In the maximum sum of 3 non-overlapping subarrays problem we have given an array nums of positive integers, find three non-overlapping subarrays of length k with a maximum sum, and return their starting indices. Example Input: nums[] = {1, 2, 1, 2, 6, 7, 5, 1} k = 2 Output: …
KMP(Knuth-Morris-Pratt) algorithm is used for pattern searching in a given string. We are given a string S and a pattern p, our goal is to determine whether or not the given pattern is present in the string. Example Input: S = “aaaab” p = “aab” Output: true Naive Approach The …
In the sudoku solver problem we have given a partially filled (9 x 9) sudoku, write a program to complete the puzzle. Sudoku must satisfy the following properties, Every number(1-9) must appear exactly once in a row and once in a column. Every number(1-9) must appear exactly once in a …
If we have performing addition on a given range of array whose element values updated any time. Then in that type of problem, we handle using a segment tree structure. Given an array a[] with n elements and you have to answer multiple queries, each of the queries is one …
In minimum cost to hire K workers problem, we have given N workers from which we want to hire exactly k workers to form a paid group. The i-th worker has a quality[i] and a minimum wage expectation wage[i]. Pay will be given to them according to the following rules: …
In the Trapping Rain Water LeetCode problem, we have given N non-negative integers representing an elevation map and the width of each bar is 1. We have to find the amount of water that can be trapped in the above structure. Example Let’s understand that by an example For the …
Merge K sorted linked lists problem is so famous as per the interview point of view. This question asks so many times in big companies like Google, Microsoft, Amazon, etc. As the name suggests we’ve been provided with k sorted linked lists. We have to merge them together into a …
Consider a binary search tree, two nodes of the tree have been swapped, design an algorithm to recover the binary search Tree. Example Consider the binary search tree given below whose two nodes have been swapped as input. Incorrect nodes on the BST are detected(highlighted) and then swapped to obtain …
In Find Median from the data Stream problem, we have given that integers are being read from a data stream. Find the median of all the elements read so far starting from the first integer till the last integer. Example Input 1: stream[ ] = {3,10,5,20,7,6} Output : 3 6.5 …
In the Regular Expression Matching problem we have given two strings one (let’s assume it x) consists of only lower case alphabets and second (let’s assume it y) consists of lower case alphabets with two special characters i.e, “.” and “*”. The task is to find whether the second string …