## Backtracking – SUDOKU Solver

SUDOKU Puzzle : The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called “boxes”, “blocks”,...

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SUDOKU Puzzle : The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called “boxes”, “blocks”,...

Objective: A child is climbing up a staircase with n steps, and can hop either 1 step, 2 steps, or 3 steps at a time. Implement a method to count how many possible ways...

Objective: Given a amount ‘A’ and n coins, v1<v2<v3<………..<vn . Write a program to find out minimum numbers of coins required to make the change for the amount ‘A’. Example: Amount: 5 Coins []...

Objective: Given k sorted array, write an algorithm to merge Them into One sorted array. Example : int[][] A = new int[5][]; A[0] = new int[] { 1, 5, 8, 9 }; A[1] =...

Objective: Given a array of integers, in which every elements occurs even number of times except one number which occurs add number of times. Find out that number. Example: int[] A = {...

Objective: – Given a binary tree, write an algorithm to find the diameter of the tree. What is Diameter Of a Tree: Diameter of tree is defined as A longest path or route between...

Objective: Given a sorted array of distinct integers, Find the Magic index or Fixed point in the array. Magic Index or Fixed Point: Magic index or a Fixed point in an array is an...

Objective: Given a range of integers, find all the numbers which are palindrome when they are represented in Decimal Value( base 10) and in Octal value(base 8). Example : Number : 373 (Decimal) and...

Objective: Write an algorithm to Print All the Well Ordered Permutations of a Given String. What is Well Ordered String: When all the alphabets in a string occur in the increasing order irrespective of...

Objective: Given an integer array A[1..n], find an instance of i,j,k where 0 < i < j < k <= n and A[i] < A[j] < A[k]. Example : int arrA[] = { 10,...

Objective: Given a number, find out whether its colorful or not. Colorful Number: When in a given number, product of every digit of a sub-sequence are different. That number is called Colorful Number. See...

Objective: Given a set of numbers, print all the posssible subsets of it including empty set. Power Set: In mathematics, PowerSet of any given set S, PS(S) is set of all subsets of S...

Objective: – Given “n”, generate all valid parenthesis strings of length “2n”. Example: Given n=2 Output: (()) ()() Approach:

Objective: We know that Queue is FIFO (First-in-First-Out) and Stack is LIFO ( Last-in-First-Out). Here our objective is to implement queue using stacks. Approach: Take 2 Stacks, stack1 and stack2. stack1 will be used...

Objective: Given a Linked List, Sort it using merge sort. Example: ->9->3->4->2->5->1 Sorted List: ->1->2->3->4->5->9 Approach: Reference : Merge Sort in array As it Merge sort, we apply the same logic , Divide and...

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