2022-13 in zig

4 files changed, 840 insertions, 0 deletions

diff --git a/2022/13-distress-signal/example b/2022/13-distress-signal/example
new file mode 100644
index 0000000..af73fbb
--- /dev/null
+++ b/2022/13-distress-signal/example
@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]
diff --git a/2022/13-distress-signal/first.zig b/2022/13-distress-signal/first.zig
new file mode 100644
index 0000000..3559e61
--- /dev/null
+++ b/2022/13-distress-signal/first.zig
@@ -0,0 +1,155 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+var allocator: std.mem.Allocator = undefined;
+
+pub fn main() anyerror!void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    allocator = arena.allocator();
+
+    try std.testing.expectEqual(try solve(example), 13);
+    const result = try solve(input);
+    try std.io.getStdOut().writer().print("{}\n", .{result});
+}
+
+const ListErrors = error{
+    OutOfMemory,
+};
+
+const List = struct {
+    data: std.ArrayList(Elt),
+    fn init(reader: anytype) !*List {
+        var l = try allocator.create(List);
+        l.data = std.ArrayList(Elt).init(allocator);
+        while (true) {
+            const c = reader.readByte() catch break;
+            switch (c) {
+                '[' => {
+                    var e = try l.data.addOne();
+                    e.* = Elt{ .list = try List.init(reader) };
+                },
+                ']' => {
+                    return l;
+                },
+                ',' => { // comma after a list ending, ignore
+                },
+                else => { // a digit
+                    var e = try l.data.addOne();
+                    e.* = Elt{ .int = c - '0' };
+                    while (true) {
+                        const d = reader.readByte() catch unreachable;
+                        if (d == ']') {
+                            return l;
+                        } else if (d == ',') {
+                            break;
+                        }
+                        e.int = e.int * 10 + d;
+                    }
+                },
+            }
+        }
+        return l;
+    }
+    fn initSingleton(n: u8) !*List {
+        var l = try allocator.create(List);
+        l.data = std.ArrayList(Elt).init(allocator);
+        var e = try l.data.addOne();
+        e.* = Elt{ .int = n };
+        return l;
+    }
+    fn isLowerThan(l: *List, o: *List) ListErrors!?bool {
+        var i: usize = 0;
+        while (true) : (i += 1) {
+            if (o.len() <= i) {
+                if (l.len() <= i) {
+                    return null;
+                }
