thegeneralist01/aoc
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day x

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TheGeneralist 2024-12-22 13:03:13 +01:00
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133
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const std = @import("std");
const in = @embedFile("in");
fn array_includes(comptime T: type, haystack: []T, needle: T) bool {
for (haystack) |item| {
if (item == needle) {
return true;
}
}
return false;
}
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const ally = gpa.allocator();
defer _ = gpa.deinit();
var lines = std.ArrayList(std.ArrayList(u32)).init(ally);
var incorrect_line_idxs = std.ArrayList(u32).init(ally);
defer {
for (lines.items) |*line| {
line.deinit();
}
lines.deinit();
incorrect_line_idxs.deinit();
}
var dependencies = std.AutoHashMap(u32, std.ArrayList(u32)).init(ally);
defer {
var iter = dependencies.iterator();
while (iter.next()) |entry| {
entry.value_ptr.deinit();
}
dependencies.deinit();
}
var in_lines = std.mem.tokenize(u8, in, "\n");
var parsing_dependencies = false;
var i: u32 = 0;
while (in_lines.next()) |line| {
if (std.mem.indexOf(u8, line, "|")) |_| {
parsing_dependencies = true;
} else {
parsing_dependencies = false;
}
if (line.len > 0 and parsing_dependencies) {
var dependance = std.mem.split(u8, line, "|");
const num1 = try std.fmt.parseInt(u32, dependance.next().?, 10);
const num2 = try std.fmt.parseInt(u32, dependance.next().?, 10);
var entry = try dependencies.getOrPut(num2);
if (!entry.found_existing) {
entry.value_ptr.* = std.ArrayList(u32).init(ally);
}
try entry.value_ptr.append(num1);
} else if (line.len > 0 and !parsing_dependencies) {
var ints = std.mem.split(u8, line, ",");
var intLine = std.ArrayList(u32).init(ally);
while (ints.next()) |int| {
try intLine.append(try std.fmt.parseInt(u32, int, 10));
}
try lines.append(intLine);
}
i += 1;
}
// Part 1
var middle_page_number_sum: u32 = 0;
for (lines.items, 0..) |line, lidx| {
var is_correct = true;
outer: for (line.items, 0..) |num1, j| {
for (line.items[0..j]) |num2| {
const deps = dependencies.get(num1);
if (deps == null) {
is_correct = false;
break :outer;
}
var found = false;
for (deps.?.items) |dep| {
if (dep == num2) {
found = true;
break;
}
}
if (!found) {
is_correct = false;
break :outer;
}
}
}
if (is_correct) {
middle_page_number_sum += line.items[line.items.len / 2];
} else {
try incorrect_line_idxs.append(@intCast(lidx));
}
}
std.debug.print("Part1: {}\n", .{middle_page_number_sum});
// Part 2
middle_page_number_sum = 0;
for (incorrect_line_idxs.items) |idx| {
const line = lines.items[idx];
var fixed_line = std.ArrayList(u32).init(ally);
defer fixed_line.deinit();
for (line.items) |num| {
const deps = dependencies.get(num);
if (deps == null) {
try fixed_line.insert(0, num);
continue;
}
var j: usize = 0;
for (fixed_line.items) |comparison_num| {
if (array_includes(u32, deps.?.items, comparison_num)) {
j += 1;
continue;
}
}
try fixed_line.insert(j, num);
}
middle_page_number_sum += fixed_line.items[fixed_line.items.len / 2];
}
std.debug.print("Part 2: {}\n", .{middle_page_number_sum});
}

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day5/in Normal file
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28
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47|53
97|13
97|61
97|47
75|29
61|13
75|53
29|13
97|29
53|29
61|53
97|53
61|29
47|13
75|47
97|75
47|61
75|61
47|29
75|13
53|13
75,47,61,53,29
97,61,53,29,13
75,29,13
75,97,47,61,53
61,13,29
97,13,75,29,47

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const std = @import("std");
const in = @embedFile("in");
const Direction = struct {
x: i32,
y: i32,
const Left = Direction{ .x = -1, .y = 0 };
const Right = Direction{ .x = 1, .y = 0 };
const Up = Direction{ .x = 0, .y = -1 };
const Down = Direction{ .x = 0, .y = 1 };
pub fn eql(self: Direction, other: Direction) bool {
return self.x == other.x and self.y == other.y;
}
};
fn array_includes(comptime T: type, haystack: []T, needle: T) bool {
for (haystack) |item| {
if (item == needle) {
return true;
}
}
return false;
}
fn turn_right(direction: Direction) Direction {
if (direction.eql(Direction.Up)) {
return Direction.Right;
} else if (direction.eql(Direction.Right)) {
return Direction.Down;
} else if (direction.eql(Direction.Down)) {
return Direction.Left;
} else if (direction.eql(Direction.Left)) {
return Direction.Up;
}
unreachable;
}
fn find_guard(lines: std.ArrayList(std.ArrayList(i8))) [2]i32 {
for (lines.items, 0..) |line, y| {
for (line.items, 0..) |item, x| {
if (item == 1) {
return .{ @intCast(x), @intCast(y) };
}
}
}
unreachable;
}
fn print_lines(lines: std.ArrayList(std.ArrayList(i8))) void {
for (lines.items) |line| {
for (line.items) |item| {
switch (item) {
-1 => std.debug.print("#", .{}),
0 => std.debug.print(".", .{}),
1 => std.debug.print("^", .{}),
2 => std.debug.print("V", .{}),
else => std.debug.print(" ", .{}),
}
}
std.debug.print("\n", .{});
}
}
fn count_visited(lines: std.ArrayList(std.ArrayList(i8))) u32 {
var count: u32 = 0;
for (lines.items) |line| {
for (line.items) |e| {
if (e == 2 or e == 1) count += 1;
}
}
return count;
}
fn move(lines: std.ArrayList(std.ArrayList(i8)), direction: Direction) void {
// print_lines(lines);
// std.debug.print("\n", .{});
const pos = find_guard(lines);
var x = pos[0];
var y = pos[1];
lines.items[@intCast(y)].items[@intCast(x)] = 2; // 2 for already visited
x += direction.x;
y += direction.y;
if (y < 0 or y >= lines.items.len or x < 0 or x >= lines.items[@intCast(y)].items.len) {
return;
}
if (lines.items[@intCast(y)].items[@intCast(x)] == -1) {
x -= direction.x;
y -= direction.y;
lines.items[@intCast(y)].items[@intCast(x)] = 1;
return move(lines, turn_right(direction));
}
lines.items[@intCast(y)].items[@intCast(x)] = 1;
return move(lines, direction);
}
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const ally = gpa.allocator();
defer _ = gpa.deinit();
var lines = std.ArrayList(std.ArrayList(i8)).init(ally);
defer {
for (lines.items) |*line| {
line.deinit();
}
lines.deinit();
}
var in_lines = std.mem.tokenize(u8, in, "\n");
while (in_lines.next()) |linestr| {
var line = std.ArrayList(i8).init(ally);
for (linestr) |c| {
const value: i8 = switch (c) {
'#' => -1,
'.' => 0,
'^' => 1,
else => -2,
};
try line.append(value);
}
try lines.append(line);
}
move(lines, Direction.Up);
const moves = count_visited(lines);
std.debug.print("{d}\n", .{moves});
}

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