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Assignment 1: Solvability of the NxN sliding
tile puzzle
The sliding tile puzzle is a game that requires you to move tiles on a board. The board is NxN,
and there are N-1 tiles numbered from 1..N-1 that occupy the board. There is hence 1 location on
the board that is empty (referred to as a blank).
There is some (arbitrary) start configuration of the numbered tiles on the board. Starting with this
configuration, the aim is to move tiles until some chosen goal configuration is reached, and to do
this in the least possible number of moves. You may only move a tile into the blank if the tile
neighbours the blank. Moves can be only be in the horizontal and vertical directions (not
diagonal).
The sliding-tile puzzle also has other names, such as the 8 Puzzle (for the special case of a 3x3
board) or 15 Puzzle (a 4x4 board) and so on. Sometimes the name N Puzzle is used (indicating an
NxN board).
You can play the game online at:
sliding-tile puzzle
In this assignment you are asked to write a C program that determines whether a given puzzle is
solvable. (Note that you do not have to actually solve the puzzle.)
boardADT留学生作业代做、代写c/c++程序设计作业、代做Untitled Wiki作业
There are some conditions that you should strictly adhere to:
1. the program reads text from stdin with a format described below (we will be auto-testing
your program with our input so you must conform to this format)
2. your program should be able to handle any sized board, starting with 2x2
note that the size of the board is determined by the number of tiles on the input
3. if the input is correct and the goal configuration is:
reachable from the start configuration, your program should generate the output text
solvable (to stdout)
not reachable from the start configuration, your program should generate the output
text unsolvable (to stdout)
09/06/2019 Assignment1 - Untitled Wiki
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4. if the input is not correct, your program should generate an error message (to stdout)
5. if a system call fails in your program, the program should generate an error message (to
stderr)
6. design and programming restrictions:
you are not allowed to use any arrays
you are not allowed to use linked lists/trees/graphs
you should use an ADT to represent the board and operations on the board
Input format
Two lines of text on stdin specifies the start and goal configurations, read from left to right, top to
bottom. Each line consists of a sequence of integers, separated by any number (>0) of blanks
and/or tabs, that represent the tile numbers, and a single letter b to represent the blank space on
the board. These integers should of course be in the range 1..N-1 where the board is of size NxN.
The first line specifies the start board, the second line the goal board. For example:
9 12 5 4 2 b 7 11 3 6 10 13 14 1 8 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 b 15
represents a sliding-tile puzzle on a 4x4 board with the tiles initially placed on the board as shown
in the image at the top of page. The goal configuration has the tiles ordered row by row.
In the case of incorrect input
Checking the correctness of each configuration is vital. For example, an input line may not
represent an NxN board, or the blank may be missing, or one or more of the tile numbers 1..N
may be missing, or the 2 boards may not be the same size or the input contains something other
than a number or b. There may be more possibilities.
If the configuration is erroneous, your program must generate an appropriate error message (to
stdout). Note that it is possible to have more than one error, and in that case you only need to
generate a single error message. For example, consider the configuration 1 2 b 1. There are 2
errors in this configuration: the tile 3 is missing, and the tile 1 is duplicated. It does not matter
which error is detected by your program, just as long as the error is correct. When an error is
detected and reported, your program should exit gracefully, with status EXIT_FAILURE. The text
you use in error messages should be informative, but please keep it brief.
In the case of correct input
If the input is correct, the program should write the following 3 lines to stdout:
the text start: followed by the start configuration
the text goal: followed by the goal configuration
the text solvable or unsolvable as appropriate
The output for the 4x4 game above is for example:
start: 9 12 5 4 2 b 7 11 3 6 10 13 14 1 8 15
goal: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 b 15
solvable
The output for a game on a 2x2 board that happens to be unsolvable is:
09/06/2019 Assignment1 - Untitled Wiki
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Assignment1 (2019-06-08 17:12:33由AlbertNymeyer编辑)
start: 2 1 3 b
goal: 1 2 3 b
unsolvable
If the input is correct the program should exit with EXIT_SUCCESS.
Design
You should make an ADT to implement the puzzle. The client, which is the main program, calls
functions in the ADT to read the input, check for correctness and determine solvability. The
interface between the client and the ADT is a header file.
Marking
Marks will be deducted if you fail any of our tests for incorrect input, or incorrectly determine the
solvability of the puzzle. Marks will also be deducted for poor design (e.g. not using an ADT),
poor programming practice or violating any of the rules above.
The assignment is worth 10 marks.
Submission
You should submit exactly 4 files:
1. a Makefile that generates the executable puzzle (you should use the dcc compiler)
2. the C source code of the ADT (call it boardADT.c)
3. the header file of the ADT (boardADT.h)
4. the main program (puzzle.c)
To submit the assignment, use the command:
~cs9024/bin/classrun -give assign1 Makefile boardADT.c boardADT.h
puzzle.c
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