+                return false;
+            }
+            if (l.len() <= i) {
+                return true;
+            }
+            const t = try l.data.items[i].isLowerThan(&(o.data.items[i]));
+            if (t != null) {
+                return t;
+            }
+        }
+    }
+    inline fn len(l: *List) usize {
+        return l.data.items.len;
+    }
+    fn print(l: *List) void {
+        for (l.data.items) |e| {
+            switch (e) {
+                Elt.int => |i| std.debug.print("{d} ", .{i}),
+                Elt.list => |o| {
+                    std.debug.print("[", .{});
+                    o.print();
+                    std.debug.print("]", .{});
+                },
+            }
+        }
+    }
+};
+
+const EltType = enum {
+    int,
+    list,
+};
+
+const Elt = union(EltType) {
+    int: u8,
+    list: *List,
+    fn isLowerThan(e: *Elt, f: *Elt) !?bool {
+        switch (e.*) {
+            Elt.int => |i| switch (f.*) {
+                Elt.int => |j| {
+                    if (i == j) {
+                        return null;
+                    }
+                    return i < j;
+                },
+                Elt.list => |o| {
+                    var l = try List.initSingleton(i);
+                    return l.isLowerThan(o);
+                },
+            },
+            Elt.list => |l| switch (f.*) {
+                Elt.int => |j| {
+                    f.* = Elt{ .list = try List.initSingleton(j) };
+                    return e.isLowerThan(f);
+                },
+                Elt.list => |o| {
+                    return l.isLowerThan(o);
+                },
+            },
+        }
+    }
+};
+
+fn solve(puzzle: []const u8) !u64 {
+    var it = std.mem.tokenize(u8, puzzle, "\n");
+    var i: usize = 1;
+    var tot: usize = 0;
+    while (it.next()) |line| {
+        var firstLine = std.io.fixedBufferStream(line);
+        var first = try List.init(firstLine.reader());
+        var secondLine = std.io.fixedBufferStream(it.next() orelse unreachable);
+        var second = try List.init(secondLine.reader());
+        const t = try first.isLowerThan(second);
+        //first.print();
+        //std.debug.print("\n", .{});
+        //second.print();
+        //std.debug.print("\n{d}: {?}\n", .{ i, t });
+        if (t) |s| {
+            if (s) {
+                tot += i;
+            }
+        }
+        i += 1;
+    }
+    return tot;
+}
diff --git a/2022/13-distress-signal/input b/2022/13-distress-signal/input
new file mode 100644
index 0000000..6d78e26
--- /dev/null
+++ b/2022/13-distress-signal/input
