Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 1670   Accepted: 823 Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output the median (midd…

由于我不会讲对顶堆,所以这里直接传上一个巨佬的学习笔记. 对顶堆其实还是很容易理解的,想这题的时候自己猜做法也能把没学过的对顶堆给想出来.后来了解,对顶堆主要还是动态的在线维护集合$K$大值.当然也可以带删除.但是可能退化,具体见另外一个题的说明. 像这题维护中位数就是要求第$N/2+1$大的数,所以可以让大根堆维护前$n/2$项,小根堆维护后$n/2+1$项(这里指排好序的).然后每次插入的时候及时调整即可,由于调整幅度不大,所以可以保证复杂度是$log$级别的. 代码被我写繁了因为我当时还不…

Running Median Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 3406   Accepted: 1576 Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=3282 Running Median Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output the median (middle value) of th…

2015-07-16 问题简述: 动态求取中位数的问题,输入一串数字,每输入第奇数个数时求取这些数的中位数. 原题链接:http://poj.org/problem?id=3784 解题思路: 求取中位数的方法常常想到使用堆来实现:取一个大顶堆,一个小顶堆,使大顶堆的堆顶记录中位数,因此,要时刻保持大顶堆堆顶元素小于小顶堆堆顶元素,且大顶堆元素个数等于小顶堆元素个数或等于小顶堆元素个数加一. 以下有两种堆得实现方法: 一:直接使用STL中的函数(make_heap,push_heap,pop_h…

Running Median Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=3282 Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read…

Running Median Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output the median (middle value) of the elements received so far. Input The first line of…

浅谈堆:https://www.cnblogs.com/AKMer/p/10284629.html 题目传送门:http://poj.org/problem?id=3784 用一个"对顶堆"动态维护中位数. 一个大根堆维护前半部分的权值,一个小根堆维护后半部分的权值. 新进来一个数如果小于大根对的权值就加进大根对,否则就加进小根堆. 每次动态维护大小,使得大根堆的大小为数字的一半. 大根对的堆顶就是中位数. 为了方便我把大根堆里的数取了个反也就变小根堆了. 时间复杂度:\(O(Tnlo…

For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output the median (middle value) of the elements received so far. Input The first line of input contains a single int…

Description For this problem, you will write a program that reads in a sequence of 32-bit signed integers. After each odd-indexed value is read, output the median (middle value) of the elements received so far. Input The first line of input contains…