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 Ruby (judge verdict: Wrong Answer)

aryLocation = gets.split(' ').map(&:to_i);
 
x1 = aryLocation[0];
y1 = aryLocation[1];
x2 = aryLocation[2];
y2 = aryLocation[3];
 
lengthX = x2 - x1;
lengthY = y2 - y1;
 
puts Math.sqrt(lengthX * lengthX + lengthY * lengthY).to_s