diff options
| -rw-r--r-- | 2020/eighteen.nim | 76 | ||||
| -rw-r--r-- | 2020/input/eighteen.txt | 373 |
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 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