From 061a5bae272f45db6dcde99746922735f9769d25 Mon Sep 17 00:00:00 2001
From: Christian Segundo
Date: Mon, 5 Dec 2022 17:00:08 +0100
Subject: add day 5

---
 .github/workflows/benchmark.yml |   21 +
 Dockerfile                      |   15 +
 Makefile                        |   35 +
 README.md                       |   14 +
 bin/aoc-2022                    |  Bin 0 -> 97651 bytes
 build.zig                       |   30 +
 day-1/input                     | 2266 -----------------------------------
 day-1/main.zig                  |   46 -
 day-1/util                      |    1 -
 day-2/input                     | 2500 ---------------------------------------
 day-2/main.zig                  |  110 --
 day-2/util                      |    1 -
 day-3/input                     |  300 -----
 day-3/main.zig                  |   46 -
 day-3/util                      |    1 -
 day-4/input                     | 1000 ----------------
 day-4/main.zig                  |   47 -
 day-4/util                      |    1 -
 day_01.zig                      |   61 +
 day_02.zig                      |  110 ++
 day_03.zig                      |   63 +
 day_04.zig                      |   48 +
 day_05.zig                      |  138 +++
 inputs/day_01                   | 2266 +++++++++++++++++++++++++++++++++++
 inputs/day_02                   | 2500 +++++++++++++++++++++++++++++++++++++++
 inputs/day_03                   |  300 +++++
 inputs/day_04                   | 1000 ++++++++++++++++
 inputs/day_05                   |  513 ++++++++
 main.zig                        |  115 +-
 util/aoc.zig                    |   20 +
 util/mem.zig                    |   19 -
 31 files changed, 7198 insertions(+), 6389 deletions(-)
 create mode 100644 .github/workflows/benchmark.yml
 create mode 100644 Dockerfile
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100755 bin/aoc-2022
 create mode 100644 build.zig
 delete mode 100644 day-1/input
 delete mode 100644 day-1/main.zig
 delete mode 120000 day-1/util
 delete mode 100644 day-2/input
 delete mode 100644 day-2/main.zig
 delete mode 120000 day-2/util
 delete mode 100644 day-3/input
 delete mode 100644 day-3/main.zig
 delete mode 120000 day-3/util
 delete mode 100644 day-4/input
 delete mode 100644 day-4/main.zig
 delete mode 120000 day-4/util
 create mode 100644 day_01.zig
 create mode 100644 day_02.zig
 create mode 100644 day_03.zig
 create mode 100644 day_04.zig
 create mode 100644 day_05.zig
 create mode 100644 inputs/day_01
 create mode 100644 inputs/day_02
 create mode 100644 inputs/day_03
 create mode 100644 inputs/day_04
 create mode 100644 inputs/day_05
 create mode 100644 util/aoc.zig
 delete mode 100644 util/mem.zig

diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 0000000..f8dbc2b
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,21 @@
+---
+name: Run benchmarks
+
+on:
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.ref }}
+          fetch-depth: 0
+      - run: make docker-benchmark
+      - run: |
+          git config user.email 'actions@github.com'
+          git config user.name 'github-actions'
+          if git commit -am ':robot: Update README.md'; then
+            git push origin HEAD:${{ github.ref }}
+          fi
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..adfd1ab
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,15 @@
+FROM alpine:3.16
+
+ARG ZIG_VERSION
+
+RUN apk update && \
+    apk --no-cache add \
+        curl \
+        make \
+        musl-dev \
+        libarchive-tools && \
+    if echo ${ZIG_VERSION} | grep -q "dev"; then PREFIX=builds; else PREFIX="download/${ZIG_VERSION}"; fi && \
+    curl -s \
+      https://ziglang.org/${PREFIX}/zig-linux-x86_64-${ZIG_VERSION}.tar.xz |\
+      bsdtar -x -f - && \
+    mv zig-linux-x86_64-${ZIG_VERSION}/* /usr/local/bin/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..6285dbf
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+ZIG_VERSION=0.11.0-dev.149+7733246d6
+IMAGE_NAME=zigci
+
+all: clean test fmt benchmark
+
+clean:
+	$(RM) -rf zig-cache bin README.md
+
+test:
+	zig build test
+
+build:
+	zig build -p .
+
+benchmark: build
+	echo '```' > README.md
+	./bin/aoc-2022 2>> README.md
+	echo '```' >> README.md
+
+fmt:
+	find . -name "*.zig" -exec zig fmt --check {} \;
+
+docker-build:
+	docker build \
+		-t $(IMAGE_NAME) \
+		--build-arg ZIG_VERSION=$(ZIG_VERSION) \
+		-f Dockerfile .
