder());
        return res;
    }
}

云服务器 GPU云服务器 Largest Numbers LintCode LintCode134_LRU

文章版权归作者所有，未经允许请勿转载,若此文章存在违规行为，您可以联系管理员删除。

转载请注明本文地址：https://www.ucloud.cn/yun/68577.html

[LintCode] Top k Largest Numbers I

Problem Given an integer array, find the top k largest numbers in it. Example Given [3,10,1000,-99,4,100] and k = 3.Return [1000, 100, 10]. Tags Heap Priority Queue Solution public class Solution { ...

solocoder 2019-08-15 13:25 评论0 收藏0
[LintCode] Kth Largest Element [PriorityQueue]

摘要：可以不要用太简单的方法。先把它装满，再和队列顶端的数字比较，大的就替换掉，小的就。遍历完所有元素之后，顶部的数就是第大的数。 Problem Find K-th largest element in an array. Example In array [9,3,2,4,8], the 3rd largest element is 4.In array [1,2,3,4,5], the...

Hwg 2019-08-14 15:12 评论0 收藏0
[LeetCode/LintCode] Largest Palindrome Product

Problem Find the largest palindrome made from the product of two n-digit numbers. Since the result could be very large, you should return the largest palindrome mod 1337. Example Input: 2Output: 987Ex...

Barry_Ng 2019-08-15 18:16 评论0 收藏0
[LintCode/LeetCode] Combination Sum I & II

摘要：和唯一的不同是组合中不能存在重复的元素，因此，在递归时将初始位即可。 Combination Sum I Problem Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T...

ThreeWords 2019-08-14 15:23 评论0 收藏0
[LintCode/LeetCode] Single Number I & II [位运算]

摘要：整个过程相当于，直接在和里去掉既是又是的。所以最后返回的，一定是只出现过一次的，而出现两次的都在里，出现三次的都被消去了。 Single Number I Problem Given 2*n + 1 numbers, every numbers occurs twice except one, find it. Example Given [1,2,2,1,3,4,3], return...

Drinkey 2019-08-14 15:33 评论0 收藏0