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day4. Getting the hang of it. Much more straight forward than yesterday. I was hoping I could get the arrays set up without an allocator.. I feel like you should be able to. The file is loaded at compile time so technically we should know the size of the arrays. Maybe a future project

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Dustin Swan 5 months ago
parent 54b84bb14a
commit 080ff61267
Signed by: dustinswan
GPG Key ID: AB49BD6B2B3A6377
3 changed files with 292 additions and 0 deletions
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196
day4/data.txt
Unescape Escape View File

@ -0,0 +1,196 @@
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Card 193: 92 52 87 63 59 77 79 38 8 96 | 70 72 26 8 49 51 39 53 94 42 55 44 65 78 34 66 41 11 82 56 12 88 33 23 95
Card 194: 49 19 18 28 94 70 6 34 24 43 | 98 91 99 46 66 20 31 80 88 61 90 56 8 73 92 51 45 9 63 67 86 3 55 78 40
Card 195: 26 99 10 13 62 14 91 77 31 44 | 22 54 60 70 27 52 58 62 55 97 90 76 96 63 72 48 86 11 80 88 30 33 45 67 74
Card 196: 2 29 23 92 61 87 75 63 50 55 | 83 7 74 69 16 4 72 62 51 37 22 10 84 28 94 24 89 5 53 88 33 14 99 41 35

90
day4/main.zig
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const std = @import("std");
const Card = struct { winning: std.ArrayList(u8), have: std.ArrayList(u8), copies: u64 };
pub fn main() !void {
const content = @embedFile("data.txt");
var cards = try parseCards(content);
defer cards.deinit();
var score1 = try findScore(&cards, 1);
std.debug.print("part 1: {d}\n", .{score1});
_ = try findScore(&cards, 2);
var numCards: u128 = 0;
for (cards.items) |c| {
numCards += c.copies;
}
std.debug.print("part 2: {any}\n", .{numCards});
}
fn findScore(cards: *std.ArrayList(Card), part: u8) !u64 {
var total: u64 = 0;
// iterate over all cards
for (cards.items, 0..) |card, i| {
var numWinners: usize = 0;
var score: u32 = 0;
// iterate over the numbers we have
for (card.have.items) |n| {
// and the winning numbers
for (card.winning.items) |w| {
if (n == w) {
numWinners += 1;
score = if (score == 0) 1 else score * 2;
}
}
}
if (part == 2) {
for (0..numWinners) |j| {
cards.items[i + j + 1].copies += card.copies;
}
}
total += score;
}
return total;
}
fn parseCards(content: []const u8) !std.ArrayList(Card) {
var lines = std.mem.split(u8, content, "\n");
var cards = std.ArrayList(Card).init(std.heap.page_allocator);
while (lines.next()) |line| {
if (line.len == 0) {
continue;
}
// break line up on :
var parts = std.mem.split(u8, line, ": ");
_ = parts.next();
// break the 2nd part up by |
var sections = std.mem.split(u8, parts.next().?, " | ");
// split the left part up on spaces
var nums = std.mem.split(u8, sections.next().?, " ");
var winning = std.ArrayList(u8).init(std.heap.page_allocator);
while (nums.next()) |d| {
if (d.len > 0) {
try winning.append(try std.fmt.parseInt(u8, d, 10));
}
}
// split the right part up on spaces
nums = std.mem.split(u8, sections.next().?, " ");
var have = std.ArrayList(u8).init(std.heap.page_allocator);
while (nums.next()) |d| {
if (d.len > 0) {
try have.append(try std.fmt.parseInt(u8, d, 10));
}
}
try cards.append(Card{ .winning = winning, .have = have, .copies = 1 });
}
return cards;
}

6
day4/test.txt
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Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
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