Codeforces 710B-Optimal Point on a Line

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本文介绍了一种算法问题，即给定直线上的一组坐标点，如何找出一个位置使得该位置到所有给定点的距离之和最小。通过排序并选择中位数的方法可以有效地解决这一问题。

B. Optimal Point on a Line

time limit per test：1 second

memory limit per test：256 megabytes

input：standard input

output：standard output

You are given n points on a line with their coordinatesx_i. Find the pointx so the sum of distances to the given points is minimal.

Input

The first line contains integer n (1 ≤ n ≤ 3·10⁵) — the number of points on the line.

The second line contains n integers x_i ( - 10⁹ ≤ x_i ≤ 10⁹) — the coordinates of the givenn points.

Output

Print the only integer x — the position of the optimal point on the line. If there are several optimal points print the position of the leftmost one. It is guaranteed that the answer is always the integer.

Example

Input

4
1 2 3 4

Output

解：在一条线上给定一组坐标，找到一点到其余各点之间的距离最小。对坐标进行排序一下，中间的坐标则到各个坐标的距离最小。

#include<stdio.h>
#include<string.h>
#include<algorithm>
#include<iostream>
using namespace std;
int a[300005];

int main()
{
	long long n;
	while(~scanf("%I64d",&n)){
		memset(a,0,sizeof(a));
		for(long long i=0;i<n;i++){
			scanf("%d",&a[i]);
		}
		sort(a,a+n);
		printf("%d\n",a[(n-1)/2]);
	}
	return 0;
}