sir what is a &b in the comparator body??
and how the condition is (return a<=b)??
Money change problem
a and b are your array values, and a<=b is simply the condition we need to check.
You can see this link if you want to know how they work https://www.geeksforgeeks.org/comparator-class-in-c-with-examples/ or http://www.cplusplus.com/reference/algorithm/sort/
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