+
+docker-%: docker-build
+	docker run \
+		--rm \
+		--privileged \
+		-v $(shell pwd):/data \
+		-w /data $(DOCKER_EXTRA_ARGS) \
+		$(IMAGE_NAME) sh -c "make $*"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..de3da84
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+```
+
+day=1, puzzle_1=69912, input_bytes=10517, time=102µs
+day=1, puzzle_2=208180, input_bytes=10517, time=61µs
+
+day=2, puzzle_1=12855, input_bytes=10000, time=62µs
+day=2, puzzle_2=13726, input_bytes=10000, time=70µs
+
+day=3, puzzle_1=8039, input_bytes=9946, time=33µs
+day=3, puzzle_2=2510, input_bytes=9946, time=43µs
+
+day=4, puzzle_1=483, input_bytes=11399, time=195µs
+day=4, puzzle_2=874, input_bytes=11399, time=151µs
+```
diff --git a/bin/aoc-2022 b/bin/aoc-2022
new file mode 100755
index 0000000..7d7dca3
Binary files /dev/null and b/bin/aoc-2022 differ
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..ab47001
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,30 @@
+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    const exe = b.addExecutable("aoc-2022", "main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(std.builtin.Mode.ReleaseFast);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_tests = b.addTest("main.zig");
+    exe_tests.setTarget(target);
+    exe_tests.setBuildMode(std.builtin.Mode.Debug);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&exe_tests.step);
+}
diff --git a/day-1/input b/day-1/input
deleted file mode 100644
index 6c1f923..0000000
--- a/day-1/input
+++ /dev/null
@@ -1,2266 +0,0 @@
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diff --git a/day-1/main.zig b/day-1/main.zig
deleted file mode 100644
index d985c9b..0000000
--- a/day-1/main.zig
+++ /dev/null
@@ -1,46 +0,0 @@
-const std = @import("std");
-const min_idx = @import("util/mem.zig").min_idx;
-
-pub fn puzzle_1(input: []const u8) !i32 {
-    var iter = std.mem.split(u8, input, "\n");
-    var count: i32 = 0;
-    var max: i32 = 0;
-
-    while (iter.next()) |line| {
-        if (line.len == 0) {
-            if (count > max) {
-                max = count;
-            }
-            count = 0;
-        } else {
-            count += try std.fmt.parseInt(i32, line, 0);
-        }
-    }
-
-    return max;
-}
-
-pub fn puzzle_2(input: []const u8) !i32 {
-    var iter = std.mem.split(u8, input, "\n");
-    var count: i32 = 0;
-    var max: [3]i32 = std.mem.zeroes([3]i32);
-
-    while (iter.next()) |line| {
-        if (line.len == 0) {
-            const lowest_u = min_idx(i32, &max);
-            if (count > max[lowest_u]) {
-                max[lowest_u] = count;
-            }
-            count = 0;
-        } else {
-            count += try std.fmt.parseInt(i32, line, 0);
-        }
-    }
-
-    count = 0;
-    for (max) |v| {
-        count += v;
-    }
-
-    return count;
-}
diff --git a/day-1/util b/day-1/util
deleted file mode 120000
index 40c3fc5..0000000
--- a/day-1/util
+++ /dev/null
@@ -1 +0,0 @@
-../util
\ No newline at end of file
diff --git a/day-2/input b/day-2/input
deleted file mode 100644
index e49a6c4..0000000
--- a/day-2/input
+++ /dev/null
@@ -1,2500 +0,0 @@
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diff --git a/day-2/main.zig b/day-2/main.zig
deleted file mode 100644
index 3289ad2..0000000
--- a/day-2/main.zig
+++ /dev/null
@@ -1,110 +0,0 @@
-const std = @import("std");
-const slurp = @import("util/file.zig").slurp;
-
-const Hand = enum(u8) { Rock = 1, Paper = 2, Scissors = 3 };
-const Outcome = enum(u8) { Win = 6, Draw = 3, Lose = 0 };
-
-const KV_Hand = struct { @"0": []const u8, @"1": Hand };
-const KV_Outcome = struct { @"0": []const u8, @"1": Outcome };
-
-const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
-    .{ .@"0" = "A", .@"1" = .Rock },
-    .{ .@"0" = "B", .@"1" = .Paper },
-    .{ .@"0" = "C", .@"1" = .Scissors },
-});
-
-const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
-    .{ .@"0" = "X", .@"1" = .Rock },
-    .{ .@"0" = "Y", .@"1" = .Paper },
-    .{ .@"0" = "Z", .@"1" = .Scissors },
-});
-
-const Outcome_KV = std.ComptimeStringMap(Outcome, [_]KV_Outcome{
-    .{ .@"0" = "X", .@"1" = .Lose },
-    .{ .@"0" = "Y", .@"1" = .Draw },
-    .{ .@"0" = "Z", .@"1" = .Win },
-});
-
-const match_impl = struct {
-    fn puzzle_1(a: Hand, b: Hand) u8 {
-        switch (b) {
-            .Rock => {
-                switch (a) {
-                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Win),
-                }
-            },
-            .Paper => {
-                switch (a) {
-                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Win),
-                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-                }
-            },
-            .Scissors => {
