commit 27d35c8788dec023199f26a484441622b37da2aa
parent 2c4ba26b5e747c7a477413690ef5ae068c635596
Author: Louis Burda <quent.burda@gmail.com>
Date: Sun, 6 Dec 2020 11:36:56 +0100
cleaned up template and added day 6
Diffstat:
5 files changed, 2280 insertions(+), 21 deletions(-)
diff --git a/data/template.zig b/data/template.zig
@@ -1,34 +1,13 @@
const std = @import("std");
const aoc = @import("aoc");
-const Entry = u16;
-
-fn freeEntries(allocator: *std.mem.Allocator, entries: std.ArrayList(Entry)) void {
- entries.deinit();
-}
-
-fn parse(allocator: *std.mem.Allocator, input: []u8) !std.ArrayList(Entry) {
- var entries = std.ArrayList(int).init(allocator);
- errdefer freeEntries(allocator, entries);
-
- // ...
-
- return entries;
-}
-
fn part1(allocator: *std.mem.Allocator, input: []u8, args: [][]u8) !void {
- const entries = try parse(allocator, input);
- defer freeEntries(allocator, entries);
-
var answer: u32 = 0;
std.debug.print("{}\n", .{answer});
}
fn part2(allocator: *std.mem.Allocator, input: []u8, args: [][]u8) !void {
- const entries = try parse(allocator, input);
- defer freeEntries(allocator, entries);
-
var answer: u32 = 0;
std.debug.print("{}\n", .{answer});
diff --git a/src/day6/input b/src/day6/input
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diff --git a/src/day6/main.zig b/src/day6/main.zig
@@ -0,0 +1,33 @@
+const std = @import("std");
+const aoc = @import("aoc");
+
+fn part1(allocator: *std.mem.Allocator, input: []u8, args: [][]u8) !void {
+ var entryit = std.mem.split(input, "\n\n");
+ var answer: u32 = 0;
+ while (entryit.next()) |group| {
+ var seen = [_]u1{0} ** 256;
+ for (group) |c| {
+ if (c == ' ' or c == '\n') continue;
+ answer += @boolToInt(seen[c] == 0);
+ seen[c] = 1;
+ }
+ }
+ std.debug.print("{}\n", .{answer});
+}
+
+fn part2(allocator: *std.mem.Allocator, input: []u8, args: [][]u8) !void {
+ var entryit = std.mem.split(input, "\n\n");
+ var answer: u32 = 0;
+ while (entryit.next()) |group| {
+ var count = [_]u16{0} ** 256;
+ var members: u16 = 0;
+ var memberit = std.mem.tokenize(group, "\n ");
+ while (memberit.next()) |member| : (members += 1) {
+ for (member) |c| count[c] += 1;
+ }
+ for (count) |v| answer += @boolToInt(v == members);
+ }
+ std.debug.print("{}\n", .{answer});
+}
+
+pub const main = aoc.gen_main(part1, part2);
diff --git a/src/day6/part1 b/src/day6/part1
@@ -0,0 +1,47 @@
+--- Day 6: Custom Customs ---
+
+As your flight approaches the regional airport where you'll switch to a much larger plane, customs
+declaration forms are distributed to the passengers.
+
+The form asks a series of 26 yes-or-no questions marked a through z. All you need to do is identify
+the questions for which [1m[37manyone in your group[0m answers "yes". Since your group is just
+you, this doesn't take very long.
+
+However, the person sitting next to you seems to be experiencing a language barrier and asks if you
+can help. For each of the people in their group, you write down the questions for which they answer
+"yes", one per line. For example:
+
+abcx abcy abcz
+
+In this group, there are [1m[37m6[0m questions to which anyone answered "yes": a, b, c, x, y, and
+z. (Duplicate answers to the same question don't count extra; each question counts at most once.)
+
+Another group asks for your help, then another, and eventually you've collected answers from every
+group on the plane (your puzzle input). Each group's answers are separated by a blank line, and
+within each group, each person's answers are on a single line. For example:
+
+abc
+
+a b c
+
+ab ac
+
+a a a a
+
+b
+
+This list represents answers from five groups:
+
+- The first group contains one person who answered "yes" to [1m[37m3[0m questions: a, b, and c. -
+The second group contains three people; combined, they answered "yes" to [1m[37m3[0m questions:
+a, b, and c. - The third group contains two people; combined, they answered "yes" to [1m[37m3[0m
+questions: a, b, and c. - The fourth group contains four people; combined, they answered "yes" to
+only [1m[37m1[0m question, a. - The last group contains one person who answered "yes" to only
+[1m[37m1[0m question, b.
+
+In this example, the sum of these counts is 3 + 3 + 3 + 1 + 1 = [1m[37m11[0m.
+
+For each group, count the number of questions to which anyone answered "yes". [1m[37mWhat is the
+sum of those counts?[0m
+
+
diff --git a/src/day6/part2 b/src/day6/part2
@@ -0,0 +1,35 @@
+--- Part Two ---
+
+As you finish the last group's customs declaration, you notice that you misread one word in the
+instructions:
+
+You don't need to identify the questions to which [1m[37manyone[0m answered "yes"; you need to
+identify the questions to which [1m[37meveryone[0m answered "yes"!
+
+Using the same example as above:
+
+abc
+
+a b c
+
+ab ac
+
+a a a a
+
+b
+
+This list represents answers from five groups:
+
+- In the first group, everyone (all 1 person) answered "yes" to [1m[37m3[0m questions: a, b, and
+c. - In the second group, there is [1m[37mno[0m question to which everyone answered "yes". - In
+the third group, everyone answered yes to only [1m[37m1[0m question, a. Since some people did not
+answer "yes" to b or c, they don't count. - In the fourth group, everyone answered yes to only
+[1m[37m1[0m question, a. - In the fifth group, everyone (all 1 person) answered "yes" to
+[1m[37m1[0m question, b.
+
+In this example, the sum of these counts is 3 + 0 + 1 + 1 + 1 = [1m[37m6[0m.
+
+For each group, count the number of questions to which [1m[37meveryone[0m answered "yes".
+[1m[37mWhat is the sum of those counts?[0m
+
+
