34. Which of the following statements is/are true? I. II. A. B. Given a rooted tree that includes nodes A and D, if node D is the parent of node A, then the height of node A is lower than that of node D. A null graph is an example of a forest. I only is true C. Both I and II are true D. Neither I nor II is true Il only is true

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Eight puzzle problem

The N-puzzle problem contains N tiles (N+1 including empty tiles) where the value of N can be 8, 15, 24, etc. The puzzle is divided into the square root of (N+1) rows and the square root of (N+1) columns. These problems have an initial state or configuration and a goal state or configuration. The puzzle can be solved by shifting the tiles one by one in the empty space. The objective is to place the numbers on the tiles to match the final state using the empty space. The other name for the N-puzzle problem is the sliding puzzle.