day 13 + 14

AdventOfCode2020.xcodeproj/project.pbxproj

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+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = 722B335UM5;
+				ENABLE_HARDENED_RUNTIME = YES;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		26E2ADE725873BBE00702405 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = 722B335UM5;
+				ENABLE_HARDENED_RUNTIME = YES;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
@@ -1323,6 +1491,24 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		26E2ADAF2586024700702405 /* Build configuration list for PBXNativeTarget "day13" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				26E2ADAD2586024700702405 /* Debug */,
+				26E2ADAE2586024700702405 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		26E2ADE525873BBE00702405 /* Build configuration list for PBXNativeTarget "day14" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				26E2ADE625873BBE00702405 /* Debug */,
+				26E2ADE725873BBE00702405 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 268D953125781DD80030EC4D /* Project object */;

common/Extensions.swift

@@ -24,3 +24,10 @@ extension String {
         return result
     }
 }
+
+extension Sequence {
+    func print(_ prefix: String = "") -> Self {
+        Swift.print(prefix, Array(self))
+        return self
+    }
+}

day13/main.swift

@@ -0,0 +1,61 @@
+import Foundation
+
+let input = loadData(day: 13)
+
+
+let scanner = Scanner(string: input)
+
+let startTime = scanner.scanInt()!
+
+var busLines: [(Int, position: Int)] = []
+
+var position = 0
+repeat {
+    if let line = scanner.scanInt() {
+        busLines.append((line, position))
+    } else if scanner.string("x") {
+        // Ignore
+    }
+    position += 1
+} while scanner.string(",")
+
+let min = busLines
+    .map { $0.0 }
+    .map { ((startTime / $0) * $0 + $0, $0) }
+    .print()
+    .min(by: { $0.0 < $1.0 })!
+
+
+print((min.0 - startTime) * min.1)
+
+let max = busLines.max(by: { $0.0 < $1.0 })!
+print(max)
+
+/*
+ brute force - takes too long
+
+var s = sequence(first: 0, next: { $0 + max.0 })
+    .lazy
+    .filter { t in busLines.allSatisfy { (t - max.position + $0.position).isMultiple(of: $0.0 )} }
+    .makeIterator()
+
+print(s.next())
+
+*/
+
+var step = 0
+var time = 0
+
+outer: while true {
+    time += step
+
+    step = 1
+    for (bus, position) in busLines {
+        guard (time + position).isMultiple(of: bus) else { continue outer }
+        step *= bus
+    }
+
+    break
+}
+
+print("part2", time)

day14/main.swift

@@ -0,0 +1,92 @@
+import Foundation
+let scanner = Scanner(string: loadData(day: 14))
+
+
+var maskBits: UInt64 = 0
+var maskUsed: UInt64 = 0
+
+
+var mem: [UInt64:UInt64] = [:]
+
+
+func readMask(_ mask: String) {
+    assert(mask.count == 36)
+
+    maskBits = 0
+    maskUsed = 0
+
+    for char in mask {
+        maskBits <<= 1
+        maskUsed <<= 1
+
+        switch char {
+        case "1": maskBits |= 1
+        case "0": break
+        case "X": maskUsed |= 1
+        default: assertionFailure("Invalid character in mask")
+        }
+    }
+}
+
+func applyMask(_ value: UInt64) -> UInt64 {
+    (value & maskUsed) | maskBits
+}
+
+let maskSet = CharacterSet(charactersIn: "01X")
+
+/*
+while !scanner.isAtEnd {
+    if scanner.string("mask = "), let mask = scanner.scanCharacters(from: maskSet) {
+        readMask(mask)
+    } else if scanner.string("mem["), let addr = scanner.scanInt(), scanner.string("] = "), let value = scanner.scanUInt64() {
+        mem[addr] = applyMask(value)
+    } else {
+        assertionFailure("Invalid input")
+    }
+}
+ */
+
+
+func printPadded(_ val: UInt64) {
+    let s = String(val, radix: 2)
+    print(String(repeating: " ", count: 36 - s.count) + s)
+}
+
+func possibleValues(_ mask: UInt64) -> [UInt64] {
+    var values: [UInt64] = []
+    var mask = mask
+    for i in 0..<36 {
+        if mask & 1 != 0 {
+            let bit: UInt64 = 1 << i
+            if values.isEmpty {
+                values.append(0)
+                values.append(bit)
+            } else {
+                values.append(contentsOf: values.map { $0 | bit })
+            }
+        }
+        mask >>= 1
+    }
+
+    return values
+}
+
+func writeMem(_ addr: UInt64, _ value: UInt64) {
+    for i in possibleValues(maskUsed) {
+        let effective = i | ((addr | maskBits) & ~maskUsed)
+        mem[effective] = value
+    }
+}
+
+while !scanner.isAtEnd {
+    if scanner.string("mask = "), let mask = scanner.scanCharacters(from: maskSet) {
+        readMask(mask)
+    } else if scanner.string("mem["), let addr = scanner.scanUInt64(), scanner.string("] = "), let value = scanner.scanUInt64() {
+        writeMem(addr, value)
+    } else {
+        assertionFailure("Invalid input")
+    }
+}
+
+
+print("sum", mem.values.reduce(0, +))