Untitled

<body>
Running <span id="ix">X</span> out of <span id="tot">T</span>, click continue if complains.

<script>
// Author: Dmitri Pavlenkov, 2010

Array.prototype.mask=function(m) {
    var result=[];
    var mask=m;
    var i=0;
    while(mask>0) {
        if(mask&1==1) {
            result.push(this[i]);
        }
        i++;
        mask>>=1;
    }
    return result;
}

Array.prototype.reduce=function(fn,init,pred) {
    if(this.length===0) {
        return init;
    }
    var result=init;
    if(init) {
        result=fn(init,this[0]);
    } else {
        result=this[0];
    }
    for(var i=1;i<this.length;i++) {
        result=fn(result,this[i]);
        if(pred && pred(result)) {
            return result;
        }
    }
    return result;
}


var nums=[3, 4, 9, 14, 15, 19, 28, 37, 47, 50, 54, 56, 59, 61, 70, 73, 78, 81, 92, 95, 97, 99];

var sets=0;
var sums=[];
document.getElementById("tot").innerHTML=nums.length-1;
for(var i=0;i<nums.length-1;i++) {
    document.getElementById("ix").innerHTML=(i+1);
    var mask=Math.pow(2,i+1)-1;
    var sum=nums[i+1];
    while(mask>0) {
        if(!sums[mask]) {
            sums[mask]=nums.mask(mask).reduce(function(a,b) {return a+b;});
        }
        if(sum===sums[mask]) {
            sets++;

        }
        mask--;
    }
}


alert(sets);

</script>

</body>