3rd Grade Maths Problem Solver (Brute Force)

gistfile1.js

var processor2 = function(v) {
	return ((13*v[1])/v[2])+v[0]+v[3]+12*v[4]-v[5] + ((v[6]*v[7])/v[8]) == 87;
}

var start_time = Date.now(),
	total_combinations = 0,
	pv = [1,2,3,4,5,6,7,8,9],
	permArr = [],
	usedChars = [];

function permute(input) {
  var i, ch;
  for (i = 0; i < input.length; i++) {
    ch = input.splice(i, 1)[0];
    usedChars.push(ch);
    if (input.length == 0) {
		if (processor2(usedChars)) {
			permArr.push(usedChars.slice());
		} else {
			usedChars.slice();
		}
    }
    permute(input);
    input.splice(i, 0, ch);
    usedChars.pop();
  }
  return permArr
};

permute(pv);
var finish_time = Date.now();
var time_taken = finish_time - start_time;
console.log("Total Combinations:" + permArr.length);
console.log("Total Time: " + time_taken);