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Tank draining (Posted on 2013-10-14) Difficulty: 3 of 5
We have 16 tanks in a 4x4 grid.
+--+--+--+--+
|1 |2 |3 |4 |
+--+--+--+--+
|5 |6 |7 |8 |
+--+--+--+--+
|9 |10|11|12|
+--+--+--+--+
|13|14|15|16|
+--+--+--+--+
All the tanks are empty, except the first one, which is filled. We'd like to drain it. If you drain the water outside of the tank system, certain baby animals will be very sad, but draining the water from one tank to another is alright.

There is a door between each pair of adjacent tanks (but no diagonal connections). If you open the door between two tanks, the water levels will instantaneously equalize. What's the most you can drain out of the first tank?

See The Solution Submitted by Tristan    
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Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: More improvementTristan2013-10-15 00:14:54
More improvementJyqm2013-10-14 21:21:19
Not complicatedLarry2013-10-14 19:18:54
and another tiny improvement.Steve Herman2013-10-14 18:26:40
much more complexSteve Herman2013-10-14 17:56:43
Some Thoughtsmore complex than it seems at first glanceCharlie2013-10-14 17:29:43
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