Algorithm for ‘spreading` sum in Hash
Date : January 11 2021, 03:32 PM

I hope this helps you . This solution could be a starting point, I didn't test for avoiding infinite loop: banknotes = { 5 => 6, 10 => 7, 20 => 8, 50 => 9 }
amount = 335
min = banknotes.keys.min
init_avg = amount / banknotes.keys.sum # calculate the initial average
result = banknotes.transform_values { init_avg } # initialize with average
delta = amount  result.sum { k,v k * v }
if delta > 0 # start distribution
loop do
banknotes.keys.reverse_each do val
if delta  val >= 0 and result[val] + 1 < banknotes[val]
delta = val
result[val] += 1
end
end
break if delta < min
end
end
result
#=> {5=>3, 10=>4, 20=>4, 50=>4}
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