QuestionQuestion

def largest_sum(xs, x, y):
Description: Zig-zag through a two dimensional list of integers from some starting point until you reach one of the list's boundaries, computing the largest sum that you find along the way. X and Y represent the row and column position in xs of the first number to use in the sum. The zig-zag patten is made by limiting yourself to only looking at the number immediately on the right of (x,y) and the number immediately below (x,y) when figuring out which of those numbers yields the largest sum.
Parameters: xs, a 2D list of integers, x,y are the row and col position in xs Return value: an integer, the largest sum you can find from position (x,y)

Examples:
largest_sum([[1,2],[3,0]],0,0) → 4
largest_sum([[5,6,1],[2,3,3]],0,0) → 17
largest_sum([[0,7,5],[6,-1,4],[-5,5,2]],0,0) → 18
largest_sum([[0,7,5],[6,-1,4],[-5,5,2]],1,1) → 6

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def largest_sum(xs, x, y):
    # dim_1 and dim_2 are numbers of rows and columns (boundaries)
    dim_1 = len(xs)
    dim_2 = len(xs[0])
    # first we are resolving the case if x and y are less than boundaries
    if x < dim_1 and y < dim_2:
       left_move = xs[x][y] + largest_sum(xs, (x + 1), y) # left move where the x is increased...

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