1 files changed, 39 insertions, 0 deletions
diff --git a/src/06/main.zig b/src/06/main.zig
new file mode 100644
index 0000000..b02576b
--- /dev/null
+++ b/src/06/main.zig
@@ -0,0 +1,39 @@
+const std = @import("std");
+const aoc = @import("aoc");
+
+fn part1(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
+    _ = args;
+
+    var entryit = std.mem.split(u8, input, "\n\n");
+    var answer: u32 = 0;
+    while (entryit.next()) |group| {
+        var seen = [_]u1{0} ** 256;
+        for (group) |c| {
+            if (c == ' ' or c == '\n') continue;
+            answer += @boolToInt(seen[c] == 0);
+            seen[c] = 1;
+        }
+    }
+
+    return try std.fmt.allocPrint(allocator, "{d}", .{answer});
+}
+
+fn part2(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
+    _ = args;
+
+    var entryit = std.mem.split(u8, input, "\n\n");
+    var answer: u32 = 0;
+    while (entryit.next()) |group| {
+        var count = [_]u16{0} ** 256;
+        var members: u16 = 0;
+        var memberit = std.mem.tokenize(u8, group, "\n ");
+        while (memberit.next()) |member| : (members += 1) {
+            for (member) |c| count[c] += 1;
+        }
+        for (count) |v| answer += @boolToInt(v == members);
+    }
+
+    return try std.fmt.allocPrint(allocator, "{d}", .{answer});
+}
+
+pub const main = aoc.main(part1, part2, .{ "6748", "3445" });