Alpha Software Mobile Development Tools:   Alpha Anywhere    |   Alpha TransForm subscribe to our YouTube Channel  Follow Us on LinkedIn  Follow Us on Twitter  Follow Us on Facebook

Announcement

Collapse

The Alpha Software Forum Participation Guidelines

The Alpha Software Forum is a free forum created for Alpha Software Developer Community to ask for help, exchange ideas, and share solutions. Alpha Software strives to create an environment where all members of the community can feel safe to participate. In order to ensure the Alpha Software Forum is a place where all feel welcome, forum participants are expected to behave as follows:
  • Be professional in your conduct
  • Be kind to others
  • Be constructive when giving feedback
  • Be open to new ideas and suggestions
  • Stay on topic


Be sure all comments and threads you post are respectful. Posts that contain any of the following content will be considered a violation of your agreement as a member of the Alpha Software Forum Community and will be moderated:
  • Spam.
  • Vulgar language.
  • Quotes from private conversations without permission, including pricing and other sales related discussions.
  • Personal attacks, insults, or subtle put-downs.
  • Harassment, bullying, threatening, mocking, shaming, or deriding anyone.
  • Sexist, racist, homophobic, transphobic, ableist, or otherwise discriminatory jokes and language.
  • Sexually explicit or violent material, links, or language.
  • Pirated, hacked, or copyright-infringing material.
  • Encouraging of others to engage in the above behaviors.


If a thread or post is found to contain any of the content outlined above, a moderator may choose to take one of the following actions:
  • Remove the Post or Thread - the content is removed from the forum.
  • Place the User in Moderation - all posts and new threads must be approved by a moderator before they are posted.
  • Temporarily Ban the User - user is banned from forum for a period of time.
  • Permanently Ban the User - user is permanently banned from the forum.


Moderators may also rename posts and threads if they are too generic or do not property reflect the content.

Moderators may move threads if they have been posted in the incorrect forum.

Threads/Posts questioning specific moderator decisions or actions (such as "why was a user banned?") are not allowed and will be removed.

The owners of Alpha Software Corporation (Forum Owner) reserve the right to remove, edit, move, or close any thread for any reason; or ban any forum member without notice, reason, or explanation.

Community members are encouraged to click the "Report Post" icon in the lower left of a given post if they feel the post is in violation of the rules. This will alert the Moderators to take a look.

Alpha Software Corporation may amend the guidelines from time to time and may also vary the procedures it sets out where appropriate in a particular case. Your agreement to comply with the guidelines will be deemed agreement to any changes to it.



Bonus TIPS for Successful Posting

Try a Search First
It is highly recommended that a Search be done on your topic before posting, as many questions have been answered in prior posts. As with any search engine, the shorter the search term, the more "hits" will be returned, but the more specific the search term is, the greater the relevance of those "hits". Searching for "table" might well return every message on the board while "tablesum" would greatly restrict the number of messages returned.

When you do post
First, make sure you are posting your question in the correct forum. For example, if you post an issue regarding Desktop applications on the Mobile & Browser Applications board , not only will your question not be seen by the appropriate audience, it may also be removed or relocated.

The more detail you provide about your problem or question, the more likely someone is to understand your request and be able to help. A sample database with a minimum of records (and its support files, zipped together) will make it much easier to diagnose issues with your application. Screen shots of error messages are especially helpful.

When explaining how to reproduce your problem, please be as detailed as possible. Describe every step, click-by-click and keypress-by-keypress. Otherwise when others try to duplicate your problem, they may do something slightly different and end up with different results.

A note about attachments
You may only attach one file to each message. Attachment file size is limited to 2MB. If you need to include several files, you may do so by zipping them into a single archive.

If you forgot to attach your files to your post, please do NOT create a new thread. Instead, reply to your original message and attach the file there.

When attaching screen shots, it is best to attach an image file (.BMP, .JPG, .GIF, .PNG, etc.) or a zip file of several images, as opposed to a Word document containing the screen shots. Because Word documents are prone to viruses, many message board users will not open your Word file, therefore limiting their ability to help you.

Similarly, if you are uploading a zipped archive, you should simply create a .ZIP file and not a self-extracting .EXE as many users will not run your EXE file.
See more
See less

Programming Puzzle 25 - The Great Escape

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Re: Programming Puzzle 25 - The Great Escape

    gandhi,

    No problem. That's why they're called "puzzles" !

    Have fun sorting it out.

