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Byo
Canada211 Posts
Note I still don't know the answers. 2 People crash land on a planet (person A and B) and end up on 2 random points on the planet (sphere) Under the following assumptions, what is the quickest way in which person A should find person B 1) person B stands still 2) person B wants to find person A as well 3) person B does not want person A to find him.  | ||
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coolcrimefighter
United States378 Posts
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ShinyGerbil
Canada519 Posts
in 3), person B will just walk randomly, and so will person A... | ||
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Fontong
United States6454 Posts
2) I guess person A can call person B and they could meet up at a coffee shop or something 3) I guess A has to look for B | ||
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Zozma
United States1626 Posts
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Deleted User 3420
24492 Posts
Do they have any equipment? What is the terrain like? Is there light? Is there water? Have person A and B discussed a strategy for this situation beforehand? Are the 3 assumptions all combined into one question? Or are they 3 different scenarios ? | ||
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jeppew
Sweden471 Posts
in 2 and 3 they can miss eachother and wander around forever. | ||
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Byo
Canada211 Posts
I'm guessing 2) means that B will be moving in the same way as A... (they want to find each other)... but what that way is, i don't know. | ||
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Fontong
United States6454 Posts
And we seriously need an illustration -__- | ||
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Deleted User 3420
24492 Posts
On April 21 2009 11:09 Byo wrote: they are variables.......... ie. under 1) the answer is for A to move in a spiral motion so it takes the least amount of time to cover the surface of the sphere. ah so these problems are to be looked at mathematically then ? It would seem to me that 1, 2, and 3 all have the same answer. | ||
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Divinek
Canada4045 Posts
Under the following assumptions, what is the quickest way in which person A should find person B 3) person B does not want person A to find him. so shouldnt it be impossible if B is trying to hide from A? I mean yeah I guess he's standing still, but what is point of the third option then if he cant hide? | ||
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Byo
Canada211 Posts
On April 21 2009 11:13 Divinek wrote: so shouldnt it be impossible if B is trying to hide from A? I mean yeah I guess he's standing still, but what is point of the third option then if he cant hide? I believe its assumed that they have the same range of vision so if B sees A then A is able to see B | ||
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Byo
Canada211 Posts
On April 21 2009 11:13 travis wrote: ah so these problems are to be looked at mathematically then ? It would seem to me that 1, 2, and 3 all have the same answer. yup all mathematically... I'm sure they don't have the same answer...... | ||
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Mastermind
Canada7096 Posts
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sixghost
United States2096 Posts
On April 21 2009 11:13 Divinek wrote: so shouldnt it be impossible if B is trying to hide from A? I mean yeah I guess he's standing still, but what is point of the third option then if he cant hide? I think the difference in the 3rd problem is that you are supposed to assume that person B will move in a pattern that is not optimal for the two people to meet. | ||
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meeple
Canada10211 Posts
2) The fastest way to find a person is if they stand still. So see the above answer. The reason for this is because this method is guaranteed to end, there are a finite number of places on the sphere and if they stay in one, they will eventually be found, which is why this is the method that search ad rescue crews tell people. 3) Well, you only have two options, you can either stay still or move around pretty randomly, and since staying still means you will eventually be found, then keep moving, and if you're really lucky, you can always avoid the person, but generally speaking you will avoid them for much longer than staying in the same spot. | ||
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Deleted User 3420
24492 Posts
On April 21 2009 11:20 sixghost wrote: I think the difference in the 3rd problem is that you are supposed to assume that person B will move in a pattern that is not optimal for the two people to meet. but no such pattern exists when he doesn't know what pattern the other guy will take all moving does for person B is increase the variance in time it will take for person A to find him. It may make it faster, or it may make it slower. The average amount of time stays the same, no? | ||
Carnivorous Sheep
Baa?21244 Posts
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Deleted User 3420
24492 Posts
1.) person B knew where person A landed 2.) person B knew that person A would take a pattern that maximized his odds of finding person B | ||
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Athos
United States2484 Posts
If they both want to find each other than they will find each other. Hell, they may know something not mentioned. And yeah, this is not math. | ||
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