# Tower of hanoi solutions

For the other disks there is always one possibility, except when all disks are on the same peg, but in that case either it is the smallest disk that must be moved or the objective has already been achieved. Disk six is 0, so it is on another peg. A proof that uses this way of thinking is an example of the principle of induction.

Move the smallest disk to the peg it has not recently come from.

Solve the problem for N-1 disks, assuming rod 2 as the destination, and rod 3 as the spare rod. It consists of three pegs and a number of discs of decreasing sizes. That is to say: So, since we know how to move the tower of height 2 — that was easy — we now have a way of moving a tower of height 3, then of height 4, and then height 5, etc, etc.

When counting the moves starting from 1, the ordinal of the disk to be moved during move m is the number of times m can be divided by 2. Whether it is left or right is determined by this rule: This method involves the use of the principles of mathematical induction and recurrence relations.

Best done by always holding the top disc with the same hand and always moving that hand in the same direction. Disk four is 1, so it is on another peg.

The topmost small triangle now represents the one-move possibilities with two disks: This provides the following algorithm, which is easier, carried out by hand, than the recursive algorithm.

Let Nh be the number of non-self-crossing paths for moving a tower of h disks from one peg to another one. Select the number of disks and click start to see how it is resolved. This chain goes on forever and so any tower, no matter how tall, can be moved without breaking the rules.

Its solution touches on two important topics discussed later on: The proof just described gives a recipe for moving a tower of height n.

The puzzle is well known to students of Computer Science since it appears in virtually any introductory text on data structures or algorithms.

If yes, then why does this prove that the puzzle can be solved for any number of discs? Assume that the initial peg is on the left.

At this point in time all the remaining disks will have to be stacked in decreasing size order on Aux. We are given a tower of eight disks initially four in the applet belowinitially stacked in increasing size on one of three pegs.

Disks seven and eight are also 0, so they are stacked on top of it, on the left peg. The edge in the middle of the sides of the largest triangle represents a move of the largest disk.

Tower of hanoi solutions one counts in Gray code of a bit size equal to the number of disks in a particular Tower of Hanoi, begins at zero, and counts up, then the bit changed each move corresponds to the disk to move, where the least-significant bit is the smallest disk, and the most-significant bit is the largest.

Counting moves from 1 and identifying the disks by numbers starting from 0 in order of increasing size, the ordinal of the disk to be moved during move m is the number of times m can be divided by 2. After moving the bottom disk from Src to Dst these disks will have to be moved from Aux to Dst.

Hence all disks are on the final peg and the puzzle is complete. The largest disk is 0, so it is on the left initial peg.

Above is a unique application that shows you exactly how the puzzle is solved including the number of moves. The nodes at the vertices of the outermost triangle represent distributions with all disks on the same peg.The tower of Hanoi (commonly also known as the "towers of Hanoi"), is a puzzle invented by E.

Lucas in It is also known as the Tower of Brahma puzzle and appeared as an intelligence test for apes in the film Rise of the Planet of the Apes () under the name "Lucas Tower." Given a stack of. The Tower of Hanoi (also called the Tower of Brahma or Lucas’ Tower, and sometimes pluralized) is a mathematical game or puzzle.

tower of hanoi It consists of three rods, and a number of disks of different sizes which can slide onto any rod. Solving the Towers of Hanoi problem with one disk is trivial, and it requires moving only the one disk one time. How about two disks?

How do you solve the problem when n = 2 n = 2 n = 2 n, equals, 2? The Tower of Hanoi is a puzzle popularized in by Edouard Lucas, a French scientist famous for his study of the Fibonacci sequence. However, this puzzle's roots are from an ancient legend of a Hindu temple.

The recursive solution of Tower of Hanoi works analogously - only different part is to really get not lost with B and C as were the full tower ends up.

share | improve this answer answered Aug 3 '09 at Different mathematical solutions.

There are a couple of mathematical ways to solve Tower of Hanoi and we cover two of these: The simple algorithmic solution: Though the original puzzle featured 64 disks, according to popular belief, the game can be played with any number of rings.

Mathematicians have come up with a simple algorithm that can .

Tower of hanoi solutions
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