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day 13 + 14

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This commit is contained in:
Sven Weidauer 2020-12-14 18:49:31 +01:00
parent 1f9aae4f16
commit db394f7e14
4 changed files with 372 additions and 26 deletions
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238
AdventOfCode2020.xcodeproj/project.pbxproj
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26E2ACED257ED09000702405 /* Scanner+Extensions.swift in Sources */, 26E2ACED257ED09000702405 /* Extensions.swift in Sources */,
26E2ACD8257ECFFA00702405 /* main.swift in Sources */, 26E2ACD8257ECFFA00702405 /* main.swift in Sources */,
26E2AD422581713A00702405 /* LoadData.swift in Sources */, 26E2AD422581713A00702405 /* LoadData.swift in Sources */,
); );
@ -785,7 +889,7 @@
isa = PBXSourcesBuildPhase; isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647; buildActionMask = 2147483647;
files = ( files = (
26E2AD0A25800A1400702405 /* Scanner+Extensions.swift in Sources */, 26E2AD0A25800A1400702405 /* Extensions.swift in Sources */,
26E2ACFD258009FE00702405 /* main.swift in Sources */, 26E2ACFD258009FE00702405 /* main.swift in Sources */,
26E2AD432581713A00702405 /* LoadData.swift in Sources */, 26E2AD432581713A00702405 /* LoadData.swift in Sources */,
); );
@ -795,7 +899,7 @@
isa = PBXSourcesBuildPhase; isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647; buildActionMask = 2147483647;
files = ( files = (
26E2AD2F25816EE700702405 /* Scanner+Extensions.swift in Sources */, 26E2AD2F25816EE700702405 /* Extensions.swift in Sources */,
26E2AD2125816EE100702405 /* main.swift in Sources */, 26E2AD2125816EE100702405 /* main.swift in Sources */,
26E2AD442581713A00702405 /* LoadData.swift in Sources */, 26E2AD442581713A00702405 /* LoadData.swift in Sources */,
); );
@ -805,7 +909,7 @@
isa = PBXSourcesBuildPhase; isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647; buildActionMask = 2147483647;
files = ( files = (
26E2AD65258343E300702405 /* Scanner+Extensions.swift in Sources */, 26E2AD65258343E300702405 /* Extensions.swift in Sources */,
26E2AD56258343D800702405 /* main.swift in Sources */, 26E2AD56258343D800702405 /* main.swift in Sources */,
26E2AD71258343E600702405 /* LoadData.swift in Sources */, 26E2AD71258343E600702405 /* LoadData.swift in Sources */,
); );
@ -815,12 +919,32 @@
isa = PBXSourcesBuildPhase; isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647; buildActionMask = 2147483647;
files = ( files = (
26E2AD942584A63300702405 /* Scanner+Extensions.swift in Sources */, 26E2AD942584A63300702405 /* Extensions.swift in Sources */,
26E2AD842584A61F00702405 /* main.swift in Sources */, 26E2AD842584A61F00702405 /* main.swift in Sources */,
26E2AD952584A63300702405 /* LoadData.swift in Sources */, 26E2AD952584A63300702405 /* LoadData.swift in Sources */,
); );
runOnlyForDeploymentPostprocessing = 0; runOnlyForDeploymentPostprocessing = 0;
}; };
26E2ADA52586024700702405 /* Sources */ = {
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
files = (
26E2ADAC2586024700702405 /* main.swift in Sources */,
26E2ADBD2586025000702405 /* LoadData.swift in Sources */,
26E2ADBE2586025000702405 /* Extensions.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
26E2ADDD25873BBD00702405 /* Sources */ = {
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
files = (
26E2ADE425873BBE00702405 /* main.swift in Sources */,
26E2ADF625873BCB00702405 /* Extensions.swift in Sources */,
26E2ADF725873BCB00702405 /* LoadData.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
/* End PBXSourcesBuildPhase section */ /* End PBXSourcesBuildPhase section */
/* Begin XCBuildConfiguration section */ /* Begin XCBuildConfiguration section */
@ -1203,6 +1327,50 @@
}; };
name = Release; name = Release;
}; };
26E2ADAD2586024700702405 /* Debug */ = {
isa = XCBuildConfiguration;
buildSettings = {
CODE_SIGN_STYLE = Automatic;
DEVELOPMENT_TEAM = 722B335UM5;
ENABLE_HARDENED_RUNTIME = YES;
PRODUCT_NAME = "$(TARGET_NAME)";
SWIFT_VERSION = 5.0;
};
name = Debug;
};
26E2ADAE2586024700702405 /* Release */ = {
isa = XCBuildConfiguration;
buildSettings = {
CODE_SIGN_STYLE = Automatic;
DEVELOPMENT_TEAM = 722B335UM5;
ENABLE_HARDENED_RUNTIME = YES;
PRODUCT_NAME = "$(TARGET_NAME)";
SWIFT_VERSION = 5.0;
};
name = Release;
};
26E2ADE625873BBE00702405 /* Debug */ = {
isa = XCBuildConfiguration;
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 */ /* End XCBuildConfiguration section */
/* Begin XCConfigurationList section */ /* Begin XCConfigurationList section */
@ -1323,6 +1491,24 @@
defaultConfigurationIsVisible = 0; defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release; 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 */ /* End XCConfigurationList section */
}; };
rootObject = 268D953125781DD80030EC4D /* Project object */; rootObject = 268D953125781DD80030EC4D /* Project object */;

7
common/Scanner+Extensions.swift → common/Extensions.swift
View file

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

61
day13/main.swift Normal file
View file

@ -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)

92
day14/main.swift Normal file
View file

@ -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, +))