If we start with 5, valid numbers will be 55,54,52,56,58 (count: 5) If we start with 4, valid numbers will be 44,41,45,47 (count: 4) If we start with 3, valid numbers will be 33, 32, 36 (count: 3) If we start with 2, valid numbers will be 22, 21, 23,25 (count: 4) If we start with 1, valid numbers will be 11, 12, 14 (count: 3) If we start with 0, valid numbers will be 00, 08 (count: 2) Given a number N, find out the number of possible numbers of given length.įor N=1, number of possible numbers would be 10 (0, 1, 2, 3, …., 9)įor N=2, number of possible numbers would be 36 In case you wish to attend live classes with experts, please refer DSA Live Classes for Working Professionals and Competitive Programming Live for Students. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.
Print Postorder traversal from given Inorder and Preorder traversalsĪttention reader! Don’t stop learning now. Inorder Tree Traversal without recursion and without stack!. 
Inorder Tree Traversal without Recursion. Tree Traversals (Inorder, Preorder and Postorder). Breadth First Search or BFS for a Graph. Unique paths covering every non-obstacle block exactly once in a grid. 
Print all possible paths from top left to bottom right of a mXn matrix. Count all possible paths from top left to bottom right of a mXn matrix. Count number of ways to reach destination in a Maze. The Knight’s tour problem | Backtracking-1. Warnsdorff’s algorithm for Knight’s tour problem. Printing all solutions in N-Queen Problem. Rat in a Maze | Backtracking using Stack. Java ArrayList to print all possible words from phone digits. Print all possible words from phone digits. Closest Palindrome Number (absolute difference Is min). Given a number, find the next smallest palindrome. Next higher palindromic number using the same set of digits. ISRO CS Syllabus for Scientist/Engineer Exam. ISRO CS Original Papers and Official Keys. GATE CS Original Papers and Official Keys.
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