1 files changed, 60 insertions, 0 deletions
diff --git a/day05.zig b/day05.zig
new file mode 100644
index 0000000..3a80a39
--- /dev/null
+++ b/day05.zig
@@ -0,0 +1,60 @@
+const std = @import("std");
+const data = @embedFile("day05");
+
+const Stack = std.BoundedArray(u8, 64);
+
+pub fn main() !void {
+    var lines = std.mem.split(u8, data, "\n");
+
+    var stacks = [_]Stack{try Stack.init(0)} ** 9;
+
+    while (lines.next()) |line| {
+        if (line.len == 0)
+            break;
+
+        for (stacks) |*stack, j| {
+            var c = line[1 + (j * 4)];
+            if (c != ' ') {
+                try stack.append(c);
+            }
+        }
+    }
+
+    for (stacks) |*stack| {
+        std.mem.reverse(u8, stack.slice());
+    }
+
+    var stacks2 = stacks;
+
+    while (lines.next()) |line| {
+        if (line.len == 0)
+            break;
+
+        var parts = std.mem.tokenize(u8, line, " ");
+        _ = parts.next();
+        var n = try std.fmt.parseInt(usize, parts.next().?, 10);
+        _ = parts.next();
+        var from = try std.fmt.parseInt(usize, parts.next().?, 10) - 1;
+        _ = parts.next();
+        var to = try std.fmt.parseInt(usize, parts.next().?, 10) - 1;
+
+        var j: usize = 0;
+        while (j < n) : (j += 1) {
+            try stacks[to].append(stacks[from].pop());
+        }
+
+        var f = stacks2[from].slice();
+        try stacks2[to].appendSlice(f[f.len - n .. f.len]);
+        try stacks2[from].resize(f.len - n);
+    }
+
+    for (stacks) |*stack| {
+        std.debug.print("{c}", .{stack.pop()});
+    }
+    std.debug.print("\n", .{});
+
+    for (stacks2) |*stack| {
+        std.debug.print("{c}", .{stack.pop()});
+    }
+    std.debug.print("\n", .{});
+}