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6
Heretic + Hexen Release Notes
Az önce
THE 1 GAMER
2
storage cracker problems
Az önce
tonym1972
I just needed to quickly check where storage cracker was in relation to some other challenges...

The first thing you might want to look at is your ALU. You have 3 control lines, but only 6 functions.... maybe adding an extra 2 functions such as a left/right shift might make your life easier.

Shifting left is the equivalent of multiplying by a power of 2, shifting right is dividing by a power of 2. so 32 << 2 == 128.

The ""efficient"" algorithm the game wants you to stumble across is known as a binary chop search, in pseudo code it looks something like this...

bottom = 0;
top = 0 - 1; a dirty way to make 255
while not found
temp = top - bottom; find size of our search range
temp = temp >> 1; half the search range
guess = top - temp; subtract from the top, to find the midpoint
send guess
if guess too large
top = guess
else
bottom = guess
loop

And this post should end here, EXCEPT the level has a ""gotcha"".

If you connect a counter to the output, and just spam numbers, the level does seem to randomly pick a code....
BUT if the level spots that your using a binary chop search, it'll take advantage of the fact that a naive implementation cannot generate a valid guess at either end of the search range... so using the code as is would generate....
128
64
32
16
8
4
2
1
As valid guesses, then continuously be stuck sending 1 as a valid guess... the level when it spots a binary chop search sets the code as 0 (we will exploit this in a moment!).

So we need to add the following....
if top == 1
send 0
if bottom == 254
send 255

Now lets exploit this....
guess = 32 << 2
while forever
send guess
guess = guess >> 1
loop

Hope that helps.
0
无尽的冒险 v1.2.8 更新日志
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