@@ -0,0 +1,449 @@
+[[[1,[1,6,0,10,10],[],5,[]],[3,[5,8],2,[3,6,5,7],8],4,[0,[10]],8],[7,7],[[3,[9,5,10],[3],8,10],2,3,9],[[8,[3,1,4,9,5]]],[[[],0],10,10,3]]
+[[],[[[2,1,2,9],[]],[[1,5,10],3]]]
+
+[[],[[1,[0,4,7,10,10],3,[6,2,0],[9,1,4]],[],[5,[0,8,5],0,10,[3,10,10]],2,2],[],[[[],10,[]],[3,3,[0,0,2,10],[7,8,6,4,6],6],[10,[8,2,4,2,0]]],[[[9,2,10],[5],1,5,[2,7,9]],[4,[6]],[[]],[4,[],[6,5]]]]
+[[6,[]],[[[1],[6,4,1,4],3],[4,4]],[[6,[2,2,9],5,[8,9,7,10]],6],[5,[[10,9,0,5,5],[10,6,6]],[[10,9,6],[0,0,3,1],[],5],7]]
+
+[[[4,[3,0,5,8,4],[5],7]],[[1,[3,9,10,3],6],7,2]]
+[[[]],[],[[[5,7,8,8],[3,1,6,3],[6,7],4],10,8,[5,7,[5,0],9,7],6],[7,[4],7,[8,5],5]]
+
+[[[],4,6],[0,3,2],[[5,[9,0,10,3,7]],[[5,6,7],[6,0]],9,[9]]]
+[[[[7,8,9,3,5],6,[2,6],[6,1,4,10,8]],3],[10],[[]]]
+
+[[2,8,[[8,3,1,5]],[[8,3],[1],[3],[],[5,8,8,9,4]]],[10],[],[6]]
+[[0,[[6],8,4],6,4],[[[10,2],[6,4,4,9],8,[]],[0,5,4,[4,2,0]],1],[[[0,3,8]],8,0],[]]
+
+[[5],[[],[[9,2,3,5,0],[1,2,7,5],5],0,[[4,8,10],[4,1],[9,1],3,10],3],[]]
+[[],[2,[8],[],[2,8,7,[]],[[],[9,10,1,10],[],[]]],[6,[1,[],10,[3,1,5,1,7]],[6,[10,1],[0,10,4],4]],[]]
+
+[[3,[[9,2,7],3,6,[6,9],[3,8,2,5,2]]],[],[[9,[5,8]],6,5,[[10]]]]
+[[2,[1,2],[[6]],[6,8,6]],[[],[2,4,[7]],[0,2,[],[0,7,10,7,7],[10,2,8]],10,[[3],[7,4,8],[7,6]]]]
+
+[[[[2,9],0,9,4],0,[[5,10],[0],5,[6,3]]]]
+[[[9,1,[]],[[7,9,9,5]],[[3,6,0,1]]],[1,3,1],[0,1,[],[[3]]]]
+
+[[6,6,[[5,8,6],[],[0,7],0]],[8]]
+[[0,6,[[0,3]]],[9,[0,7,5,5],[[3,8,2,5],1],4,[10,[4,3],2]],[0],[[6],[1],[6,[],[4,8,6,10,0]]],[2,8,[6,[8],[8,4]]]]
+
+[[7],[[],2,6],[3],[[5,[5,5,5,7],6],[6],1]]
+[[1,[3,[8,4,1,0,1]],6,5],[1,[[7],[8,7,5]],8,[[],5],8],[],[[8,[]],5,4],[8]]
+
+[[8]]
+[[],[],[[[7,3],[9,0,0,2]]],[[9,0,[6,3,2,0,1],5],3],[[],[10,9]]]
+
+[[[2,[10,10,9,6,7]],[5,1,3,7]],[[10],8,[[1,8,10,8,1],8,[1,2,4,7]]],[]]
+[[10],[6,[],6,[[10,1],7,[5,1,0]]],[[0,6,[4,5],[9,0],6],[]]]
+
+[[[],[],[]],[3]]
+[[[[]],10],[[[0,9,8,9,4],[4,1,5,4],[7,6],3],10,2,0],[[0,6]],[9,3]]
+
+[[],[[[9,4,8,1],0,8,[10,9]],[]],[[1,7,[5,9,3],8,5],3,[[8,9,10,2],7,[0,10,7],[8]],[5,[8,7,0,3,5],0],[9]]]
+[[3,7,10,[[9,1,8],[4,5,0],8,[2,7]],10]]
+
+[[[9,[5,10,3,5,1]],7,9]]
+[[9]]
+
+[[[[7,3,4,9,5],6,[4],4],[9,[9,9,3,4,6],5,8],[[1,6,8],[8,9,0,2],10]],[[],[4,[4,7]],3,[7,[],5,7]]]
+[[[[0,7,7]],[[4,6,4],[7],4]],[0],[[],[[4,3,1,10,4],[2,0,9]],0],[[[7,1,5,8,9]],5,7,8]]
+
+[[7,10,[5,[5,6,7],2,7],5,[[10,9],2]],[],[[8,[2,9,10],[10],[],[]],[]],[0,[9,0],[[],[4,2,10,6,5]],10]]
+[[[[3,0,10,3]]],[[6],10,[1,3,[],0],4,7],[4,[],9,[[3,5,4,9,10],[0,8,3,4],[3,9,8,9],[1]],1]]
+
+[[],[6,[7,5]],[6,6,3]]
+[[],[[2,3],5,6],[7,[]]]
+
+[[[],[1,[2]],4,10,[[],[],0,[3,6,10,4]]],[[1]]]
+[[7,[5,3,9,[10]]]]
+
