10+ EC-Council Interview Questions and Answers

Q1. LFU Cache Design Problem

Design and implement a Least Frequently Used (LFU) Cache with the following functionalities:

1. put(U__ID, value): Insert the value in the cache if the key ('U__ID') is not already pres...read more

Q2. Maximize the Sum Through Two Arrays

You are given two sorted arrays of distinct integers, ARR1 and ARR2. If there is a common element in both arrays, you can switch from one array to the other.

Your task is to ...read more

Q3. Find All Pairs Adding Up to Target

Given an array of integers ARR of length N and an integer Target, your task is to return all pairs of elements such that they add up to the Target.

Input:

The first line conta...read more

Q4. Convert a Binary Tree to a Sum Tree

Given a binary tree of integers, convert the binary tree into a sum tree where each node's value is replaced by the sum of the values of its left and right subtrees in the or...read more

Q5. Largest Rectangle in Histogram Problem Statement

You are given an array/list HEIGHTS of length N, where each element represents the height of a histogram bar. The width of each bar is considered to be 1.

Your t...read more

Q6. Reverse Doubly Linked List in Groups Problem

You are provided with a Doubly Linked List consisting of integers and a positive integer 'K', which represents the size of the group. Your task is to modify the link...read more

Q7. Number of Islands Problem Statement

You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in this ma...read more

Q8. Snake and Ladder Problem Statement

Given a Snake and Ladder Board with 'N' rows and 'N' columns filled with numbers from 1 to N*N starting from the bottom left of the board, and alternating direction each row, ...read more

Q9. Deletion In Doubly Linked List

You are given a Doubly Linked List with 'N' positive integers. Your task is to delete a node at a given position 'POS' in this linked list.

Input:

The first line of input specifie...read more

Q10. Can you explain polymorphism and provide examples of real-time and run-time polymorphism?

Q11. Write a SQL query to find the X percentile of students.