Rectangle Counting

#1

  1. Please explain the use of two for loops to traverse and why did we stop at one previous element from the last.

  2. What is the difference between doin “It+1” and “next(it)”

#2

hello @anindya-gupta

because the inner loop is always starting from one element next of outer loop. so to make sure that inner and outer loop stay valid we are stopping first loop at second last element.

it+1 we can do on linear stuctures like array or vector.
here set is implemented using tree which is not linear thats why we are using next function to get the next element

#3

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#4

why we are doing ans/2 in video, i think we don"t have to do it