Problem Statement Given an array a[ ] of size n. The problem “Find maximum difference between nearest left and right smaller elements” asks us to create a function. Such that it creates two arrays left[ ] and right[ ] representing nearest smaller element to the left and nearest smaller element …
Problem Statement You are given a string s of size n representing an arithmetic expression with parenthesis. The problem “Remove brackets from an algebraic string containing + and – operators” asks us to create a function that can simplify the given expression. Example s = “a-(b+c)” a-b-c s = a-(b-c-(d+e))-f a-b+c+d+e-f …
Problem Statement The problem “Implement a stack using single queue” asks us to implement a stack (LIFO) data structure using a queue (FIFO) data structure. Here LIFO means Last In First Out while FIFO means First In First Out. Example push(10) push(20) top() pop() push(30) pop() top() Top : 20 …
Problem Statement The problem “Check if two nodes are on the same path in a Tree” states that you are given a n-ary tree (directed acyclic graph) rooted at root node with uni-directional edges between it’s vertices. You are also given a list of queries q. Each query in list …
Problem Statement The problem “Check if all levels of two Binary Tree are anagrams or not” says that you are given two Binary Trees, check if all the levels of the two trees are anagrams or not. Examples Input true Input false Algorithm to Check if all levels of two …
Problem Statement The problem “Convert array into Zig-Zag fashion” states that you are given an – of integers. The problem statement asks to sort the array in a zig-zag manner such that the elements in the array will look like à a < b > c < d > e …
Problem Statement The problem “Iterative Postorder Traversal Using Two Stacks” states that you are given a binary tree with n nodes. Write the program for it’s iterative postorder traversal using two stacks. Example Input 4 5 2 6 7 3 1 Input 4 2 3 1 Algorithm Create …
Problem Statement The problem “Stack Permutations (Check if an array is stack permutation of other)” states that you are given two arrays a[ ] and b[ ] of size n. All the elements of the array are unique. Create a function to check if the given array b[ ] is …
Problem Statement You have given an array of integers. The problem “Rearrange array such that even index elements are smaller and odd index elements are greater” asks to rearrange the array in such a manner that the even index elements should be smaller than the odd index elements in a …
Problem Statement “Tracking current Maximum Element in a Stack” states that you are given a stack data structure. Create a function to keep the track of the maximum value in the stack till the current index. Example 4 19 7 14 20 4 19 19 19 20 Explanation: The maximum …