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Monday, February 2, 2015

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Fix Store App in Windows 8.1 - NoTime - Site Home - MSDN Blogs

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You'll Have To Think Like A Pirate To Solve This Week's Puzzle

You'll Have To Think Like A Pirate To Solve This Week's Puzzle


Pirates, of course, are notoriously greedy – but they're also incredibly shrewd. And don't forget, they'll kill you, if given the chance.


Sunday Puzzle #18: A Puzzle For Pirates


This week's puzzle was proposed by reader William Murray. It's a classic puzzle, and comes in a variety of forms, but the version I've included here was widely popularized in a 1999 in Ian Stewart's "Mathematical Recreations" column for Scientific American. The puzzle goes as follows:


Ten rational pirates have gotten their hands on a hoard of 100 gold pieces and wish to divide the loot. They are democratic pirates, in their own way, and it is their custom to make such divisions in the following manner: The fiercest pirate makes a proposal about the division, and everybody votes on it, including the proposer.


If 50 percent or more are in favor, the proposal passes and is implemented forthwith. Otherwise the proposer is thrown overboard, and the procedure is repeated with the next fiercest pirate.


All the pirates enjoy throwing one of their fellows overboard, but if given a choice they prefer cold, hard cash. They dislike being thrown overboard themselves. All pirates are rational and know that the other pirates are also rational. Moreover, no two pirates are equally fierce, so there is a precise pecking order-and it is known to them all. The gold pieces are indivisible, and arrangements to share pieces are not permitted, because no pirate trusts his fellows to stick to such an arrangement. It's every man for himself.


What proposal should the fiercest pirate make to get the most gold? For convenience, number the pirates in or­der of meekness, so that the least fierce is number 1, the next least fierce number 2 and so on. The fiercest pirate thus gets the biggest number, and proposals proceed in reverse order from the top down.




We'll be back next week with the solution – and a new puzzle! Got a great brainteaser, original or otherwise, that you'd like to see featured? E-mail me with your recommendations. (We welcome any and all submissions, but we're particularly interested in your picks for the most challenging Car Talk Puzzlers of all time – see the"Car Talk Puzzler Recommendations" section, below). As always, be sure to include "Sunday Puzzle" in the subject line!


Art by Tara Jacoby








SOLUTION To Sunday Puzzle #17: The Four-Glasses Puzzle


Last week, you were asked to arrange four glasses in the same orientation on four corners of a square Lazy Susan. You were challenged to accomplish this while adhering to a specific set of rules, and to do so within a finite number of turns.


Sighted, the puzzle is dead simple – but things get complicated when one is challenged to tackle the puzzle blindfolded. Several of you were quick to identify the crux of this puzzle: Because the arrangement of the four glasses is randomized after every turn, and because you are only permitted to inspect and adjust two glasses (positioned either across from or beside one another) between randomizing events, it is possible that one of the four glasses will go untouched, indefinitely. Commenter DarkClem3 did a good job summarizing the hangup:



Any time you switch from diagonal to adjacent or vise-versa you are guaranteed to have one of your selected glasses be one you checked on your previous turn and one different, but because of the random rotation you are not guaranteed which glass that will be. You will always be left with the possibility that that last untouched glass will elude you again.



At first glance, this situation seems to preclude the possibility that the glasses can be arranged in the same orientation in a finite number of turns – i.e. without relying on chance. But it doesn't! In fact, one can guarantee that the glasses are oriented in the same direction, in a maximum of just five turns.


Several of you arrived at the solution, but I believe the first to provide a clear explanation was Elephant1232. Here is that solution. I've made some minor edits for the sake of clarity, and included a couple sketches:



I believe I have a method that accomplishes the task in a maximum of five turns, with the possibility of accomplishing it in one, two, three or four if chance is on my side.


Go get your glasses. It's much easier that way.


1) Grab either of the diagonal pairs, and orient them both to the Up position. If the bell doesn't ring, you know the other diagonal pair is either Up/Down or Down/Down.


2a) After the table spins, grab a diagonal pair. If the glasses are Up/Down or Down/Down, you know they are not the same glasses you handled in step one. Simply orient them both to the Up position. The bell will ring.


