Didn't understand the code

#1

@ 4:48 the code shows that lb returns <=25 value(-1 index). But it’s returning 20 i.e. lb returns 50’s address. But how is it so as 50 is >25?

#2

@mitrapranav0027_5d705c8b616e0add
return a<=b in custom compare works like upper_bound(it returns the first value which is not less than or equal to searched value) so lower_bound function with this custom compare will give you value just greater than searched value and subtracting -1 will give you the correct denomination of that money that will be either less than or equals to searched money.

#3

Ohh ok. So Instead of that Can I use upper bound as it would find the term greater than(>) ?

#4

yeah you can use upper bound.

#5

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