2024 Day 3 (#73)

Author: JalonSolov

2024/03/JalonSolov.v

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+import regex
+import os
+
+instructions := os.read_file('instructions-part2.input')!
+
+mut mul_re := regex.regex_opt(r"(mul\(\d{1,3},\d{1,3}\))|(do(n't)?\(\))")!
+mut mul_total := 0
+mut enabled_total := 0
+
+mut enabled := true
+
+mut index := 0
+
+for index < instructions.len {
+	start, end := mul_re.find_from(instructions, index)
+	if start >= 0 {
+		group := instructions[start..end]
+		match group[0] {
+			`m` {
+				result := group[4..group.index(',')?].int() * group[group.index(',')? + 1..].int()
+				mul_total += result
+				if enabled {
+					enabled_total += result
+				}
+			}
+			`d` {
+				enabled = (group == 'do()')
+			}
+			else {
+				// should never happen
+			}
+		}
+		index = end
+	} else {
+		break
+	}
+}
+
+println('Part 1: ${mul_total}')
+println('Part 2: ${enabled_total}')

known/2024/03/JalonSolov.out

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+Part 1: 161
+Part 2: 48