10+ RedSeer Consulting Interview Questions and Answers

Q1. Sum Queries in a Sorted Array

Given two arrays arr and queries, your task is to determine the sum of all elements in arr that are less than or equal to each element in queries. The array arr is provided in sort...read more

Q2. Minimum Character Deletion Problem Statement

You have been provided a string STR. Your task is to find and return the minimum number of characters that need to be deleted from STR so that each character's frequ...read more

Q3. Count Ways To Reach The N-th Stair Problem Statement

You are given a number of stairs, N. Starting at the 0th stair, you need to reach the Nth stair. Each time you can either climb one step or two steps. You ha...read more

Q4. Find The Sum Of The Left Leaves Problem Statement

Given a binary tree with ‘root’, your task is to find and return the sum of all the left leaf nodes.

Example:

Input:

1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1

Outpu...read more

Q5. Median of Two Sorted Arrays

Given two sorted arrays A and B of sizes N and M, find the median of the merged array formed by combining arrays A and B. If the total number of elements, N + M, is even, the median ...read more

Q6. Problem: Sort an Array of 0s, 1s, and 2s

Given an array/list ARR consisting of integers where each element is either 0, 1, or 2, your task is to sort this array in increasing order.

Input:

The input starts with...read more

Q7. Find K Closest Elements

Given a sorted array 'A' of length 'N', and two integers 'K' and 'X', your task is to find 'K' integers from the array closest to 'X'. If two integers are at the same distance, prefer th...read more

Q8. Next Greater Element Problem Statement

You are given an array arr of length N. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater element, ...read more

Q9. Reverse Only Letters Problem Statement

You are given a string S. The task is to reverse the letters of the string while keeping non-alphabet characters in their original position.

Example:

Input:

S = "a-bcd"

Ou...read more

Q10. Left View of a Binary Tree

Given a binary tree, your task is to print the left view of the tree. The left view of a binary tree contains the nodes visible when the tree is viewed from the left side.

Input:

The ...read more

Q11. Palindrome Checker Problem Statement

Given an alphabetical string S, determine whether it is a palindrome or not. A palindrome is a string that reads the same backward as forward.

Input:

The first line of the i...read more

Q12. Similar String Groups Problem Statement

Two strings S1 and S2 are considered similar if either S1 equals S2 or we can swap two letters of S1 at different positions so that it equals S2.

Input:

The first line of...read more

Q13. You will be given certain conditions for which you need to design a system. Can you explain your approach to low-level system design?