题目描述

样例

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        double x1 = sc.nextDouble(), y1 = sc.nextDouble();
        double x2 = sc.nextDouble(), y2 = sc.nextDouble();
        double a = x1 - x2;
        double b = y1 - y2;
        double d = Math.sqrt(a * a + b * b);
        System.out.printf("%.4f", d);
    }
}

算法1

(暴力枚举) $O(n^2)$

blablabla

时间复杂度

参考文献

C++ 代码

blablabla

算法2

(暴力枚举) $O(n^2)$

blablabla

时间复杂度

参考文献

C++ 代码

blablabla