1222 : radius

时间限制Time Limit 1 秒Sec 内存限制Memory Limit 128 兆MB 提交次数Submitted 115 次Times 通过次数Solved 16 次Times

特判评测 Special

读写方式与标准评测相同。答案可能不唯一，是否正确由本题的特判程序判定，输出格式以题面为准。 I/O is the same as standard judge. Several outputs may be valid; this problem’s special judge decides correctness. Follow the output format in the statement.

输入Input	标准输入。Standard input.
输出Output	标准输出，格式以题面为准。Standard output; format as specified in the statement.

模板Template

C++ C Java Python

#include <iostream>
using namespace std;
int main() {
    int a, b;
    cin >> a >> b;
    cout << (a + b) << endl;
    return 0;
}

#include <stdio.h>
int main() {
    int a, b;
    scanf("%d%d", &a, &b);
    printf("%d\n", a + b);
    return 0;
}

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        System.out.println(a + b);
    }
}

a, b = map(int, input().split())
print(a + b)

题目描述Description

There are \(n\) distinct points in three-dimensional space，the coordinate of the i-th point is represented by \((x_i,y_i,z_i)\).

A compliant sphere is defined as having its center on the coordinate axis, and at least \(\lfloor n / 2 \rfloor\) points within or on its surface. What is the minimum radius of the compliant sphere.

输入格式Input

The first line contains an integer \(n (1 \leq n \leq 10000)\).

Next n lines each contains three integers \(x_i , y_i, z_i.(\mid x_i\mid , \mid y_i \mid, \mid z_i \mid \leq 10000)\).

输出格式Output

The minimum radius.

Your answer will be considered correct if its absolute or relative error does not exceed \(10^{-6}\).

样例Sample

来源Source

湖南省第十九届大学生计算机程序设计竞赛（HNCPC2023）