Day 1

1 files changed, 31 insertions, 0 deletions

diff --git a/src/days/1/1.zig b/src/days/1/1.zig
new file mode 100644
index 0000000..6ec4a1c
--- /dev/null
+++ b/src/days/1/1.zig
@@ -0,0 +1,31 @@
+const std = @import("std");
+
+pub fn main() !void {
+
+    const buf = @embedFile("input");
+
+    var lines = std.mem.splitScalar(u8, buf, '\n');
+
+    var dial: i32 = 50;
+    var num_zeros: i32 = 0;
+    var num_zeros_p1: i32 = 0;
+
+
+    while (lines.next()) |line| {
+        if (line.len < 2) continue;
+
+        const num = try std.fmt.parseInt(i32, line[1.. line.len], 10);
+
+        const left_turn = line[0] == 'L';
+
+        if (dial == 0 and left_turn) num_zeros -= 1;
+        dial = if(left_turn) dial - num else dial + num;
+        const increment: i32 = @intCast(@abs(@divFloor(if(left_turn) dial-1 else dial,100)));
+        dial = @mod(dial,100);
+
+
+        num_zeros += increment;
+        if(dial == 0) num_zeros_p1 += 1;
+    }
+    std.debug.print("{} {}\n", .{num_zeros_p1, num_zeros});
+}