2b) If you happen to grab the pair you originally handled, invert both glasses from the Up position into the Down position. If the bell doesn't ring, you can conclude that the pair you have yet to handle is oriented Up/Down. You therefore know that three of the four glasses are now oriented Down, with the last glass oriented Up:



You'll Have To Think Like A Pirate To Solve This Week's Puzzle



3a) The table spins. Grab any diagonal pair. If they are Up/Down, invert the Up glass into the Down position and the bell will ring.


3b) If the pair you grab is Down/Down, invert only one of the glasses to the Up position. There will now be two adjacent Ups and two adjacent Downs:



You'll Have To Think Like A Pirate To Solve This Week's Puzzle



4a) The table spins. Grab two adjacent glasses. If they are either Up/Up or Down/Down, simply invert both glasses to the opposite position. The bell will ring.


4b) If they glasses are positioned Up/Down, reverse the orientation of both. You will now have a pair of diagonal Ups, and a pair of diagonal Downs.



You'll Have To Think Like A Pirate To Solve This Week's Puzzle



5) The table spins. Grab any diagonal pair and invert the orientation of both. The bell will ring.



Notice that – in following steps 1, 2b, 3b, 4b, and 5 – one need not handle all the glasses to get all four into the same position. One only needs to handle three – which is doable, so longas one manipulate adjacent and diagonal glasses.


I will say Elephant 1232's was not the solution I was expecting. See, the I first place I encountered this puzzle was in the fourth chapter of Julian Havil's Nonplussed! Mathematical Proof of Implausible Ideas . Havil borrowed the puzzle from puzzle-legend Martin Gardner, who posed the puzzle back in 1979. Gardner, in turn, was told the puzzle by a man named Robert Tappay, "who believed it to have originated in Russia."


ANYWAY, Havil claims in his book that "an initial, important observation... is that the selection of the [glasses] has essentially two forms: a side pair or a diagonal pair." No complaints there. He then, however, claims that "it is also clear that these choices must alternate, otherwise we could go on repeating ourselves forever." The solution he provides is the same one I arrived at, the first time I tried my hand at this puzzle:



  1. Choose any diagonal pair and orient them to be the same way up.

  2. If the bell does not ring, spin the table and choose two adjacent glasses. If both are burned up, leave them. Otherwise, invert the glass that is turned down. If the bell doesn't ring, you know (as we did above) that three of the glasses are in the same orientation.

  3. Spin table and choose a diagonal pair of glasses. If one is turned down, invert it. The bell will ring. If both are turned up, invert one of them. As above, the resulting configuration is two adjacent Ups and two adjacent Downs.

  4. Spin the table. Select two adjacent glasses and invert them. If they were both oriented in the same position, the bell will ring. Otherwise, you will have a diagonal pair in the Up position and a diagonal pair in the Down position.

  5. Spin the table. Select a diagonal pair of glasses and invert them. The bell will ring.


Notice how, in Havil's solution, the choice between adjacent and diagonal pairs alternates? As far as I can tell, this is not actually necessary, as Elephant1232's solution demonstrates! (But feel free to e-mail me if this doesn't check out on your end.)


Havil goes on to explore some generalizations of the problem involving increasingly numerous glasses and increasingly numerous hands with which to manipulate them. It's too lengthy to include here, but if you're mathematically inclined, I encourage you to grab a copy for yourself.


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Cobra CDR 900 review

Believe it or not, there was once a time where every aspect of our lives was not recorded in some way. Shocking, I know.


Despite the criticisms of that type of progression, the ever-increasing presence of cameras in our lives does have real advantages.


Fender benders, natural disasters, street brawls, and YouTube-worthy comedic moments can now be documented from the comfort of your car, which can save you money, save you time, or simply add a few ‘likes’ to your Facebook page.


Cobra’s CDR 900 dash cam can help you do just that. With its 1080P/1296P capability, wireless video streaming, and 160-degree viewing angle, it’s a worthy ambassador to the top of its field.


