Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window.
Example:
MovingAverage m = new MovingAverage(3); m.next(1) = 1 m.next(10) = (1 + 10) / 2 m.next(3) = (1 + 10 + 3) / 3 m.next(5) = (10 + 3 + 5) / 3
Java Solution:
class MovingAverage {
/** Initialize your data structure here. */
private Queue<Integer> q;
private double sum;
private int maxSize;
public MovingAverage(Integer size) {
q = new LinkedList<Integer>();
maxSize = size;
sum = 0;
}
public double next(int val) {
if(q.size() != maxSize){
q.offer(val);
sum+=val;
return sum / q.size();
}else{
sum-=q.peek(); // subtracting from sum before removing the first element
q.poll();
q.offer(val);
sum+=val;
return sum / q.size();
}
}
}
/**
* Your MovingAverage object will be instantiated and called as such:
* MovingAverage obj = new MovingAverage(size);
* double param_1 = obj.next(val);
*/
