commit 08a13d416c92edb0248c3dc2789a38c9032a6fe9
Author: Nick Thomas <me@ur.gs>
Date:   Sun Dec 1 17:40:23 2019 +0000

    Day 01

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2040c29
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+zig-cache
diff --git a/01/build.zig b/01/build.zig
new file mode 100644
index 0000000..2ab06e7
--- /dev/null
+++ b/01/build.zig
@@ -0,0 +1,14 @@
+const Builder = @import("std").build.Builder;
+
+pub fn build(b: *Builder) void {
+    const mode = b.standardReleaseOptions();
+    const exe = b.addExecutable("01", "src/main.zig");
+    exe.setBuildMode(mode);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+}
diff --git a/01/input b/01/input
new file mode 100644
index 0000000..dde704b
--- /dev/null
+++ b/01/input
@@ -0,0 +1,100 @@
+109067
+75007
+66030
+93682
+83818
+108891
+139958
+129246
+80272
+119897
+112804
+69495
+95884
+85402
+148361
+75986
+120063
+127683
+146962
+76907
+61414
+98452
+134330
+53858
+82662
+143258
+82801
+60279
+131782
+105989
+102464
+96563
+71172
+113731
+90645
+94830
+133247
+110149
+54792
+134863
+125919
+145490
+69836
+108808
+87954
+148957
+110182
+126668
+148024
+96915
+117727
+147378
+75967
+91915
+60130
+85331
+66800
+103419
+72627
+72687
+61606
+113160
+107082
+110793
+61589
+105005
+73952
+65705
+117243
+140944
+117091
+113482
+91379
+148185
+113853
+119822
+78179
+85407
+119886
+109230
+68783
+63914
+51101
+93549
+53361
+127984
+106315
+54997
+138941
+81075
+120272
+120307
+98414
+115245
+105649
+89793
+88421
+121104
+97084
+56928
diff --git a/01/src/main.zig b/01/src/main.zig
new file mode 100644
index 0000000..b357db7
--- /dev/null
+++ b/01/src/main.zig
@@ -0,0 +1,33 @@
+const std = @import("std");
+
+fn rocket(in: i64) i64 {
+    var x: i64 = @divFloor(in, 3) - 2;
+    if (x < 0) {
+        x = 0;
+    }
+
+    return x;
+}
+
+pub fn main() anyerror!void {
+    const file = std.io.getStdIn();
+    const stream = &file.inStream().stream;
+
+    var buf: [20]u8 = undefined;
+    var sum1: i64 = 0; // part 1
+    var sum2: i64 = 0; // part 2
+
+    while (try stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        const mass = try std.fmt.parseInt(i64, line, 10);
+        var rock = rocket(mass);
+        sum1 += rock;
+        while (rock > 0) {
+            sum2 += rock;
+            rock = rocket(rock);
+        }
+    }
+
+    std.debug.warn("Part 1: {}\n", sum1);
+    std.debug.warn("Part 2: {}\n", sum2);
+}
+