111 lines
3.6 KiB
Swift
111 lines
3.6 KiB
Swift
#if !hasFeature(Embedded)
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import Foundation
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#endif
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@main
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struct Day02 {
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static func run() {
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print("Parsing...")
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let parsed = parseInput(realInput)
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print("Running Part 1...")
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part1(parsed)
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print("Running Part 2...")
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part2(parsed)
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print("Finished!")
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}
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typealias ParsedInput = [(UInt64, UInt64)]
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static func parseInput(_ input: String) -> ParsedInput {
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input.split(separator: ",")
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//.filter({ line in
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// let split = line.split(separator: "-")
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// return String(split[0]).count % 2 == 0 || String(split[1]).count % 2 == 0
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//})
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.map({ line in
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let split = line.split(separator: "-")
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return (UInt64(split.first!)!, UInt64(split.last!)!)
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})
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}
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static func part1(_ input: ParsedInput) {
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var sum: UInt64 = 0
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for (lhs, rhs) in input {
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for cur in lhs...rhs {
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let cnt = String(cur).count
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guard cnt % 2 == 0 else { continue }
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let low = cur % UInt64(pow(10, (Double(cnt) / 2)))
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let hi = low * UInt64(pow(10, (Double(cnt) / 2)))
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if cur == hi + low {
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sum += cur
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}
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}
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}
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print("Part 1: \(sum)")
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}
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static func part2(_ input: ParsedInput) {
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var sum: UInt64 = 0
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for (lhs, rhs) in input {
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for cur in lhs...rhs {
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let sCur = String(cur)
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let cnt = sCur.count
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guard cnt > 1 else { continue }
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nextLength: for checkOffset in 0...((cnt / 2) - 1) {
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let sub = sCur[sCur.startIndex...sCur.index(sCur.startIndex, offsetBy: checkOffset)]
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for windowOffset in stride(from: sub.count, to: cnt, by: sub.count) {
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guard windowOffset + (sub.count) <= cnt else { break nextLength }
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let winStartIdx = sCur.index(sCur.startIndex, offsetBy: windowOffset)
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let winEndIdx = sCur.index(winStartIdx, offsetBy: sub.count - 1)
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let window = sCur[winStartIdx...winEndIdx]
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if sub != window {
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continue nextLength
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}
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}
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sum += cur
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break
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}
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}
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}
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print("Part 2: \(sum)")
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}
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#if hasFeature(Embedded)
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static func main() {
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gfxInitDefault()
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consoleInit(GFX_TOP, nil)
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run()
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while aptMainLoop() {
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hidScanInput()
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let kDown = hidKeysDown()
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if kDown & KEY_START != 0 {
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break
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}
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gfxFlushBuffers()
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gfxSwapBuffers()
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}
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gfxExit()
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}
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#else
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static func main() {
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run()
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}
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#endif
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}
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let testInput = """
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11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
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"""
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let realInput = """
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492410748-492568208,246-390,49-90,16-33,142410-276301,54304-107961,12792-24543,3434259704-3434457648,848156-886303,152-223,1303-1870,8400386-8519049,89742532-89811632,535853-567216,6608885-6724046,1985013826-1985207678,585591-731454,1-13,12067202-12233567,6533-10235,6259999-6321337,908315-972306,831-1296,406-824,769293-785465,3862-5652,26439-45395,95-136,747698990-747770821,984992-1022864,34-47,360832-469125,277865-333851,2281-3344,2841977-2953689,29330524-29523460
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"""
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