You are given an array of n integers which has integers from 1 to n. Some elements can be repeated multiple times and some other elements can be absent from the array. Write a program that takes O(1) space apart from the input array and O(n) time to print which elements are not present in the array and the count of every element which is there in the array with the element number.
1.find all numbers in a list that occurs odd times. 2.validate BST
Basic OOP and data structure questions
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First section involved, some kind of mathematical logic and puzzle. Second section was about write up the appropriate code for the storage goods using tree ADT. I had to actually write up codes and explain my approach in the blank page.
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