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)

var input = '';
var readable = process.stdin;
readable.resume();
readable.setEncoding( 'utf-8' );
readable.on( 'data', function( chunk ) {
  input += chunk;
});

readable.on( 'end', function() {
  var data = input.split( " " );
  var x1 = parseFloat( data[0] );
  var y1 = parseFloat( data[1] );
  var x2 = parseFloat( data[2] );
  var y2 = parseFloat( data[3] );
  
  var d = Math.sqrt( Math.pow( x1-x2, 2 )+Math.pow( y1-y2, 2 ) );
  console.log( d );
});