9度oj 题目1004：Median【排序水题】

时间限制：1 秒

内存限制：32 兆

特殊判题：否

提交：12541

解决：3434

题目描述：

Given an increasing sequence S of N integers, the median is the number at the middle position. For example, the median of S1={11, 12, 13, 14} is 12, and the median of S2={9, 10, 15, 16, 17} is 15. The median of two sequences
is defined to be the median of the non-decreasing sequence which contains all the elements of both sequences. For example, the median of S1 and S2 is 13.

Given two increasing sequences of integers, you are asked to find their median.

输入：

Each input file may contain more than one test case.

Each case occupies 2 lines, each gives the information of a sequence. For each sequence, the first positive integer N (≤1000000) is the size of that sequence. Then N integers follow, separated by a space.

It is guaranteed that all the integers are in the range of long int.

输出：

For each test case you should output the median of the two given sequences in a line.

样例输入：

4 11 12 13 14
5 9 10 15 16 17

样例输出：

13

来源：

2011年浙江大学计算机及软件工程研究生机试真题

题意：给出2个数组，合并后求中位数，如果是偶数个，输出中间2个中的第一个。

import java.util.Arrays;
import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner cin = new Scanner(System.in);
		while(cin.hasNext())
		{
			int n,m,i;
			long[] a = new long[2000100];
			n = cin.nextInt();
			for (i = 0; i < n; i++)
			{
				a[i] = cin.nextLong();
			}
			m = cin.nextInt();
			n+=m;
			for (; i < n; i++)
			{
				a[i] = cin.nextLong();
			}
			Arrays.sort(a,0,n);
			System.out.println(a[(n-1)/2]);
		}
		cin.close();
	}
}