    -- tom

    Comment


    • #17
      Re: Programming Puzzle 25 - The Great Escape

      okay tom
      here is the corrected one

      Code:
      dim x as n
      dim cell[100] as c
      for x=1 to 100
      	cell[x]="locked"
      	next x
      dim guard as n
      dim doorNumber as n
      
      	for doorNumber = 1 to 100 'guard will visit all the doors
      		for guard = 1 to 100
      		
      			if mod(doorNumber,guard)=0 then ' but enter only few
      				if cell[doorNumber]="locked" then 
      				    cell[doorNumber]="open"
      				    else
      				    cell[doorNumber]="locked"
      				end if
      			end if
      		next 
      	next 
      		
      dim count as n
      trace.clear()
      for i = 1 to 100
      	if cell[i]="open"
      		trace.writeln("Cell number "+ i +" was left open")
      		count = count+1
      	end if
      next
      trace.writeln("Total of "+count+" prisoners will escape")
      'msgbox("Open cells",str(count))
      end
      thanks for reading

      gandhi

      version 11 3381 - 4096
      mysql backend
      http://www.alphawebprogramming.blogspot.com
      ggandhi344@gmail.com
      Skype:ggandhi344@gmail.com
      1 914 924 5171

      Comment


      • #18
        Re: Programming Puzzle 25 - The Great Escape

        gandhi,

        Nice!

        -- tom

        Comment


        • #19
          Re: Programming Puzzle 25 - The Great Escape

          And, here's Tom's solution.

          I used a For ... Next code block with a variable STEP parameter to do the heavy lifting.

          Comments? Questions? Corrections?

          Comment


          • #20
            Re: Programming Puzzle 25 - The Great Escape

            Code:
            if cells[x] = 0 then
            	cells[x] = 1
            else
            	cells[x] = 0	
            end if
            I believe all three solutions used something similar to this if..else.. end if.

            This could have shortened saving a assignment of the value 0 (locked) to the cell array element. In other words, if the cell is already locked why relock it?

            Code:
            if cells[x] = 0 then
            	cells[x] = 1
            end if
            Andrew

            Comment


            • #21
              Re: Programming Puzzle 25 - The Great Escape

              Andrew, I don't understand your point. I must be missing something. The puzzle specifies that each guard must either open or close (lock or unlock) each cell door he or she visits.

              Comment


              • #22
                Re: Programming Puzzle 25 - The Great Escape

                Professor:

                My simple, uncommented code:

                Code:
                dim cellblock[100] as l
                for g = 1 to 100
                	for c = 1 to 100 step g
                		cellblock[c] = iif(cellblock[c], .f., .t.)
                	next c
                next g
                for c = 1 to 100
                	iif(cellblock[c],trace.writeln(c+": Open"),"")
                next c
                and with my comments:

                Code:
                'All cellblocks are locked by default (.f.):
                dim cellblock[100] as l
                'work through each of the 100 guards:
                for g = 1 to 100
                	'visiting each of the 100 cellblocks:
                	for c = 1 to 100 step g
                		'unlocking, if locked, and vice versa:
                		cellblock[c] = iif(cellblock[c], .f., .t.)
                	'visiting the next cellblock:
                	next c
                'moving on to the next guard:
                next g
                'checking all 100 cellblocks:
                for c = 1 to 100
                	'tracing out only the unlocked cells:
                	iif(cellblock[c],trace.writeln(c+": Open"),"")
                next c
                In the end, I had nine cellblocks open:

                2: Open
                5: Open
                10: Open
                17: Open
                26: Open
                37: Open
                50: Open
                65: Open
                82: Open

                Ah, but what if the guards each started, not at cellblock 1, but cellblock N:

                Code:
                'All cellblocks are locked by default (.f.):
                dim cellblock[100] as l
                'work through each of the 100 guards:
                for g = 1 to 100
                	'visiting each of the 100 cellblocks:   ***** Note that each guard starts at cellblock N *****
                	for c = g to 100 step g
                		'unlocking, if locked, and vice versa:
                		cellblock[c] = iif(cellblock[c], .f., .t.)
                	'visiting the next cellblock:
                	next c
                'moving on to the next guard:
                next g
                'checking all 100 cellblocks:
                for c = 1 to 100
                	'tracing out only the unlocked cells:
                	iif(cellblock[c],trace.writeln(c+": Open"),"")
                next c
                Now we end up with ten cellblocks open:

                1: Open
                4: Open
                9: Open
                16: Open
                25: Open
                36: Open
                49: Open
                64: Open
                81: Open
                100: Open
                Stephen Pilon
                Associate Librarian
                Christendom College

                Comment


                • #23
                  Re: Programming Puzzle 25 - The Great Escape

                  Professor,

                  By the way, I didn't look at your result until after I took the test.
                  Stephen Pilon
                  Associate Librarian
                  Christendom College

                  Comment


                  • #24
                    Re: Programming Puzzle 25 - The Great Escape

                    Stephen,

                    Very nice! The "professor" likes your second solution. Good work. Hope you enjoyed the exercise!

                    Comment

                    Working...
                    X