Finish day05, part 1

src/days/day05.zig

@@ -1,7 +1,59 @@
 const std = @import("std");
 
-pub const title = "Day 05";
+pub const title = "Day 05: Cafeteria";
 
-pub fn run(_: std.mem.Allocator) !void {
+pub fn run(allocator: std.mem.Allocator) !void {
+    const input = @embedFile("./input/day05.txt");
+    //const input =
+    //    \\3-5
+    //    \\10-14
+    //    \\16-20
+    //    \\12-18
+    //    \\
+    //    \\1
+    //    \\5
+    //    \\8
+    //    \\11
+    //    \\17
+    //    \\32
+    //    ;
+
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var ranges: std.ArrayList(Range) = .empty;
+    defer ranges.deinit(allocator);
+
+    var accumulator: u32 = 0;
+
+    outer: while (lines.next()) |line| {
+        var components = std.mem.tokenizeScalar(u8, line, '-');
+
+        const id_or_start_s = components.next() orelse continue;
+        const id_or_start = try std.fmt.parseUnsigned(u64, id_or_start_s, 10);
+        if (components.next()) |end_s| {
+            const end = try std.fmt.parseUnsigned(u64, end_s, 10);
+            try ranges.append(allocator, Range{ .start = id_or_start, .end = end });
+        } else {
+            for (ranges.items) |range| {
+                if (id_or_start >= range.start and id_or_start <= range.end) {
+                    accumulator += 1;
+                    continue :outer;
+                }
+            }
+        }
+    }
+
+    var buffer: [64]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("{d}\n", .{accumulator});
+
+    try stdout.flush();
 }
 
+const Range = struct {
+    start: u64,
+    end: u64,
+};
+