Hackertrail Fixx Digital Code Challenge Feb 2016

solution.js

// bake your code here
importPackage(java.io);
importPackage(java.lang);
var stdin = new BufferedReader(new InputStreamReader(System['in']));
var numberOfPackets = parseInt(stdin.readLine(), 10);

while (numberOfPackets >= 1) {
    var totalCandies = 0;
    var candyPackets = [];
    var numberOfMoves = 0;
    
    for (var i = 0; i < numberOfPackets; i++) {
       var candiesInPacket = parseInt(stdin.readLine(), 10);
       candyPackets.push(candiesInPacket);
       totalCandies += candiesInPacket;
    }
    
    if (totalCandies % numberOfPackets > 0) {
        print(-1);
    } else {
        var averageCandies = totalCandies / numberOfPackets;
        candyPackets.forEach(function(candiesInPacket) {
          if (candiesInPacket > averageCandies) { numberOfMoves += candiesInPacket - averageCandies }
        })
        print(numberOfMoves);
    }
    
    numberOfPackets = stdin.readLine();
}