How to Delete Columns to Make Sorted Table?
We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, …
How to Check If a Integer is a Strobogrammatic Number?
A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The …
How to Find Pivot Index of Array?
Given an array of integers nums, write a method that returns the “pivot” index of this array. We define the pivot index as the index where the sum of …
The Image Flood Fill Algorithm (C++)
An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535). Given a coordinate (sr, sc) representing …
How to Clone a Graph in C++/Java using Depth First Search Algorithm? (Graph and HashMap)
March 18, 2019
algorithms, c / c++, coding exercise, data structure, DFS, java, recursive
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Given a reference of a node in a connected undirected graph, return a deep copy (clone) of the graph. Each node in the graph contains a val (int) and …
The Unique Morse Code Words Algorithm
International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: “a” maps to “.-“, “b” maps to “-…”, …