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2024 day 7, plus an optimised version

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tristan 2024-12-07 17:56:20 +00:00
parent 69be745c60
commit d9b2d7990b
6 changed files with 1267 additions and 17 deletions
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104
2024/06/solution.nix
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@ -128,4 +128,108 @@
annotated = chart |> annotatePath |> annotateObs |> chartToStr; annotated = chart |> annotatePath |> annotateObs |> chartToStr;
# FASTER!
startingObsMap = getObsMap chart;
getObsMap = let
findObs = lib.lists.findFirstIndex (b: b == "#") null;
in chart: chart
|> lib.imap0 (y: line: line
|> lib.imap0 (x: char: if char != "#" then null else {
right = if y + 1 >= height || x + 1 >= width then null else (chart
|> index (y + 1)
|> lib.sublist (x + 1) width
|> findObs
|> maybeAdd (x + 1)
);
left = if y < 1 || x <= 0 then null else (chart
|> index (y - 1)
|> lib.sublist 0 (x)
|> lib.reverseList
|> findObs
|> maybeSub (x - 1)
);
down = if x < 1 then null else (chart
|> lib.sublist (y + 1) (height)
|> map (index (x - 1))
|> findObs
|> maybeAdd (y + 1)
);
up = if x + 1 >= width then null else (searchUp (b: b == "#") {x = x + 1; y = y - 1;} chart);
})
)
;
maybe = f: b: if isNull b then null else f b;
maybeAdd = v: builtins.add v |> maybe;
maybeSub = v: builtins.sub v |> maybe;
searchUp = matcher: {x, y}: chart: chart
|> lib.sublist 0 (y + 1)
|> map (index (x))
|> lib.reverseList
|> lib.lists.findFirstIndex matcher null
|> maybeSub (y)
;
firstOb = {
y = searchUp (i: !isNull i) startingPos startingObsMap;
x = startingPos.x;
};
index2d = {x, y}: m: m |> index y |> index x;
lookRight = obsMap: prev: {
x = (index2d prev obsMap).right;
y = prev.y + 1;
};
lookDown = obsMap: prev: {
x = prev.x - 1;
y = (index2d prev obsMap).down;
};
lookLeft = obsMap: prev: {
x = (index2d prev obsMap).left;
y = prev.y - 1;
};
lookUp = obsMap: prev: {
x = prev.x + 1;
y = (index2d prev obsMap).up;
};
getNextDir = i: [lookRight lookDown lookLeft lookUp]
|> index (lib.mod i 4)
;
getFastpath = {i ? 0, pos ? firstOb, obsMap ? startingObsMap, hist ? []}: let
nextPos = (getNextDir i) obsMap pos;
newHist = hist ++ [point];
point = pos // {dir = lib.mod i 4;};
looped = lib.elem point hist;
in if isNull pos.x || isNull pos.y || looped
then {path = hist ++ [pos]; inherit looped;}
else getFastpath {i = i + 1; pos = nextPos; hist = newHist; inherit obsMap;}
;
fastpath = getFastpath {};
allObs = builtins.genList (i: {
x = lib.mod i width;
y = i / height;
}) (height * width)
|> builtins.filter (pos: index2d pos chart == ".")
|> map ({x, y}: replace2d {inherit x y;} "#" chart)
;
# this is a really slow way to do this, instead just find the adjacent columns and update accordingly
allMaps = allObs |> map getObsMap;
loopyMaps = allMaps
|> builtins.filter (m: (getFastpath {obsMap = m;}).looped);
part2faster = builtins.length loopyMaps;
} }

9
2024/07/example.txt Normal file
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@ -0,0 +1,9 @@
190: 10 19
3267: 81 40 27
83: 17 5
156: 15 6
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161011: 16 10 13
192: 17 8 14
21037: 9 7 18 13
292: 11 6 16 20

