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General information for the business: data structures question
Description of requirements/functionality: General information for the business: js or python or any other language
Description of requirements/functionality: For this problem, you are given N days of average home sale price data, and a fixed window size K . For each window of K days, from left to right, find the number of increasing subranges within the window minus the number of decreasing subranges within the window.

A window of days is defined as a contiguous range of days. Thus, there are exactly N-K+1 windows where this metric needs to be computed. An increasing subrange is defined as a contiguous range of indices [a,b], a < b , where each element is larger than the previous element. A decreasing subrange is similarly defined, except each element is smaller than the previous element.
Constraints
1 ≤ N ≤ 200,000 days
1 ≤ K ≤ N days
Input Format
Your solution should accept an input file (input.txt) with the following contents:

 Line 1: Two integers, N and K.
 Line 2: N positive integers of average home sale price, each less than 1,000,000.

Your solution will only be tested with valid input, according to the above constraints.
Output Format
Your solution should output one integer for each window’s result, with each integer on a separate line, to an output file or to the console.

Sample Input
5 3
188930 194123 201345 154243 154243
Sample Output
3
0
-1
Explanation
For the first window of [188930, 194123, 201345], there are 3 increasing subranges ([188930, 194123, 201345], [188930, 194123], and [194123, 201345]) and 0 decreasing, so the answer is 3. For the second window of [194123, 201345, 154243], there is 1 increasing subrange and 1 decreasing, so the answer is 0. For the third window of [201345, 154243, 154243], there is 1 decreasing subrange and 0 increasing, so the answer is -1.
Performance
Your solution should run in less than 10 seconds and use less than 50MB of memory with a valid input of any size (within the given constraints).
Specific technologies required: js or python or any other language
Extra notes:
Specific technologies required: js/ python/Any other
Extra notes: