CareerCup

Implement BST Iterator and use them in 2 sum and 3 sums problem on a BST

Implement a rate limiter that multiple threads can use, while the global rate is limited to a value

Implement a thread-safe data structure which can keep track of number of incoming
requests grouped by IP Address over a time window. Add support for grouping by other
attributes such as BrowserAgent.

Given an array sort even element 
and odd number and such 
that even element at even index and
 odd at odd and you have 
to return minimum no of swap 
and it has should be sorted 
input 2134
output 1

Given a string select two non-overlapping strings that are same and remove them. Perform this operation recursively till there are no desired strings.
Print the number of possible substring after completing above operation.
Ex - abcc
Duplicate non-overlapping substring - abc
After removing abc from we are left with 1 substring abc.