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2024/07/input.txt Normal file
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@ -0,0 +1,850 @@
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193
2024/07/solution.nix Normal file
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@ -0,0 +1,193 @@
{lib, ...}: input: rec {
index = i: arr: lib.elemAt arr i;
data = input
|> lib.trim
|> lib.splitString "\n"
|> map (line: line
|> lib.splitString ": "
|> (parts: {
target = index 0 parts |> lib.strings.toInt;
vals = parts
|> index 1
|> lib.splitString " "
|> map lib.strings.toInt;
})
)
;
/*
obvious answer:
try every combination of + and * between each number.
that is O(2^n)
I expect part 2 will introduce more operators, making this very slow.
slight optimisation idea:
all numbers in the input are positive integers.
if you multiply all numbers, and the result is less than the target,
it's not possible.
if the sum of all numbers is greater than the target, it's not possible.
but won't work where there are 1's in the list!
we could try going right to left and dividing and subtracting,
the complexity is the same though
*/
total = builtins.foldl' builtins.add 0;
multiply = builtins.foldl' builtins.mul 1;
isPossible = {target, vals, running ? null}:
let
nextVals = (lib.sublist 1 (builtins.length vals) vals);
in
if isNull running then isPossible {
inherit target;
running = (index 0 vals);
vals = nextVals;
} else let
val = index 0 vals;
sum = running + val;
multiple = running * val;
isEnd = builtins.length vals == 0;
in if isEnd then false else
if sum == target || multiple == target then true else
isPossible {
inherit target;
vals = nextVals;
running = sum;
} || isPossible {
inherit target;
vals = nextVals;
running = multiple;
}
;
part1result = data
# |> builtins.filter isInRange
|> builtins.filter isPossible
|> map (l: l.target)
|> total
;
/* Part 2
i had a feeling part 2 would introduce new operations.
this increases the complexity to O(3^n)
Really wish I went right to left now!
going right to left, we could check if the target ends in the running value
concat will always increase the value of a number.
concat will always increase the value more than multiplying.
*/
concat = a: b: lib.strings.toInt (toString a + toString b);
isPossible2 = {target, vals, running ? null}:
let
try = v: isPossible2 {
inherit target;
vals = (lib.sublist 1 (builtins.length vals) vals);
running = v;
};
val = index 0 vals;
in
if isNull running then try val else
if builtins.length vals == 0 then target == running else
if running > target then false else
let
sum = running + val;
multiple = running * val;
concatination = concat running val;
in
try sum || try multiple || try concatination;
part2result = data
|> builtins.filter isPossible2
|> map (l: l.target)
|> total
;
/*
lets try right to left
*/
isPossibleFast = ops: {target, vals, running ? target}:
(let
try = v: isPossibleFast ops {
inherit target;
running = v;
vals = (lib.sublist 0 (builtins.length vals - 1) vals);
};
val = index (builtins.length vals - 1) vals;
isFinal = builtins.length vals == 1;
in
builtins.any ({op, fin, check}: (
let vars = {inherit target running val isFinal; result = op vars;}; in (
if isFinal then fin vars else check vars && try vars.result
))) ops
);
isWhole = a: a == builtins.floor a;
toFloat = a: a * 1.0;
floatDiv = a: b: (toFloat a) / (toFloat b);
part1ops = [
{
op = {running, val, ...}: running - val;
check = {result, ...}: result > 0;
fin = {result, ...}: result == 0;
}
{
op = {running, val, ...}: floatDiv running val;
check = {result, ...}: isWhole result;
fin = {result, ...}: result == 1;
}
];
part1resultFast = data
|> builtins.filter (isPossibleFast part1ops)
|> map (l: l.target)
|> total
;
endsWith = a: b: let
full = intToString b;
end = intToString a;
endLen = builtins.stringLength end;
fullLen = builtins.stringLength full;
in endLen < fullLen && builtins.substring (fullLen - endLen) endLen full == end;
intToString = a: a |> builtins.floor |> toString;
intLength = a: a |> intToString |> builtins.stringLength;
truncate = a: amt: let
full = intToString a;
remLen = builtins.stringLength full - amt;
in if remLen <= 0 then 0 else builtins.substring 0 remLen full
|> lib.strings.toInt;
part2ops = part1ops ++ [
{
op = {running, val, ...}: truncate running (intLength val);
check = {running, val, ...}: endsWith val running;
fin = {target, val, result, ...}: (toString result) + (toString val) == toString target;
}
];
part2resultFast = data
|> builtins.filter (isPossibleFast part2ops)
|> map (l: l.target)
|> total
;
}

