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RKCIPL Interview Questions and Answers
Q1. Maximum Subarray Sum Problem Statement
Given an array arr
of length N
consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation:
A sub...read more
Find the sum of the subarray with the maximum sum among all subarrays in a given array.
Iterate through the array and keep track of the maximum sum subarray seen so far.
Use Kadane's algorithm to efficiently find the maximum subarray sum.
Consider the case where all elements in the array are negative.
Handle the case where the array contains only one element.
Q2. Flipping Coins Problem
Gary has N coins placed in a straight line. Some coins have their head side up, and others have the tail side up.
Convention:
1 denotes the HEAD side is up.
0 denotes the TAIL side is up....read more
Find the maximum number of head-side up coins by flipping a continuous segment of coins.
Iterate through the array and calculate the maximum number of head-side up coins without flipping.
Iterate through the array and calculate the maximum number of head-side up coins after flipping a continuous segment.
Compare the results from the above two steps to find the maximum number of head-side up coins obtainable.
Q3. First Missing Positive Problem Statement
You are provided with an integer array ARR
of length 'N'. Your objective is to determine the first missing positive integer using linear time and constant space. This me...read more
Find the smallest positive integer missing from an array of integers.
Iterate through the array and mark positive integers as visited by changing the sign of the corresponding index.
After marking, iterate again to find the first positive integer with a positive value, which will be the smallest missing positive integer.
Handle edge cases like all negative numbers, duplicates, and missing 1 separately.
Q4. Problem: kth Missing Element in a Sequence
Given a strictly increasing sequence of integers VEC
, identify the Kth
missing contiguous integer element that is not present in the sequence, starting from the leftmo...read more
Find the kth missing element in a sequence of integers.
Iterate through the sequence to find missing elements.
Keep track of the count of missing elements found.
Return the kth missing element once count reaches k.
Q5. Find the Longest Palindromic Substring
Given a string ‘S’ composed of lowercase English letters, your task is to identify the longest palindromic substring within ‘S’.
If there are multiple longest palindromic ...read more
Find the longest palindromic substring in a given string, returning the rightmost one if multiple substrings are of the same length.
Iterate through each character in the string and expand around it to check for palindromes
Keep track of the longest palindromic substring found so far
Return the rightmost longest palindromic substring
Q6. Merge Sort Problem Statement
You are given a sequence of numbers, ARR
. Your task is to return a sorted sequence of ARR
in non-descending order using the Merge Sort algorithm.
Explanation:
The Merge Sort algorit...read more
Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.
Divide the input array into two halves recursively until each array has only one element.
Merge the sorted halves to produce a completely sorted array.
Time complexity of Merge Sort is O(n log n).
Example: Input: [3, 1, 4, 1, 5], Output: [1, 1, 3, 4, 5]
Join tables on employee ID, filter by balance less than 200, select employee names.
Join tables on employee ID attribute
Filter rows where balance is less than 200
Select employee names from the result
Q8. Difference between tuple and delete command
Tuple is a data structure that stores a fixed number of elements, while delete command is used to remove data from a database table.
Tuple is used to store multiple values in a single variable, while delete command is used to remove specific rows from a database table.
Tuples are immutable, meaning their values cannot be changed once they are set, while delete command permanently removes data from a table.
Example: Tuple (1, 'apple', 3.14) vs. DELETE FROM table_name WHERE condit...read more
Q9. Sql query on 2nd highest salary
Use SQL query with ORDER BY and LIMIT to find the 2nd highest salary.
Use ORDER BY clause to sort salaries in descending order
Use LIMIT 1,1 to skip the first highest salary and get the second highest salary
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