Solutions is derived from two assumptions: 1. When recieving $20 bills, giving back $15 in change using one $5 and one $10 is preferable over three $5 because you will have more $5 bills left over 2. $5 bills are more valuable because they can be given back when the change is $5, $10, and $15 https://leetcode.com/problems/lemonade-change/discuss/295786/The-answer-why-greedy-is-correct-here
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