-                switch (a) {
-                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Win),
-                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-                }
-            },
-        }
-    }
-
-    fn puzzle_2(a: Hand, b: Outcome) u8 {
-        switch (a) {
-            .Rock => {
-                switch (b) {
-                    .Win => return @enumToInt(b) + @enumToInt(Hand.Paper),
-                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Scissors),
-                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Rock),
-                }
-            },
-            .Paper => {
-                switch (b) {
-                    .Win => return @enumToInt(b) + @enumToInt(Hand.Scissors),
-                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Rock),
-                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Paper),
-                }
-            },
-            .Scissors => {
-                switch (b) {
-                    .Win => return @enumToInt(b) + @enumToInt(Hand.Rock),
-                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Paper),
-                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Scissors),
-                }
-            },
-        }
-    }
-};
-
-pub fn puzzle_1(input: []const u8) u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var score: u16 = 0;
-
-    while (iter.next()) |line| {
-        score += match_impl.puzzle_1(
-            Player_A_KV.get(&[_]u8{line[0]}).?,
-            Player_B_KV.get(&[_]u8{line[2]}).?,
-        );
-    }
-
-    return score;
-}
-
-pub fn puzzle_2(input: []const u8) u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var score: u16 = 0;
-
-    while (iter.next()) |line| {
-        score += match_impl.puzzle_2(
-            Player_A_KV.get(&[_]u8{line[0]}).?,
-            Outcome_KV.get(&[_]u8{line[2]}).?,
-        );
-    }
-
-    return score;
-}
diff --git a/day-2/util b/day-2/util
deleted file mode 120000
index 40c3fc5..0000000
--- a/day-2/util
+++ /dev/null
@@ -1 +0,0 @@
-../util
\ No newline at end of file
diff --git a/day-3/input b/day-3/input
deleted file mode 100644
index fca63f0..0000000
--- a/day-3/input
+++ /dev/null
@@ -1,300 +0,0 @@
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diff --git a/day-3/main.zig b/day-3/main.zig
deleted file mode 100644
index 57057bf..0000000
--- a/day-3/main.zig
+++ /dev/null
@@ -1,46 +0,0 @@
-const std = @import("std");
-
-pub fn puzzle_1(input: []const u8) u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var count: u16 = 0;
-    while (iter.next()) |line| {
-        var p1: u64 = 0;
-        var p2: u64 = 0;
-
-        for (line[0 .. line.len / 2]) |_, i| {
-            p1 |= @as(u64, 1) << @intCast(u6, line[i] - 65); // 65 == 'A'
-            p2 |= @as(u64, 1) << @intCast(u6, line[i + line.len / 2] - 65);
-        }
-
-        count += char_to_priority(@intCast(u8, 65 + 63) - @clz(p1 & p2));
-    }
-
-    return count;
-}
-
-pub fn puzzle_2(input: []const u8) u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var count: u16 = 0;
-    mainLoop: while (true) {
-        var parts = std.mem.zeroes([3]u64);
-
-        for (parts) |*p| {
-            const line = iter.next() orelse break :mainLoop;
-            for (line) |_, i| {
-                p.* |= @as(u64, 1) << @intCast(u6, line[i] - 65);
-            }
-        }
-
-        count += char_to_priority(@intCast(u8, 65 + 63) - @clz(parts[0] & parts[1] & parts[2]));
-    }
-
-    return count;
-}
-
-fn char_to_priority(char: u8) u8 {
-    if (char >= 65 and char <= 90)
-        return char - 38;
-    return char - 96;
-}
diff --git a/day-3/util b/day-3/util
deleted file mode 120000
index 40c3fc5..0000000
--- a/day-3/util
+++ /dev/null
@@ -1 +0,0 @@
-../util
\ No newline at end of file
diff --git a/day-4/input b/day-4/input
deleted file mode 100644
index cbdde37..0000000
--- a/day-4/input
+++ /dev/null
@@ -1,1000 +0,0 @@
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diff --git a/day-4/main.zig b/day-4/main.zig
deleted file mode 100644
index 6c0d193..0000000
--- a/day-4/main.zig
+++ /dev/null
@@ -1,47 +0,0 @@
-const std = @import("std");
-
-pub fn puzzle_1(input: []const u8) !u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var count: u16 = 0;
-    while (iter.next()) |line| {
-        const range = try parse_range(line);
-
-        if ((range[0][0] >= range[1][0] and range[0][1] <= range[1][1]) or
-            (range[0][0] <= range[1][0] and range[0][1] >= range[1][1]))
-            count += 1;
-    }
-
-    return count;
-}
-
-pub fn puzzle_2(input: []const u8) !u16 {
-    var iter = std.mem.split(u8, input, "\n");
-
-    var count: u16 = 0;
