sir I do not understand how the comparator is working
((return a<=b)) ??
and what is the value a and b in the comparator function declaration ??
Money change problem
when you sort a array
then to sort a array
we have to swap element and before swapping we check the element whether we have to swap or not according to comparator function
a and b are the elements of array
return a<=b
means we have to return true if a is less than equal to b
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