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 JavaScript (judge verdict: Accepted)

//config = {stdin: 'tmp', newline: '\r\n'}; // win
config = {stdin: '/dev/stdin', newline: '\n'}; // linux

line = require('fs').readFileSync(config.stdin, 'ascii').split(' ')
       .map(Number);
dx = line[2] - line[0], dy = line[3] - line[1];
console.log(Math.sqrt(dx * dx + dy * dy));