-    while (iter.next()) |line| {
-        const range = try parse_range(line);
-
-        if ((range[0][0] >= range[1][0] and range[0][0] <= range[1][1]) or
-            (range[0][0] <= range[1][0] and range[0][1] >= range[1][0]))
-            count += 1;
-    }
-
-    return count;
-}
-
-fn parse_range(line: []const u8) ![2][2]u8 {
-    var r = std.mem.zeroes([2][2]u8);
-
-    var parts = std.mem.split(u8, line, ",");
-    var p1 = std.mem.split(u8, parts.next().?, "-");
-    var p2 = std.mem.split(u8, parts.next().?, "-");
-
-    r[0][0] = try std.fmt.parseInt(u8, p1.next().?, 0);
-    r[0][1] = try std.fmt.parseInt(u8, p1.next().?, 0);
-
-    r[1][0] = try std.fmt.parseInt(u8, p2.next().?, 0);
-    r[1][1] = try std.fmt.parseInt(u8, p2.next().?, 0);
-
-    return r;
-}
diff --git a/day-4/util b/day-4/util
deleted file mode 120000
index 40c3fc5..0000000
--- a/day-4/util
+++ /dev/null
@@ -1 +0,0 @@
-../util
\ No newline at end of file
diff --git a/day_01.zig b/day_01.zig
new file mode 100644
index 0000000..80bb649
--- /dev/null
+++ b/day_01.zig
@@ -0,0 +1,61 @@
+const std = @import("std");
+const math = std.math;
+const Result = @import("util/aoc.zig").Result;
+
+pub fn puzzle_1(input: []const u8) !Result {
+    var iter = std.mem.split(u8, input, "\n");
+    var count: i32 = 0;
+    var max: i32 = 0;
+
+    while (iter.next()) |line| {
+        if (line.len == 0) {
+            if (count > max) {
+                max = count;
+            }
+            count = 0;
+        } else {
+            count += try std.fmt.parseInt(i32, line, 0);
+        }
+    }
+
+    return .{ .int = max };
+}
+
+pub fn puzzle_2(input: []const u8) !Result {
+    var iter = std.mem.split(u8, input, "\n");
+    var count: i32 = 0;
+    var max: [3]i32 = std.mem.zeroes([3]i32);
+
+    while (iter.next()) |line| {
+        if (line.len == 0) {
+            const lowest_u = min_idx(i32, &max);
+            if (count > max[lowest_u]) {
+                max[lowest_u] = count;
+            }
+            count = 0;
+        } else {
+            count += try std.fmt.parseInt(i32, line, 0);
+        }
+    }
+
+    count = 0;
+    for (max) |v| {
+        count += v;
+    }
+
+    return .{ .int = count };
+}
+
+fn min_idx(comptime T: type, slice: []const T) usize {
+    var best = slice[0];
+    var idx: usize = 0;
+
+    for (slice[1..]) |item, i| {
+        const possible_best = math.min(best, item);
+        if (best > possible_best) {
+            best = possible_best;
+            idx = i + 1;
+        }
+    }
+    return idx;
+}
diff --git a/day_02.zig b/day_02.zig
new file mode 100644
index 0000000..ce5e165
--- /dev/null
+++ b/day_02.zig
@@ -0,0 +1,110 @@
+const std = @import("std");
+const Result = @import("util/aoc.zig").Result;
+
+const Hand = enum(u8) { Rock = 1, Paper = 2, Scissors = 3 };
+const Outcome = enum(u8) { Win = 6, Draw = 3, Lose = 0 };
+
+const KV_Hand = struct { @"0": []const u8, @"1": Hand };
+const KV_Outcome = struct { @"0": []const u8, @"1": Outcome };
+
+const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
+    .{ .@"0" = "A", .@"1" = .Rock },
+    .{ .@"0" = "B", .@"1" = .Paper },
+    .{ .@"0" = "C", .@"1" = .Scissors },
+});
+
+const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
+    .{ .@"0" = "X", .@"1" = .Rock },
+    .{ .@"0" = "Y", .@"1" = .Paper },
+    .{ .@"0" = "Z", .@"1" = .Scissors },
+});
+
+const Outcome_KV = std.ComptimeStringMap(Outcome, [_]KV_Outcome{
+    .{ .@"0" = "X", .@"1" = .Lose },
+    .{ .@"0" = "Y", .@"1" = .Draw },
+    .{ .@"0" = "Z", .@"1" = .Win },
+});
+
+const match_impl = struct {
+    fn puzzle_1(a: Hand, b: Hand) u8 {
+        switch (b) {
+            .Rock => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                }
+            },
+            .Paper => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                }
+            },
+            .Scissors => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                }
+            },
+        }
+    }
+
+    fn puzzle_2(a: Hand, b: Outcome) u8 {
+        switch (a) {
+            .Rock => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                }
+            },
+            .Paper => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                }
+            },
+            .Scissors => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                }
+            },
+        }
+    }
+};
+
+pub fn puzzle_1(input: []const u8) Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var score: u16 = 0;
+
+    while (iter.next()) |line| {
+        score += match_impl.puzzle_1(
+            Player_A_KV.get(&[_]u8{line[0]}).?,
+            Player_B_KV.get(&[_]u8{line[2]}).?,
+        );