Setup and shooting modes


Straight out of the box, the CDR 900 comes with everything you need: the camera, mounts, manual, 8 gigabyte Micro SD Card, and Micro USB cables for charging and data transfer.


The camera itself is small and streamlined, with a 2.0-inch LCD screen and two buttons to flip through the menu and shoot.


The CDR 900 has two filming modes: Dash Cam Mode and Action Cam Mode.


Dash Cam Mode will shoot a continuous loop from the moment it turns on, which overwrites old footage to make room for more. It does emergency videos as well.


The CDR 900 equips a built-in ‘G-Sensor,’ which is basically an accelerometer that measures impacts, sudden accelerations, and abrupt stops. When an event occurs, the camera automatically saves the 30 seconds of film immediately preceding and following it.


There’s usually a lot of hearsay during automobile accidents, so having HD video (and serviceable audio) to back up your claims could save you a big headache. Unfortunately (or fortunately, I guess), I didn’t have the chance to test this function. I swerved, launched, and stopped as fervently as I could, but I failed to trigger the emergency recording. For that, I am sorry.


Cobra-CDR-900-dash-cam-review-windsheild
Andrew Hard/Digital Trends

Cobra-CDR-900-dash-cam-review-windsheild-2
Andrew Hard/Digital Trends

The second ‘Action Cam Mode’ is for normal, straightforward shooting. Simply press the red button to begin and end recordings, and time-stamped files are saved to the card. It’s worth noting that the dash cam splits all video into three-minute segments to avoid substantial footage if the .mp4s become corrupted.


Once you’ve mounted the unit to your windshield, tightened down the locking rings, and paired the camera to the ‘Drive HD’ smartphone app (more on that in a bit), you’re ready to drive.


On-road performance


No matter the locale, light conditions, or time of day, the video quality was excellent for a product of this size.


Cobra includes an 8 GB Micro SD card with the $299.95 MSRP bundle (though it can be had for much less), which is good for 2.1 hours of footage at 1920×1080 resolution and 30 fps. For more storage, the camera accepts up to a 64 GB card that can hold up to 16.8 hours of video.


As far as recording on the go, Cobra’s interface is very simple. The LCD screen displays shooting mode, battery life, as well as date and time. The menu is a simple click-through setup, with options to turn on Wi-Fi, initiate Cloud connection, view and delete videos, toggle microphone, and adjust user settings.


A Micro USB plug connects the camera to your computer, and essentially functions like a flash drive. Simply click and drag the .mp4 files to your desktop. The plug also fits into the included 12V car charger. There are two more ports on the side for HDMI TV output and GPS input, however the remaining components are not included.


Smartphone connectivity


Ever wanted to live stream your arrest? Cobra’s ‘Drive HD’ iPhone and Android application can help you do that.


With the local connection, the CDR 900 sends a live video feed to your smartphone via onboard WiFi. There’s about a one-second delay between devices, but you can save clips and still images to your phone, and even control the camera remotely all secret-like.


cobra-drive-hd-app-2 cobra-drive-hd-app-3 cobra-drive-hd-app-4 cobra-drive-hd-app-5

You can also upload with the Cloud, which requires a wireless access point and allows you to view video with the app anywhere.


The program is easy to use, but, if I’m honest, it’s a tad shaky and slightly redundant. Sometimes it takes Drive HD a few attempts to recognize signals and log in. Once you’re connected, though, it seems solid. And hey, it’s free.


If you’ve read up on this product, you may have heard Cobra’s connections can sometimes overrun by other local signals. With that in mind, I tested it on an antiquated Motorola Droid 4 in several locations and had no issues with overlap.


Conclusion


HD dash cams fall into the category of things you didn’t know you wanted, but, after using one, now desperately need.


So whether you want video proof of an accident or hope to capture an alien abduction on film, an extra pair of eyes in your car can do a lot of good. If you’re looking for something that can record simply, in high quality, and doesn’t get in the way, Cobra’s CDR 900 is definitely worth a try.


Highs



  • Easy setup

  • High quality recordings

  • Simple smartphone pairing and app connectivity


Lows



  • Spendy

  • No built-in GPS






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