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- import java.util.Scanner;
- public class B {
- public static void main(String[] args) {
- Scanner cin = new Scanner(System.in);
- double x1 = cin.nextDouble();
- double y1 = cin.nextDouble();
- double x2 = cin.nextDouble();
- double y2 = cin.nextDouble();
- System.out.println(String.format("%.3f", Math.hypot(x1 - x2, y1 - y2)));
- cin.close();
- }
- }
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