+    }
+
+    return .{ .int = score };
+}
+
+pub fn puzzle_2(input: []const u8) Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var score: u16 = 0;
+
+    while (iter.next()) |line| {
+        score += match_impl.puzzle_2(
+            Player_A_KV.get(&[_]u8{line[0]}).?,
+            Outcome_KV.get(&[_]u8{line[2]}).?,
+        );
+    }
+
+    return .{ .int = score };
+}
diff --git a/day_03.zig b/day_03.zig
new file mode 100644
index 0000000..b33c5cf
--- /dev/null
+++ b/day_03.zig
@@ -0,0 +1,63 @@
+const std = @import("std");
+const Result = @import("util/aoc.zig").Result;
+
+pub fn puzzle_1(input: []const u8) Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var count: u16 = 0;
+    while (iter.next()) |line| {
+        var p1: u64 = 0;
+        var p2: u64 = 0;
+
+        // A note to whoever reads this in the future
+        // A to Z -> 65 to 90
+        // a to z -> 97 to 122
+        //
+        // u64 is ok
+        // 90 - 65 + 122 - 97 = 50
+
+        for (line[0 .. line.len / 2]) |_, i| {
+            p1 |= @as(u64, 1) << @intCast(u6, line[i] - 65); // 65 == 'A'
+            p2 |= @as(u64, 1) << @intCast(u6, line[i + line.len / 2] - 65);
+        }
+
+        // Example
+        //
+        // p1: 0000000101100010001000110000000000011000000011000010000100
+        // p2: 1000001000000000000110000000000000000001011001100001100000
+        //
+        //  &: 0000000000000000000000000000000000000000000001000000000000 = 46 0s
+        //
+        //  65 + 63 - 46 = 82 = R
+
+        count += char_to_priority(@intCast(u8, 65 + 63) - @clz(p1 & p2));
+    }
+
+    return .{ .int = count };
+}
+
+pub fn puzzle_2(input: []const u8) Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var count: u16 = 0;
+    mainLoop: while (true) {
+        var parts = std.mem.zeroes([3]u64);
+
+        for (parts) |*p| {
+            const line = iter.next() orelse break :mainLoop;
+            for (line) |_, i| {
+                p.* |= @as(u64, 1) << @intCast(u6, line[i] - 65);
+            }
+        }
+
+        count += char_to_priority(@intCast(u8, 65 + 63) - @clz(parts[0] & parts[1] & parts[2]));
+    }
+
+    return .{ .int = count };
+}
+
+fn char_to_priority(char: u8) u8 {
+    if (char >= 65 and char <= 90)
+        return char - 38;
+    return char - 96;
+}
diff --git a/day_04.zig b/day_04.zig
new file mode 100644
index 0000000..0fa2fdb
--- /dev/null
+++ b/day_04.zig
@@ -0,0 +1,48 @@
+const std = @import("std");
+const Result = @import("util/aoc.zig").Result;
+
+pub fn puzzle_1(input: []const u8) !Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var count: u16 = 0;
+    while (iter.next()) |line| {
+        const range = try parse_range(line);
+
+        if ((range[0][0] >= range[1][0] and range[0][1] <= range[1][1]) or
+            (range[0][0] <= range[1][0] and range[0][1] >= range[1][1]))
+            count += 1;
+    }
+
+    return .{ .int = count };
+}
+
+pub fn puzzle_2(input: []const u8) !Result {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var count: u16 = 0;
+    while (iter.next()) |line| {
+        const range = try parse_range(line);
+
+        if ((range[0][0] >= range[1][0] and range[0][0] <= range[1][1]) or
+            (range[0][0] <= range[1][0] and range[0][1] >= range[1][0]))
+            count += 1;
+    }
+
+    return .{ .int = count };
+}
+
+fn parse_range(line: []const u8) ![2][2]u8 {
+    var r = std.mem.zeroes([2][2]u8);
+
+    var parts = std.mem.split(u8, line, ",");
+    var p1 = std.mem.split(u8, parts.next().?, "-");
+    var p2 = std.mem.split(u8, parts.next().?, "-");
+
+    r[0][0] = try std.fmt.parseInt(u8, p1.next().?, 0);
+    r[0][1] = try std.fmt.parseInt(u8, p1.next().?, 0);
+
+    r[1][0] = try std.fmt.parseInt(u8, p2.next().?, 0);
+    r[1][1] = try std.fmt.parseInt(u8, p2.next().?, 0);
+
+    return r;
+}
diff --git a/day_05.zig b/day_05.zig
new file mode 100644
index 0000000..884fd81
--- /dev/null
+++ b/day_05.zig
@@ -0,0 +1,138 @@
+const std = @import("std");
+const Result = @import("util/aoc.zig").Result;
+
+const MAX_HEIGHT = 100;
+
+const Command = struct { From: u8, To: u8, Crates: u8 };
+const Data = struct {
+    Commands: []Command,
+    Crates: [][MAX_HEIGHT]u8,
+
+    fn deinit(self: Data, allocator: std.mem.Allocator) void {
+        allocator.free(self.Commands);
+        allocator.free(self.Crates);
+    }
+};
+
+pub fn puzzle_1(allocator: std.mem.Allocator, input: []const u8) !Result {
+    var data = try parse_input(allocator, input);
+    defer data.deinit(allocator);
+
+    for (data.Commands) |command| {
+        var command_crates = command.Crates;
+
+        while (command_crates > 0) : (command_crates -= 1) {
+            if (command_crates == 0) break;