91
2024/07/solution.test.nix Normal file
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@ -0,0 +1,91 @@
{describe, it, ...}:
let
pkgs = import <nixpkgs> {};
solution = import ./solution.nix pkgs;
exampleInput = pkgs.lib.readFile ./example.txt;
example = solution exampleInput;
parsedExample = [
{target = 190; vals = [10 19];}
{target = 3267; vals = [ 81 40 27 ];}
{target = 83; vals = [ 17 5 ];}
{target = 156; vals = [ 15 6 ];}
{target = 7290; vals = [ 6 8 6 15 ];}
{target = 161011; vals = [ 16 10 13 ];}
{target = 192; vals = [ 17 8 14 ];}
{target = 21037; vals = [ 9 7 18 13 ];}
{target = 292; vals = [ 11 6 16 20 ];}
];
in [
(describe "part 1" [
(it "get's lines" {
actual = example.data;
expected = parsedExample;
})
(it "calculates sum of a list" {
actual = map example.total [
[1 1 1 1]
[1 2 3 4]
];
expected = [
4
10
];
})
(it "calculates mult of a list" {
actual = map example.multiply [
[1 1 1 1]
[1 2 3 4]
];
expected = [
1
24
];
})
(it "checks if a list is possible" {
actual = map example.isPossible parsedExample;
expected = [
true true false false false false false false true
];
})
(it "gets the correct result" {
actual = example.part1result;
expected = 3749;
})
])
(describe "part 2" [
(it "concats numbers" {
actual = example.concat 12 34;
expected = 1234;
})
(it "checks if a list is possible" {
actual = map example.isPossible2 parsedExample;
expected = [
true true false true true false true false true
];
})
])
(describe "faster" [
(it "checks number ends with" {
actual = example.endsWith 6 486 ;
expected = true;
})
(it "cuts end off number" {
actual = example.truncate 7515 2;
expected = 75;
})
(it "checks if a list is possible with add and mult" {
actual = map (example.isPossibleFast example.part1ops) parsedExample;
expected = [
true true false false false false false false true
];
})
(it "checks if a list is possible with concat" {
actual = map (example.isPossibleFast example.part2ops) parsedExample;
expected = [
true true false true true false true false true
];
})
])
]

37
2024/flake.nix
View file

@ -17,28 +17,31 @@
in { in {
example = (solution example); example = (solution example);
sample1 = (solution '' sample1 = (solution ''
.#.. .#.
.^#. ..#
.#..''); #^.
.#.'');
sample2 = (solution '' sample2 = (solution ''
.#...... .#....
........ ......
.....#.. .....#
#....... #.....
..#.#... ..#.#.
...^....''); ...^..'');
real = (solution input); real = (solution input);
}; };
packages.x86_64-linux.watch = tix.watch { day07 = let
cmd = '' solution = import ./07/solution.nix pkgs;
nix run .\#test --impure --extra-experimental-features pipe-operators example = (pkgs.lib.readFile ./07/example.txt);
''; input = (pkgs.lib.readFile ./07/input.txt);
in {
example = (solution example);
real = (solution input);
test = tix.run [
./07/solution.test.nix
];
}; };
packages.x86_64-linux.test = tix.run [
./solution.test.nix
];
}; };
} }