From 9c22642be42fa4471ff617df6638167fb21490a4 Mon Sep 17 00:00:00 2001
From: Adam Millerchip <adam@millerchip.net>
Date: Thu, 11 Aug 2022 18:32:17 +0900
Subject: [PATCH] Day 1 part 1!

---
 2020/zig/.gitignore    |  1 +
 2020/zig/src/day01.zig | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/2020/zig/.gitignore b/2020/zig/.gitignore
index 9f71afc..c2b2b95 100644
--- a/2020/zig/.gitignore
+++ b/2020/zig/.gitignore
@@ -1,3 +1,4 @@
 zig-cache/
 zig-out/
+data/
 build_runner.zig
diff --git a/2020/zig/src/day01.zig b/2020/zig/src/day01.zig
index b2d5b77..a628bb8 100644
--- a/2020/zig/src/day01.zig
+++ b/2020/zig/src/day01.zig
@@ -12,7 +12,29 @@ const gpa = util.gpa;
 const data = @embedFile("../data/day01.txt");
 
 pub fn main() !void {
+    var it = tokenize(u8, data, "\n");
 
+    // Not sure if allocating a massive buffer and tracking the size is the right approach?
+    var buffer: [1000]u16 = undefined;
+    var i: usize = 0;
+    while (it.next()) |line| {
+        const int = try parseInt(u16, line, 10);
+        buffer[i] = int;
+        // Can we use continue expression?
+        i = i + 1;
+    }
+
+    var answer: u32 = 0;
+    outer: for (buffer[0..i]) |a, j| {
+        for (buffer[(j+1)..i]) |b| {
+            if (a + b == 2020) {
+                answer = @as(u32, a) * b;
+                break :outer;
+            }
+        }
+    }
+
+    print("{d}\n", .{answer});
 }
 
 // Useful stdlib functions