+            const tmp = data.Crates[command.From][len(data.Crates[command.From]) - 1];
+            data.Crates[command.From][len(data.Crates[command.From]) - 1] = 0;
+            data.Crates[command.To][len(data.Crates[command.To])] = tmp;
+        }
+    }
+
+    return build_answer(allocator, data.Crates);
+}
+
+pub fn puzzle_2(allocator: std.mem.Allocator, input: []const u8) !Result {
+    var data = try parse_input(allocator, input);
+    defer data.deinit(allocator);
+
+    for (data.Commands) |command| {
+        var command_crates = command.Crates;
+
+        const crate_stack = blk: {
+            var r = std.mem.zeroes([MAX_HEIGHT]u8);
+            var idx: usize = 0;
+
+            while (command_crates > 0) : (command_crates -= 1) {
+                if (command_crates == 0) break;
+                r[idx] = data.Crates[command.From][len(data.Crates[command.From]) - 1];
+                data.Crates[command.From][len(data.Crates[command.From]) - 1] = 0;
+                idx += 1;
+            }
+
+            break :blk r;
+        };
+        var crate_stack_height = len(crate_stack);
+
+        while (true) {
+            data.Crates[command.To][len(data.Crates[command.To])] = crate_stack[crate_stack_height];
+            if (crate_stack_height == 0) break;
+            crate_stack_height -= 1;
+        }
+    }
+
+    return build_answer(allocator, data.Crates);
+}
+
+fn build_answer(allocator: std.mem.Allocator, crates: [][MAX_HEIGHT]u8) !Result {
+    var i: usize = 0;
+    var r = try std.ArrayList(u8).initCapacity(allocator, crates.len);
+    while (i < crates.len) : (i += 1) {
+        r.appendAssumeCapacity(crates[i][len(crates[i]) - 1]);
+    }
+
+    return .{ .string = r.toOwnedSlice() };
+}
+
+fn parse_input(allocator: std.mem.Allocator, input: []const u8) !Data {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var floor: u8 = 0;
+    var rows: u8 = 0;
+
+    while (iter.next()) |line| : (floor += 1) {
+        if (line[1] == '1') {
+            var rows_iter = std.mem.splitBackwards(u8, line, " ");
+            _ = rows_iter.next();
+            rows = try std.fmt.parseInt(u8, rows_iter.next() orelse unreachable, 0);
+            iter.reset();
+            break;
+        }
+    }
+
+    var crates = blk: {
+        var r = try std.ArrayList([MAX_HEIGHT]u8).initCapacity(allocator, rows);
+        var i: usize = 0;
+        while (i < rows) : (i += 1) r.appendAssumeCapacity(std.mem.zeroes([MAX_HEIGHT]u8));
+        break :blk r.toOwnedSlice();
+    };
+
+    while (iter.next()) |line| : (floor -= 1) {
+        if (floor == 0) break;
+
+        var row: usize = 0;
+        var offset: usize = 1;
+        while (row < rows) : (row += 1) {
+            if (line[offset] != ' ')
+                crates[row][floor - 1] = line[offset];
+            offset += 4;
+        }
+    }
+
+    // There is an extra line between floor and commands
+    iter.index = iter.index.? + 1;
+    var commands = std.ArrayList(Command).init(allocator);
+    var i: usize = 0;
+    while (iter.next()) |line| : (i += 1) {
+        var command: Command = undefined;
+        var line_iter = std.mem.split(u8, line, " ");
+        _ = line_iter.next(); // move
+        command.Crates = try std.fmt.parseInt(u8, line_iter.next() orelse unreachable, 0);
+        _ = line_iter.next(); // from
+        command.From = try std.fmt.parseInt(u8, line_iter.next() orelse unreachable, 0) - 1;
+        _ = line_iter.next(); // to
+        command.To = try std.fmt.parseInt(u8, line_iter.next() orelse unreachable, 0) - 1;
+        try commands.append(command);
+    }
+    return .{ .Commands = commands.toOwnedSlice(), .Crates = crates };
+}
+
+fn len(row: [MAX_HEIGHT]u8) usize {
+    for (row) |v, i| {
+        if (v == 0) {
+            if (i > 0) return i;
+            return 0;
+        }
+    }
+    unreachable;
+}
diff --git a/inputs/day_01 b/inputs/day_01
new file mode 100644
index 0000000..6c1f923
--- /dev/null
+++ b/inputs/day_01
@@ -0,0 +1,2266 @@
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diff --git a/inputs/day_02 b/inputs/day_02
new file mode 100644
index 0000000..e49a6c4
--- /dev/null
+++ b/inputs/day_02
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diff --git a/inputs/day_03 b/inputs/day_03
new file mode 100644
index 0000000..fca63f0
--- /dev/null
+++ b/inputs/day_03
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diff --git a/inputs/day_04 b/inputs/day_04
new file mode 100644
index 0000000..cbdde37
--- /dev/null
+++ b/inputs/day_04
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diff --git a/inputs/day_05 b/inputs/day_05
new file mode 100644
index 0000000..a572b71
--- /dev/null
+++ b/inputs/day_05
@@ -0,0 +1,513 @@
