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class MedianFinder {
public:
    priority_queue<int,vector<int>,greater<int>>left; //maxheap
    priority_queue<int,vector<int>,less<int>>right; //minheap

    MedianFinder() {
    }
    
    void addNum(int num) {
        if (right.empty() || num > right.top()) {
            left.push(num);
        } else {
            right.push(num);
        }

        //maintain size diff of <=1
        if(left.size()> right.size()+1){
            right.push(left.top());
            left.pop();
        }else if(right.size()>left.size()+1){
            left.push(right.top());
            right.pop();
        }
    }
    
    double findMedian() {
        double ans=0;
        if(left.size()==right.size()){
            if(right.empty()) return 0;
            else{
                double avg=(left.top() +right.top())/(2.0);
                return avg;
            }
        }else{
            return right.size()>left.size() ?right.top():left.top();
        }
    }
};

/**
 * Your MedianFinder object will be instantiated and called as such:
 * MedianFinder* obj = new MedianFinder();
 * obj->addNum(num);
 * double param_2 = obj->findMedian();
 */