From b1bcf07c564298ac1bd1e87f9c7bbddb60fb1c62 Mon Sep 17 00:00:00 2001 From: ame Date: Mon, 1 Dec 2025 01:40:24 -0600 Subject: day 1 --- src/day-1/part-2.zig | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 src/day-1/part-2.zig (limited to 'src/day-1/part-2.zig') diff --git a/src/day-1/part-2.zig b/src/day-1/part-2.zig new file mode 100644 index 0000000..7d8e145 --- /dev/null +++ b/src/day-1/part-2.zig @@ -0,0 +1,44 @@ +const std = @import("std"); + +pub fn main() !void { + //var gpa = std.heap.GeneralPurposeAllocator(.{}){}; + //defer gpa.deinit(); + //const alloc = gpa.allocator(); + + const path = "input.txt"; + const fp = try std.fs.cwd().openFile(path, .{.mode = std.fs.File.OpenMode.read_only}); + defer fp.close(); + var reader = fp.reader(); + + var buffer: [256]u8 = undefined; + + var at: i32 = 50; + var z: u64 = 0; + + while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| { + const num = line[1..]; + + var spin = try std.fmt.parseInt(i32, num, 10); + const rem = @divFloor(spin, 100); + spin = @mod(spin, 100); + if(line[0] == 'L') spin = -spin; + const start = at; + at += spin; + + var over = false; + if(at < 0) { + at = 100 - -at; + over = true; + } + if(at > 99) { + at = at - 100; + over = true; + } + + if(over and start != 0) z += 1; + z += @intCast(rem); + if(!over and at == 0) z += 1; + //std.debug.print("{s} {d} {d} {d}\n", .{line, spin, at, z}); + } + std.debug.print("{d}\n", .{z}); +} -- cgit v1.2.3