Software Engineer

For a given a string(str), find and return the highest occurring character.

Example:

Input String: "abcdeapapqarr"
Expected Output: 'a'
Since 'a' has appeared four times in the string which happens to be the highest frequency character, the answer would be 'a'.

If there are two characters in the input string with the same frequency, return the character which comes first.

Consider:

Assume all the characters in the given string to be in lowercase always.

OOPs, Interface, Abstraction, and Collections

You have been given an array/list 'ARR' of integers. Your task is to find the second largest element present in the 'ARR'.

Note:

a) Duplicate elements may be present.

b) If no such element is present return -1.

Example:

Input: Given a sequence of five numbers 2, 4, 5, 6, 8.

Output:  6

Explanation:
In the given sequence of numbers, number 8 is the largest element, followed by number 6 which is the second-largest element. Hence we return number 6 which is the second-largest element in the sequence.

SQL VS NoSQL
MongoDB Aggregation Pipeline

You have given a sorted array 'A' of 'N' integers.

Now, you are given 'Q' queries, and each query consists of a single integer 'X'. Your task is to check whether 'X' is present in array 'A' or not for each query. If 'X' exists in array 'A', you need to print 1 else print 0.

Note :

The given array is sorted in non-decreasing order.