35 lines
722 B
Plaintext
35 lines
722 B
Plaintext
|
Day 18 Notes
|
||
|
|
|
||
|
|
+--------+
|
||
|
|
| Part 1 |
|
||
|
|
+--------+
|
||
|
|
|
||
|
|
$ elixir day18part1.exs
|
||
|
|
<will add later>
|
||
|
|
|
||
|
|
Thoughts:
|
||
|
|
Since the order of precedence is the same, we can walk the token list, building up a left operand
|
||
|
|
and operator as we go, then applying the operator as soon as we get the right operand. For groups,
|
||
|
|
use recursion to resolve the group, and push the result back onto the beginning of the token list.
|
||
|
|
|
||
|
|
|
||
|
|
+--------+
|
||
|
|
| Part 2 |
|
||
|
|
+--------+
|
||
|
|
|
||
|
|
$ elixir day18part2.exs
|
||
|
|
|
||
|
|
Thoughts:
|
||
|
|
|
||
|
|
Now the order of precedence is relevant, so can no longer just walk the token list, need to know the
|
||
|
|
full context.
|
||
|
|
Addition basically becomes implicit brackets.
|
||
|
|
Will do this part later.
|
||
|
|
|
||
|
|
|
||
|
|
+------------------+
|
||
|
|
| Overall Thoughts |
|
||
|
|
+------------------+
|
||
|
|
|
||
|
|
|