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 Keycode (Posted on 2007-09-06)
Every day when Frank goes to work, he needs to enter a keycode with six different digits to get into the building. The front door has one keypad style and the back door has a different keypad style. One day, Frank realized that each digit in his keycode was horizontally, vertically or diagonally adjacent to the next digit on both keypads.

If the first digit of Frank's keycode is larger than the last, can you determine his keycode?

```    Front               Back
+---+---+---+   +---+---+---+---+---+
| 1 | 2 | 3 |   | 1 | 2 | 3 | 4 | 5 |
+---+---+---+   +---+---+---+---+---+
| 4 | 5 | 6 |   | 6 | 7 | 8 | 9 | 0 |
+---+---+---+   +---+---+---+---+---+
| 7 | 8 | 9 |
+---+---+---+
| 0 |
+---+
```
Example: 2,6 is a possible part of the keycode but 3,6 and 1,6 are not since those are adjacent on only one keypad.

 See The Solution Submitted by Brian Smith Rating: 3.6250 (8 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
 re: Solution | Comment 10 of 14 |
(In reply to Solution by K Sengupta)

The table as posted earlier was indeed erroneous, since the digits incorporated in the same stemmed from a misunderstanding of the fundamental tenets corresponding to the problem.

Accordingly, I confirm having amended the said table.

Edited on September 7, 2007, 9:41 am
 Posted by K Sengupta on 2007-09-07 09:40:40

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