Compare function

#1

not understand the compare part and how this compare function works.

#2

hey @dev sort function generally takes two parameters , the first one being the point of the array/vector from where the sorting needs to begin and the second parameter being the length up to which we want the array/vector to get sorted. The third parameter is optional and can be used in cases where custom sorting is needed as per need.
It is used to specify the order in which elements are to be sorted(known as comparator function)
This “comparator” function returns a value; convertible to bool, which basically tells us whether the passed “first” argument should be placed before the passed “second” argument or not.
For eg: In the code below, suppose intervals {6,8} and {1,9} are passed as arguments in the function(comparator function). Now as i1.first (=6) > i2.first (=1), so our function returns “false”, which tells us that “first” argument should not be placed before “second” argument and so sorting will be done in order like {1,9} first and then {6,8} as next.

#3

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