From 17c6acf5a7c5e84a7888f304ba799e35fdc6bcce Mon Sep 17 00:00:00 2001 From: ame Date: Sun, 7 Dec 2025 01:09:57 -0600 Subject: day 7 --- src/day-7/part-1.zig | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/day-7/part-1.zig (limited to 'src/day-7/part-1.zig') diff --git a/src/day-7/part-1.zig b/src/day-7/part-1.zig new file mode 100644 index 0000000..327263c --- /dev/null +++ b/src/day-7/part-1.zig @@ -0,0 +1,40 @@ +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 beams = std.ArrayList(usize).init(alloc); + defer beams.deinit(); + + var splits: u64 = 0; + + while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| { + if(beams.items.len == 0){ + try beams.append(std.mem.indexOf(u8, line, "S").?); + continue; + } + + const ol: usize = beams.items.len; + for(0..ol) |i| { + if(line[beams.items[i]] == '^'){ + line[beams.items[i]] = 'i'; + splits += 1; + try beams.append(beams.items[i] + 1); + beams.items[i] -= 1; + } else if(line[beams.items[i]] == 'i'){ + beams.items[i] -= 1; + } + } + } + + std.debug.print("{d}\n", .{splits}); +} -- cgit v1.2.3