bzoj#P1753. [Usaco2005 qua] Who's in the Middle

[Usaco2005 qua] Who's in the Middle

题目描述

FJ is surveying his herd to find the most average cow. He wants to know how much milk this 'median' cow gives: half of the cows give as much or more than the median; half give as much or less.

Given an odd number of cows NN and their milk output, find the median amount of milk given such that at least half the cows give the same amount of milk or more and at least half give the same or less.

输入 NN 个数,输出升序排列后中间那个数。

输入格式

  • Line 11: A single integer NN.
  • Lines 2N+12\sim N+1: Each line contains a single integer that is the milk output of one cow.

输出格式

  • Line 11: A single integer that is the median milk output.
5
2
4
1
3
5
3

样例说明

Five cows with milk outputs of 151\sim 5.

11 and 22 are below 33; 44 and 55 are above 33.

数据规模与约定

对于 100%100\% 的数据:1N<1041 \leq N < 10^411\leq 产奶量 106\leq 10^6

题目来源

Usaco2005 qua