+[G]                 [D] [R]        
+[W]         [V]     [C] [T] [M]    
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+move 2 from 8 to 1
+move 1 from 7 to 3
+move 1 from 3 to 8
+move 2 from 9 to 8
+move 29 from 1 to 9
+move 2 from 1 to 5
+move 2 from 8 to 3
+move 1 from 3 to 5
+move 2 from 5 to 9
+move 1 from 5 to 7
+move 25 from 9 to 2
+move 10 from 2 to 1
+move 1 from 7 to 8
+move 2 from 4 to 1
+move 2 from 8 to 9
+move 1 from 8 to 6
+move 4 from 2 to 4
+move 4 from 2 to 5
+move 1 from 6 to 5
+move 1 from 2 to 7
+move 2 from 4 to 1
+move 18 from 1 to 3
+move 8 from 9 to 4
+move 15 from 3 to 9
+move 3 from 4 to 8
+move 4 from 5 to 8
+move 4 from 2 to 4
+move 10 from 9 to 4
+move 4 from 8 to 5
+move 2 from 7 to 2
+move 11 from 4 to 9
+move 12 from 4 to 9
+move 2 from 5 to 7
+move 4 from 2 to 4
+move 5 from 8 to 1
+move 1 from 5 to 6
+move 1 from 4 to 6
+move 1 from 3 to 9
+move 1 from 5 to 7
+move 4 from 1 to 6
+move 6 from 1 to 5
+move 6 from 5 to 9
+move 3 from 7 to 6
+move 9 from 6 to 5
+move 8 from 5 to 2
+move 7 from 2 to 3
+move 1 from 3 to 1
+move 7 from 3 to 5
+move 2 from 4 to 1
+move 1 from 2 to 6
+move 2 from 1 to 3
+move 8 from 5 to 9
+move 3 from 1 to 3
+move 1 from 6 to 1
+move 2 from 4 to 1
+move 1 from 5 to 2
+move 2 from 1 to 6
+move 2 from 6 to 3
+move 2 from 3 to 2
+move 2 from 2 to 4
+move 1 from 2 to 6
+move 3 from 3 to 9
+move 2 from 4 to 8
+move 3 from 3 to 1
+move 4 from 1 to 7
+move 2 from 8 to 4
+move 7 from 9 to 6
+move 1 from 1 to 4
+move 11 from 9 to 7
+move 3 from 9 to 3
+move 14 from 9 to 5
+move 6 from 6 to 5
+move 4 from 5 to 9
+move 10 from 7 to 6
+move 1 from 3 to 7
+move 2 from 4 to 1
+move 4 from 7 to 9
+move 9 from 6 to 1
+move 3 from 6 to 5
+move 15 from 9 to 1
+move 1 from 4 to 7
+move 4 from 9 to 7
+move 12 from 5 to 1
+move 3 from 7 to 3
+move 4 from 7 to 2
+move 1 from 9 to 3
+move 22 from 1 to 2
+move 21 from 2 to 6
+move 3 from 1 to 9
+move 1 from 3 to 7
+move 1 from 7 to 3
+move 1 from 3 to 2
+move 8 from 1 to 4
+move 1 from 9 to 2
+move 7 from 4 to 8
+move 3 from 3 to 9
+move 3 from 3 to 5
+move 4 from 2 to 3
+move 1 from 1 to 3
+move 4 from 8 to 5
+move 2 from 8 to 3
+move 5 from 3 to 2
+move 6 from 5 to 3
+move 2 from 5 to 8
+move 2 from 1 to 7
+move 2 from 7 to 4
+move 15 from 6 to 9
+move 8 from 3 to 1
+move 3 from 5 to 9
+move 2 from 4 to 9
+move 8 from 1 to 3
+move 8 from 9 to 8
+move 1 from 1 to 4
+move 3 from 5 to 9
+move 4 from 8 to 1
+move 1 from 3 to 9
+move 2 from 4 to 3
+move 2 from 8 to 6
+move 3 from 8 to 7
+move 8 from 2 to 5
+move 3 from 5 to 2
+move 4 from 3 to 4
+move 3 from 6 to 1
+move 2 from 5 to 9
+move 4 from 4 to 1
+move 2 from 5 to 6
+move 1 from 5 to 4
+move 2 from 2 to 1
+move 4 from 3 to 9
+move 1 from 7 to 3
+move 2 from 7 to 4
+move 2 from 4 to 7
+move 1 from 6 to 7
+move 1 from 2 to 8
+move 2 from 3 to 9
+move 14 from 1 to 8
+move 1 from 6 to 2
+move 2 from 7 to 1
+move 3 from 8 to 3
+move 6 from 8 to 5
diff --git a/main.zig b/main.zig
index 6609a2f..3d0ecb4 100644
--- a/main.zig
+++ b/main.zig
@@ -1,10 +1,72 @@
 const std = @import("std");
+const Result = @import("util/aoc.zig").Result;
+
+const t = [_]struct {
+    day: type,
+    expect: []const Result,
+    input: []const u8,
+}{
+    .{ .day = @import("day_01.zig"), .input = @embedFile("inputs/day_01"), .expect = &[_]Result{ .{ .int = 69912 }, .{ .int = 208180 } } },
+    .{ .day = @import("day_02.zig"), .input = @embedFile("inputs/day_02"), .expect = &[_]Result{ .{ .int = 12855 }, .{ .int = 13726 } } },
+    .{ .day = @import("day_03.zig"), .input = @embedFile("inputs/day_03"), .expect = &[_]Result{ .{ .int = 8039 }, .{ .int = 2510 } } },
+    .{ .day = @import("day_04.zig"), .input = @embedFile("inputs/day_04"), .expect = &[_]Result{ .{ .int = 483 }, .{ .int = 874 } } },
+    .{ .day = @import("day_05.zig"), .input = @embedFile("inputs/day_05"), .expect = &[_]Result{ .{ .string = "SHMSDGZVC" }, .{ .string = "VRZGHDFBQ" } } },
+};
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+    return run_all(allocator);
+}
 
 test {
     std.testing.refAllDecls(@This());
 }
 
-fn solve(allocator: std.mem.Allocator, puzzle: anytype, input: []const u8) !i32 {
+fn run_all(allocator: std.mem.Allocator) !void {
+    inline for (t) |aoc_day, day| {
+        std.debug.print("\n", .{});
+        inline for (aoc_day.expect) |expect, idx| {
+            const fn_name = comptimePrint("puzzle_{d}", .{idx + 1});
+            const puzzle = @field(aoc_day.day, fn_name);
+            const start_time = try std.time.Instant.now();
+
+            const result = try solve(
+                allocator,
+                puzzle,
+                aoc_day.input[0 .. aoc_day.input.len - 1], // remove the last '^\n$'
+            );