+[[],[]]
+[[[10],8,9,[4,10,[9,6],[1,0,6,7,8]]],[2,0,[1,2,2,2,6],[5,[3,0,9]]]]
+
+[[4,0,4,2,[]],[0],[8,[8,[1,10],4,1],1,[5,6,2],2],[[5,2],0,3,[[8,4,6,9]]],[[[],9,[],9],[],[[2,5],[5,5,8,4],[4]],7,0]]
+[[],[10,[4,5,[3,2,10,0,0],[5,3,6]],1,[2]],[[7,[8,7,3,2]],[5,10,10],[4,[10,7,0,6,10]],8]]
+
+[[[[8]],3,[[2,1],1,4,8,[8]],8],[]]
+[[10,9,[[6,3],[9,7,3],[6,8]],2,[[]]],[[[],9,[1,6,3,10]],3,[1,10],0],[[[0,8,5,2],1,2,[7,4]],5,[0,[8,7,1,1],5,2,[6,1,8]],1,[1,[8],[3]]],[[10,[0,7,8],10,8],7,[[]],0,[]],[5,8,1,[[],9,[],[0]],[]]]
+
+[[[3,6,[7,10,0,2]]]]
+[[9,[[4,6,10]],1,6,[5,[8,5],5,10,10]],[[],9,1,[2,[5,3],2,[6]]],[4],[],[[0]]]
+
+[[[[7,3,5],[1]],2,[],4],[0],[9,[[4,2,5,9,6],2],[],[5,6]],[2]]
+[[3,5,6,[[5],10]],[[2,[8,0,2,5,9],[]],5]]
+
+[[[3],4],[[[2,1],[2,9,6]],[],0,4],[[[7],[7,3],0,8,9],[[10,9,10,6],[2,0,10,1]],9],[10]]
+[[[]],[[],8,[[],[5,0],0,2,[3,7,8]]],[3,0,1,2],[],[10,10]]
+
+[[[1,8,6,[9,5,6,6,3]],5,[[9,3,3,10],[8,0,1,9],9,[2]],8],[[[4,0,5],[4,10,7,4,0],9],4],[2],[3,[9,[],4],3,[[],0,7,6]],[]]
+[[[0,[]],4],[[4,[5,7,10,5,1],5],[[10]]]]
+
+[[[],[[10,8],[],[8,4]],1,0,[]],[[],[[2,0,8],4,9,7],[10,[0,8,4,9,5]],5]]
+[[[10,5,[2,7,8],2],[2],7,[]],[6,2],[3,7,7,[[9,3,5,8,4],[3,0,4],[10,9,4,8,8],[2,4,7],7]],[[]],[1,5,[[10,3,4,1,5],6,[],10]]]
+
+[[],[[[],[3,3,0],[4,0,5],[5]],[10,8,[2],[10,1,10,3],[10,7]],[[1,5,7,0],[8,5],10,8,[10,4,5,10]]],[7,[2,3,9,9]],[[8,[3,9,6]],[[8,8]],0]]
+[[8,[9,8,[6]],[[8,7]],[4,6]],[],[],[[0,3,[7,9,6,9,1]],[[],[7,6,2,2,0]]],[[],[[0,2,2,3,7],8,[3,10]],1,[8,0,[6]],6]]
+
+[[4,[1,9],0],[8,[2,[],[10,9,6,5],9,7],[[6,2,7,8],10,2,2,[0,10,2]],7]]
+[[],[0],[2,[],[6,2,[4,4],[10,10,3,2,10]],10],[8,[],[8,8],9,10],[[[4,9],[8],0,10]]]
+
+[[[[7],5,[4,2,5,6,6],[3,8,10,10,10],[10,10,9,7,9]],[6,9]],[2,[],[[2,2,9,2,10],[10,9],0,[5,7]]],[[7,2],7],[0,[7],[3,[]],6,3]]
+[[5]]
+
+[[[4,10],5]]
+[[],[[[],[1,7,10,1,9],2,0,2],2,0],[[],[[8,2,5,4,9],7,8,3,[2,7]],5,0]]
+
+[[10],[],[4,7,7,[[8],[1,8,8,6,10],[10,6,6],2],[4,[3,3,2,7,4],8,8,3]],[[9,[7,9,8,4],7],[[9,1,5,9,5]]]]
+[[[7],6,[3,6,9]],[10,5]]
+
+[[[2,[],9,6],4,4],[[[8,2,4],8,[8],[8,4,10]],[[7,6,4,10,9],6,6,3],10,[6,[10,2,3,8,7],4],6],[[],[],[3],[10],5]]
+[[4],[[],[[10,9],[0,8,3,5]]],[[[],[2,2,1,10,6]],0,[[1,8]],6],[2,[[10],[6,3],7,[1,3,10]]]]
+
+[[[],[[7,4,7,7]]],[7],[0,[]],[3]]
+[[0,[[6,5],[2],0,[],[5]]],[[1]],[]]
+
+[[[10,[7,7],[8,1,0,4,5],7],2,[[],[2,2,8,2],[5,0,9],5,[]],6,[[0,8,10],9,[5,5,6,8,0],[9]]]]
+[[3,[[],[4,9,4],6,[5,2,8]]]]
+
+[[[[3,2],2],6,[5,1,6,0],[],4],[[7],4,0,0,[[9,1],6,[8]]],[[6],1],[0,[[4,0]],2],[]]
+[[[5,9,5,[],3],[2,6,[0,2,4,4]],0,0,[]],[[[],8]]]
+
+[[[4,0,1,9],5,5]]
+[[2,3],[]]
+
