Moving Average Calculator

You are given a time series of prices for consecutive days and an integer window size k. Your task is to compute the simple moving average. For each day i (1-indexed), if there are fewer than k prices available (i.e. when i < k), output None. Otherwise, output the average of the last k prices rounded to one decimal place.

The moving average for a window of k consecutive days is computed using the formula:

$$\text{avg} = \frac{price_{i-k+1} + price_{i-k+2} + \cdots + price_{i}}{k}$$

Note that the input is provided via standard input (stdin) and the output should be written to standard output (stdout).

inputFormat

The first line contains two space-separated integers: n (the number of days) and k (the moving average window size). The second line contains n space-separated numbers representing the prices for each consecutive day.

outputFormat

Output n space-separated values. For the days where the moving average cannot be computed (i.e. when there are fewer than k prices), output None. Otherwise, output the moving average rounded to one decimal place.

5 3
1 2 3 4 5

None None 2.0 3.0 4.0