in the video why are hey substracting 1 in thelower_bound function cven after passing compare function as parameter
Money change problem!
@Shubham_helloworld
If u observe that
if u just write
lower_bound(arr,arr+n,key,compare)
without -1 then giving a money value which exists in the array
would return a wrong value
it returns the next greater value in the array
hence the -1 is required so that even 120 and 100 would give us answer 100
in case -1 is not written then 100 would give answer 120 because of the comparator
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