When we use comparator then why we return a>b.
As for descending it should be a<b.Means to say that if a will be less than b than only swap as we want sorted array in descending order.
STL Inbuilt Sort function
the comparator works exactly opposite of what you assumed.
the trick to remember it is that:
if a<b then a should come before b, so return true ( this will create array sorted in ascending order)
else return false
if a>b then a should come before b, so return true ( this will create array sorted in descending order)
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