Knowledge 1

 ^ - Bitwise exclusive or 

returns false when both are false and both are true.

returns true only if one of the operand is true.

https://leetcode.com/problems/single-number/description/

solution using bitwise

types of heap

    - min heap

    - max heap

In min heap root element is the minimum in the heap. same for max i.e. it is the maximum in heap.