Design Patterns
Design Patterns is general repeatable solution to a commonly occurring problem in software design. Rather we should call it a solution template as it will provide the standard to implement the solution not the code directly. In 1994, four authors Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides (known as Gang of Four) published a book […]
N Queen Problem Using Recursive Backtracking
N Queen Problem is the problem of placing N chess queens on an NxN chessboard so that no two queens attack each other, for which solutions exist for all natural numbers n except n=2 and n=3. A solution requires that no two queens share the same row, column, or diagonal. It is more general form of inital Eight queens problem, where we need to […]
Graph Search – Depth First Search
We discussed about basic search mechanisms for Graph and Breadth First Search(BFS) in previous article. In this article we will start with basic definition of the Depth First Search(DFS). Depth First Search(DFS): In depth first search, we start from the root node then traverse the graph layerwise until we reach the leaf or dead end. In short, One […]
Graph Search – Breadth First Search
In Our previous article about Graph, we have seen the different ways to represent the graph. we have a way to represent this unstructured data structure. Now question arise is how I will traverse through this given graph structure. There are main two methods which we will use to traverse through graph. Breadth First Search […]
Sudoku checker (By traversing each cell only once)
Sudoku is a logic-based combinatorial number-placement puzzle. Given a partially filled 9×9 2D array i.e. grid[9][9], the goal is to assign digits (from 1 to 9) to the empty cells so that every row, column, and subgrid of size 3×3 contains exactly one instance of the digits from 1 to 9. For Detailed understanding about Sudoku, […]
Snakes N Ladders | Java Program Implementation
Snakes N Ladders is an ancient Indian board game regarded today as a worldwide classic. It is played between two or more players on a gameboard having numbered, gridded squares. A number of "ladders" and "snakes" are pictured on the board, each connecting two specific board squares. The object of the game is to navigate one's game […]
Tic Tac Toe | Java Program Implementation
Tic Tac Toe (also known as Noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game. If you are interested in java […]
Stack Implementation Using Array
A stack is a container of objects that are inserted and removed according to the last-in first-out (LIFO) principle. A stack is a limited access data structure – elements can be added and removed from the stack only at the top. push operation adds an item to the top of the stack. pop removes the item from […]
Graph
Graph is a non linear data structure, it contains a set of points known as nodes (or vertices) and set of links known as edges which connects the vertices. The pictorial representation is shown in the image in the left pane. Types of Graph: Undirected Graph is a graph that is a set of vertices connected by edges, where the […]
Heap (Min/Max Heap)
What is heap? Heap is a balanced binary tree data strucure where the root-node key is compared with its children and arranged accordingly. Max Heap: Root element will always be greater than or equal to either of its child element( see the image on left pane). Min Heap: Root element will always be less than or equal […]
