Code in Java. Explain with comments.

Given an array "points" of numbers, a score can be calculated for a subarray [i....j] by...score = min(points[i...j])*sum(points[i...j[)

return the sum of all scores of all possible subarrays.

For example, points = [2,1,3] in the form index pair = score 0,0 = 4 0,1 = 3 0,2 = 6 1,1 = 1 1,2 = 4 2,2 = 9

total = 25