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#!/usr/bin/swift
import Foundation
guard CommandLine.arguments.count >= 2 else {
fatalError("Usage: ./Day_01 <input.txt>")
}
let moves = try! String(contentsOfFile: CommandLine.arguments[1], encoding: .utf8)
.split(separator: "\n")
.compactMap { line in
guard let first = line.first,
let magnitude = Int(line[line.index(after: line.startIndex)...])
else { fatalError("L13 : [ERROR] Failed to read magnitude error") }
let sign = (first == "R" ? 1 : -1)
return sign * magnitude
}
var dialValue = 50
var count = 0
for move in moves {
dialValue = ((dialValue + move) % 100 + 100) % 100
if dialValue == 0 {
count += 1
}
}
print("=======Part 1=======\n\(count)")
dialValue = 50
count = 0
for move in moves {
let magnitude = abs(move)
let effectivePosition = move > 0 ? dialValue : (100 - dialValue) % 100
count += (effectivePosition + magnitude - 1) / 100
dialValue = ((dialValue + move) % 100 + 100) % 100
if dialValue == 0 {
count += 1
}
}
print("=======Part 2=======\n\(count)")
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