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--- Part Two ---
The air conditioner comes online! Its cold air feels good for a while, but then the TEST alarms
start to go off. Since the air conditioner can't vent its heat anywhere but back into the
spacecraft, it's actually making the air inside the ship [1m[97mwarmer[0m.
Instead, you'll need to use the TEST to extend the thermal radiators. Fortunately, the diagnostic
program (your puzzle input) is already equipped for this. Unfortunately, your Intcode computer is
not.
Your computer is only missing a few opcodes:
- Opcode 5 is [1m[97mjump-if-true[0m: if the first parameter is [1m[97mnon-zero[0m, it sets the instruction pointer to
the value from the second parameter. Otherwise, it does nothing.
- Opcode 6 is [1m[97mjump-if-false[0m: if the first parameter [1m[97mis zero[0m, it sets the instruction pointer to the
value from the second parameter. Otherwise, it does nothing.
- Opcode 7 is [1m[97mless than[0m: if the first parameter is [1m[97mless than[0m the second parameter, it stores 1 in
the position given by the third parameter. Otherwise, it stores 0.
- Opcode 8 is [1m[97mequals[0m: if the first parameter is [1m[97mequal to[0m the second parameter, it stores 1 in the
position given by the third parameter. Otherwise, it stores 0.
Like all instructions, these instructions need to support [1m[97mparameter modes[0m as described above.
Normally, after an instruction is finished, the instruction pointer increases by the number of
values in that instruction. [1m[97mHowever[0m, if the instruction modifies the instruction pointer, that value
is used and the instruction pointer is [1m[97mnot automatically increased[0m.
For example, here are several programs that take one input, compare it to the value 8, and then
produce one output:
- 3,9,8,9,10,9,4,9,99,-1,8 - Using [1m[97mposition mode[0m, consider whether the input is [1m[97mequal to[0m 8; output
1 (if it is) or 0 (if it is not).
- 3,9,7,9,10,9,4,9,99,-1,8 - Using [1m[97mposition mode[0m, consider whether the input is [1m[97mless than[0m 8; output
1 (if it is) or 0 (if it is not).
- 3,3,1108,-1,8,3,4,3,99 - Using [1m[97mimmediate mode[0m, consider whether the input is [1m[97mequal to[0m 8; output 1
(if it is) or 0 (if it is not).
- 3,3,1107,-1,8,3,4,3,99 - Using [1m[97mimmediate mode[0m, consider whether the input is [1m[97mless than [0m8; output
1 (if it is) or 0 (if it is not).
Here are some jump tests that take an input, then output 0 if the input was zero or 1 if the input
was non-zero:
- 3,12,6,12,15,1,13,14,13,4,13,99,-1,0,1,9 (using [1m[97mposition mode[0m)
- 3,3,1105,-1,9,1101,0,0,12,4,12,99,1 (using [1m[97mimmediate mode[0m)
Here's a larger example:
3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99
The above example program uses an input instruction to ask for a single number. The program will
then output 999 if the input value is below 8, output 1000 if the input value is equal to 8, or
output 1001 if the input value is greater than 8.
This time, when the TEST diagnostic program runs its input instruction to get the ID of the system
to test, [1m[97mprovide it 5[0m, the ID for the ship's thermal radiator controller. This diagnostic test suite
only outputs one number, the [1m[97mdiagnostic code[0m.
[1m[97mWhat is the diagnostic code for system ID 5?[0m
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