Created
April 5, 2019 07:10
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ruby maximum hourglass sum
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def sum_hour_glass(c, r, two_d_array) | |
top = two_d_array[r][c..c+2].inject(:+) | |
center = two_d_array[r +1][c+1] | |
bottom = two_d_array[r+2][c..c+2].inject(:+) | |
top + center + bottom | |
end | |
def array2D(arr) | |
max = -1.0/0.0 | |
arr.each_with_index do |row, r_i| | |
break if r_i > 3 | |
row.each_with_index do |el, c_i| | |
next if c_i > 3 | |
sum = sum_hour_glass(c_i, r_i, arr) | |
max = sum if sum > max | |
end | |
end | |
max | |
end |
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