2017 Atlantic Canadian Preliminary Contest


2017-10-13 07:30 AKDT

2017 Atlantic Canadian Preliminary Contest


2017-10-13 12:30 AKDT
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Problem H
Slider Puzzle

Image by Scott Bateman, Used under license

A slider puzzle consists of a row of squares each of which contains a single digit integer, like the illustration.

A circle marker starts on the initial square on the left and can be moved to other squares along the row. At each step in the puzzle, you may only move the marker the number of squares indicated by the integer in the square it currently occupies, but it the marker can be moved either left or right along the row. The marker may not move past either end of the puzzle. For example, in the puzzle above the only legal first move is to move the marker three squares to the right because there is no room to move three spaces to the left.

The goal of the puzzle is to move the marker to the 0 at the far end of the row, on the right. However, not every puzzle has a valid solution.


Input for this problem will be a number between $1$ and $100$ inclusive representing the number of puzzles in the input, each puzzle is between $10$ and $101$ digits long. Each individual puzzle will be on one line and consist of a series of integers separated by spaces.


Output should simply state whether “Puzzle N is solvable.” or “Puzzle N is not solvable.” where $N$ refers to the puzzle instance.

Sample Input 1 Sample Output 1
3 6 4 1 3 4 2 5 3 0
3 2 1 1 1 2 2 5 3 0
Puzzle 1 is solvable.
Puzzle 2 is not solvable.