Problem:
Distance

Write a program which calculates the distance between two points P1(x1, y1) and P2(x2, y2).

Input

Four real numbers x1, y1, x2 and y2 are given in a line.

Output

Print the distance in real number. The output should not contain an absolute error greater than 10-4.

Sample Input

0 0 1 1

Sample Output

1.41421356

Solution in JAVA (judge verdict: Wrong Answer)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.Math.*;
import java.util.*;
import java.math.*;
import java.text.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        BigDecimal x1 = sc.nextBigDecimal();
        BigDecimal y1 = sc.nextBigDecimal();
        BigDecimal x2 = sc.nextBigDecimal();
        BigDecimal y2 = sc.nextBigDecimal();
        BigDecimal distance = new BigDecimal(Math.sqrt(Math.pow(Math.abs(x1.doubleValue()-x2.doubleValue()),2) 
                                                     + Math.pow(Math.abs(y1.doubleValue()-y2.doubleValue()),2)));
        NumberFormat nf = NumberFormat.getInstance();
        nf.setMaximumFractionDigits(8);
        System.out.println(nf.format(distance));
    }
}