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-rw-r--r--2020/eighteen.nim76
-rw-r--r--2020/input/eighteen.txt373
2 files changed, 449 insertions, 0 deletions
diff --git a/2020/eighteen.nim b/2020/eighteen.nim
new file mode 100644
index 0000000..fe3b49c
--- /dev/null
+++ b/2020/eighteen.nim
@@ -0,0 +1,76 @@
+# Day Eighteen: Operation Order
+import std/[os, strutils]
+
+let input = paramStr(1).readFile().strip().split("\n")
+
+# cheese: add parenthesis and eval
+
+func evaluate(a, b: int, op: char): int =
+ if op == '+':
+ return a + b
+ elif op == '*':
+ return a * b
+ else:
+ debugEcho "this should never happen."
+ return -1
+
+var sum = 0
+for line in input:
+ var stack: seq[tuple[val: int, op: char]] = @[(0, '+')]
+ for c in line:
+ let last = stack.len - 1
+ if c == ' ':
+ discard
+ elif c == '+' or c == '*':
+ stack[last].op = c
+ elif c == '(':
+ stack.add((0, '+'))
+ elif c == ')':
+ stack[last-1] = (evaluate(stack[last-1].val, stack.pop.val, stack[last-1].op), '+')
+ else:
+ stack[last] = (evaluate(stack[last].val, parseInt($c), stack[last].op), ' ')
+ sum += stack[stack.len - 1].val
+echo sum
+
+func shunting(expression: string): string =
+ var stack: seq[char]
+ for t in expression:
+ if t == ' ':
+ discard
+ elif t == '+':
+ while stack.len > 0 and stack[stack.len-1] == '+':
+ result.add(stack.pop)
+ stack.add(t)
+ elif t == '*':
+ while stack.len > 0 and (stack[stack.len-1] == '+' or stack[stack.len-1] == '*'):
+ result.add(stack.pop)
+ stack.add(t)
+ elif t == '(':
+ stack.add(t)
+ elif t == ')':
+ while stack.len > 0 and stack[stack.len - 1] != '(':
+ result.add(stack.pop)
+ assert stack.pop == '('
+ else:
+ result.add(t)
+ while stack.len != 0:
+ result.add(stack.pop)
+
+func evaluate(expression: string): int =
+ var stack: seq[int]
+ for s in expression:
+ if s == ' ':
+ discard
+ elif s == '+':
+ stack.add(stack.pop + stack.pop)
+ elif s == '*':
+ stack.add(stack.pop * stack.pop)
+ else:
+ stack.add(parseInt($s))
+ assert stack.len == 1
+ return stack[0]
+
+sum = 0
+for line in input:
+ sum += evaluate(line.shunting())
+echo sum
diff --git a/2020/input/eighteen.txt b/2020/input/eighteen.txt
new file mode 100644
index 0000000..2ceeee9
--- /dev/null
+++ b/2020/input/eighteen.txt
@@ -0,0 +1,373 @@
+3 + 8
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