/**
 * initialize your data structure here.
 */
var MedianFinder = function() {
    this.maxHeap = new Heap('max');
    this.minHeap = new Heap('min');
    this.count = 0;
};

/**
 * @param {number} num
 * @return {void}
 */
MedianFinder.prototype.addNum = function(num) {
      this.count++;
      if (this.count % 2 === 1) {

        this.maxHeap.add(num);
        this.minHeap.add(this.maxHeap.pop());
      } else {
        this.minHeap.add(num);
        this.maxHeap.add(this.minHeap.pop());
      }
};

/**
 * @return {number}
 */
MedianFinder.prototype.findMedian = function() {
     if (this.count === 0) {
        return 0;
      }
      if (this.count % 2 === 1) {
        return this.minHeap.value[0];
      } else {
        return (this.minHeap.value[0] + this.maxHeap.value[0]) / 2
      }
};


    function Heap(