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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <p id="hello">Hello World</p>
</body>
</html>
var seeds = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16],
    num_rounds = Math.log(seeds.length)/Math.log(2);
//2-dimensional array, each subarray holds the seeds active in that round, in order of matches played
//example: seeds in first match of 2nd round are: seed_round[1][0] & seed_round[1][1]
var seed_rounds=[];
    
//messy here, just creates empty arrays inside seed_round
for (var i=0;i<num_rounds;i++) {
  seed_rounds[i]=[];  
}
//assuming no upsets in the bracket, 1st and 2nd seeds should be in the final match
seed_rounds[num_rounds] = [1,2];
//for each round in the bracket
for (var r=num_rounds;r>0;r--) {
  var round=seed_rounds[r];
  var feed_round=seed_rounds[r-1];
      
  //for each seed in the round, work out the who they defeated in the previous round, storing the resil
  for (var m=0;m<round.length;m++) {
    
    var num_teams_in_round = round.length*2;
    //feeder match seed A = current match seed "m"
    feed_round[m*2]=round[m];
    
    //feeder match seed B = # teams in feeder round plus 1 minus current match seed "m" 
    feed_round[(m*2)+1]=num_teams_in_round+1-round[m];
  }
}
console.log("seeds:"+seed_rounds[1]);
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