Goat, Wolf, Lion Joke

gistfile1.js

//Solves that silly goat/wolf/lion problem
//
// From this challenge: http://unriskinsight.blogspot.dk/2014/06/fast-functional-goats-lions-and-wolves.html
//
// Example performance on input:  1017 1055 1006
//
//   C++:  31.695 s
//   JS:   0.059 s
//
// Checkmate C++?

function findAB(l, g, w) {
  var d = g + w
  if(d % 2 !== 0) {
    return -1
  }
  var c = (d / 2)|0
  var ab = c - g
  return l - Math.abs(ab) + c
}

function solve(pop) {
  for(var i=0; i<3; ++i) {
    var x = findAB(pop[i], pop[(i+1)%3], pop[(i+2)%3])
    if(x >= 0) {
      var res = [0,0,0]
      res[i] = x
      console.log(res)
    }
  }
}

var args = process.argv.slice(2).map(function(x) { return +x })
solve(args)

nice! line 33 could also be .map(Number)