Java Programming – Design a data structure that supports insert, delete, search and getRandom in constant time
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The idea is to use a resizable array (ArrayList in Java, vector in C) together with hashing. Resizable arrays support insert in Θ(1)
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Hashing
11 posts
Java Programming – Count distinct elements in every window of size k
An Efficient Solution is to use the count of previous window, while sliding the window. The idea is to create a hash map that stores elements.
C++ Programming – Count distinct elements in every window of size k
An Efficient Solution is to use the count of previous window, while sliding the window. The idea is to create a hash map that stores elements.
Python Programming – Longest Consecutive Subsequence
One Solution is to first sort the array and find the longest subarray with consecutive elements. Time complexity of this solution is O(nLogn).
Java Programming – Longest Consecutive Subsequence
One Solution is to first sort the array and find the longest subarray with consecutive elements. Time complexity of this solution is O(nLogn).
C++ Programming – Union and Intersection of two Linked Lists
Given two Linked Lists, create union and intersection lists that contain union and intersection of the elements present in the given lists.
Union and Intersection of two Linked Lists
Given two Linked Lists, create union and intersection lists that contain union and intersection of the elements present in the given lists.
Python Programming – Binary Tree in Vertical Order Hashmap based Method
An efficient solution based on hash map is discussed. We need to check the Horizontal Distances from root for all nodes and two nodes have the same
C Programming – Union and Intersection of two Linked Lists
Given two Linked Lists, create union and intersection lists that contain union and intersection of the elements present in the given lists.
C++ Programming – Find whether an array is subset of another array
Given two arrays: arr1[0..m-1] and arr2[0..n-1]. Find whether arr2[] is a subset of arr1[] or not. Both the arrays are not in sorted order.