+            defer result.deinit(allocator);
+
+            const end_time = try std.time.Instant.now();
+            const elapsed_us = end_time.since(start_time) / std.time.ns_per_us;
+
+            std.debug.print("day={d}, input_bytes={d}, time={d}µs, ", .{
+                day + 1,
+                aoc_day.input.len,
+                elapsed_us,
+            });
+
+            switch (result) {
+                .string => |s| std.debug.print("puzzle_{d}={s}", .{ idx + 1, s }),
+                .int => |i| std.debug.print("puzzle_{d}={d}", .{ idx + 1, i }),
+            }
+
+            if (!expect.cmp(result)) {
+                switch (expect) {
+                    .string => |s| std.debug.print(", expected={s}\n", .{s}),
+                    .int => |i| std.debug.print(", expected={d}\n", .{i}),
+                }
+                return error.UnexpectedValue;
+            }
+
+            std.debug.print("\n", .{});
+        }
+    }
+}
+
+fn solve(allocator: std.mem.Allocator, puzzle: anytype, input: []const u8) !Result {
     return blk: {
         switch (@typeInfo(@TypeOf(puzzle))) {
             .Fn => |f| {
@@ -39,56 +101,7 @@ inline fn comptimePrint(comptime fmt: []const u8, args: anytype) *const [std.fmt
 }
 
 test "test" {
-    const t = [_]struct {
-        day: type,
-        expect: []const i32,
-        input: []const u8,
-    }{
-        .{ .day = @import("day-1/main.zig"), .input = @embedFile("day-1/input"), .expect = &[_]i32{ 69912, 208180 } },
-        .{ .day = @import("day-2/main.zig"), .input = @embedFile("day-2/input"), .expect = &[_]i32{ 12855, 13726 } },
-        .{ .day = @import("day-3/main.zig"), .input = @embedFile("day-3/input"), .expect = &[_]i32{ 8039, 2510 } },
-        .{ .day = @import("day-4/main.zig"), .input = @embedFile("day-4/input"), .expect = &[_]i32{ 483, 874 } },
-    };
-
     std.debug.print("\n", .{});
-
-    inline for (t) |aoc_day, day| {
-        std.debug.print("\n", .{});
-        inline for (aoc_day.expect) |expected, idx| {
-            const fn_name = comptimePrint("puzzle_{d}", .{idx + 1});
-            const puzzle = @field(aoc_day.day, fn_name);
-            const start_time = try std.time.Instant.now();
-
-            const result = try solve(
-                testing_allocator,
-                puzzle,
-                aoc_day.input[0 .. aoc_day.input.len - 1], // remove the last '^\n$'
-            );
-
-            const end_time = try std.time.Instant.now();
-            const elapsed_us = end_time.since(start_time) / std.time.ns_per_us;
-
-            if (result == expected) {
-                std.debug.print("day={d}, puzzle_{d}={d}, input_bytes={d}, time={d}µs\n", .{
-                    day + 1,
-                    idx + 1,
-                    result,
-                    aoc_day.input.len,
-                    elapsed_us,
-                });
-            } else {
-                std.debug.print("day={d}, puzzle_{d}={d}, input_bytes={d}, time={d}µs, expected={d}\n", .{
-                    day + 1,
-                    idx + 1,
-                    result,
-                    aoc_day.input.len,
-                    elapsed_us,
-                    expected,
-                });
-                return error.UnexpectedValue;
-            }
-        }
-    }
-
+    try run_all(testing_allocator);
     std.debug.print("\n", .{});
 }
diff --git a/util/aoc.zig b/util/aoc.zig
new file mode 100644
index 0000000..0c3e668
--- /dev/null
+++ b/util/aoc.zig
@@ -0,0 +1,20 @@
+const std = @import("std");
+
+pub const Result = union(enum) {
+    int: i32,
+    string: []const u8,
+
+    pub fn cmp(self: Result, result: Result) bool {
+        switch (self) {
+            .int => |i| return i == result.int,
+            .string => |s| return std.mem.eql(u8, s, result.string),
+        }
+    }
+
+    pub fn deinit(self: Result, allocator: std.mem.Allocator) void {
+        switch (self) {
+            .string => |s| return allocator.free(s),
+            else => {},
+        }
+    }
+};
diff --git a/util/mem.zig b/util/mem.zig
deleted file mode 100644
index 728db44..0000000
--- a/util/mem.zig
+++ /dev/null
@@ -1,19 +0,0 @@
-const std = @import("std");
-
-const math = std.math;
-const testing_allocator = std.testing.allocator;
-
-/// Returns the position of the smallest number in a slice.
-pub fn min_idx(comptime T: type, slice: []const T) usize {
-    var best = slice[0];
-    var idx: usize = 0;
-
-    for (slice[1..]) |item, i| {
-        const possible_best = math.min(best, item);
-        if (best > possible_best) {
-            best = possible_best;
-            idx = i + 1;
-        }
-    }
-    return idx;
-}
-- 
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