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 Python3 (judge verdict: Wrong Answer)

#!/usr/bin/env python

def sqroot(n):
    x = 1
    for i in range(10):
        x = (x + n/x)/2
    return x

x1, y1, x2, y2 = input().split()
x1 = float(x1)
x2 = float(x2)
y1 = float(y1)
y2 = float(y2)

distance = sqroot((x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1))

print(distance)