+[[5,2,[[],[4,2,9,3]],[1,0,5],[7]],[[10,[3],[5],4],0,6,8,3],[9,[8,5],[4],3],[6,[],[8,9,5,[1,9,4,3,4],9],[2,10],8],[[[3,3,8,0]],8,4,[6,[1,5],[],[7,7]],5]]
+[[],[8,5,[9,[5,5,7]],[[9,0,3,1],5,8]],[[]]]
+
+[[],[[[6,2,9]],6],[[],[[]],8],[[[5,1],[0,8],10],[[],0,[4,8],[5],7]],[5,3,[9,[0],[],[3,10,3,6]],[7,3,0],[[1,10,8],7,[0]]]]
+[[[],[3,6,4,[10,7,1],9],7,[],[0,[9,2,3],[9]]],[0,[4,4,4,9,2],[[8,5,8,3,10],8,7,5],1,[[6,0],6,0,4]]]
+
+[]
+[[],[1,5,8,10,8]]
+
+[[8,7],[[9,4],10,5,2],[7,[[]],10,0,[10,4,[],[4,6,8],0]],[[[],[1,10,4,3],[1],10,[7,9,3,9]],[6,[9,8,7,0],6,[5,9,3,5,7],[8,3,4,1]],[10,7,9],9],[6,[[9,8],8,[2,6,4,9]]]]
+[[[[1],[6,9,6,4,0]],[5,[4]],9]]
+
+[[[[10,3,2,9,1],[1],7,2,2]]]
+[[5,[[],9,[6,0,9,7,2],1],[]],[[1,2,[6,6],[1,7,1]],7],[[7,[2,5,3]],[0],2],[5,9]]
+
+[[[7],[6],[3,2],[[3,5,2]],1],[[7],[[5,1,0,2],2,[5,7,2,4]],[[10],8]]]
+[[[[],[8,2,7,4,4],[10,8]],[3,[3],[4]]],[[0,[10,5,10,4]],[[],[7,8,10,10,3],6],3],[[[10,4],7,[4,0],[7,8,0,10]],[1],[2,2,3,[5,6,8]]],[8,10,[[3,1,8,8],5,9,1,[10,6]],[[4,7],5,[1,9,10,0,4],2]]]
+
+[[2,[4],9,[],[4,10]],[],[[[9],[0,0],[1,4,9,7],0],0,[[1,0,2],7,1],4,2]]
+[[[6,10],[3,2,[1,1,7],[1],7]],[2],[1],[]]
+
+[[],[4,[10],[[0,5,8,2,10],[],9,[0,3],[9,1]]],[9,1,8,[[1,10,8,3,4],[6,0,5,7,9],[2,10,3],3],6],[0,[10,[],2],5]]
+[[[[10,3,9,2,5],2,[],3],10],[[[7,3,8,9,10],5,6,6,[1]],10,3,4,[[1],10,7]],[[[1,8,4,2,10],6,9,0,[]]],[[5,9]]]
+
+[[[3,10,3,10]],[[6,7,[2,8,9,6,5]],6],[10],[6,[],[7,[8,9,4,2]]]]
+[[[[9,7],[2]],[5],[]],[[[4,7,7],7,0],7,[[8,0],[],[4,5,6,2],[]]]]
+
+[[]]
+[[10,[]],[1],[],[[[8]]]]
+
+[[[[5,0,4,10,0],5,[],[1]],[],[2],[[2,2,7,1,2],7,1,0,4],[10,[],5]],[[6,[5,9,6,3],3,9,[8,4,1,8]],[[3,3,8,3,0]],[6,[],0,[4,2],[]]]]
+[[3],[[4,[8,4,10],7],[6,[5,9,9,2,4],[9,1,7,0],[5,9,5,0]],[4,10,[],[8,8,7]],1,10]]
+
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+[[3,[]],[[],[9,9],0,8,[[8,8,1,5,6],[3,8,4,5,4]]],[[4,7,10,[7,2,0,0]],[[9]]]]
+
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+[[5,9,[1,[0,9,10]],[1,9],7],[7,6,[[6,9],0],8],[1],[[6,7,3]],[]]
+
+[[[8,4,[5,2]],0,[],8],[],[9],[[],[6,1,[3,0,7],1],[[9],7,[7],10]],[]]
+[[2,[[1,2,8,8],[]],2,4,6],[[7]],[9,[10,[10,1,3,3,3],[3,10,10],5,7],7],[],[]]
+
+[[10,1],[10,[[9],[9,1,5,9,5],[7,7,9,0],6]]]
+[[[4,[10],1,[0,1]]],[[[7],9],6,9,6,6]]
+
+[[6,[[],6,[7,8,8]]],[[1,3,[4,8,0,6],[1,10,3,9],10],[6,3],[9]],[],[[],[0,[10,3],[5],[7,5,10,5,2],[]],[4,8,3,[],[0]],[[5],[5,9]],[3,[5,2],[1,4,2]]]]
+[[[[1,7],3,0,[]]],[1,6,[5,[10,8,8],[]],[[6,10,2,5,7],6,[7,7,9],[6,4,8,8]],1],[5,[[10,10],3],[[],[2,10]],[1,1,[6,5,7],[10,5,2]],0]]
+
+[[7,[[7],9,[4,1,3,8],0,4],[1,4,[0,7,6,1,1]]],[0,[2,[3,9,7],10,5],[0,[9,4,2,5,3]]],[0,7],[[7,9,9,3,1],10,[],0]]
+[[2,[]],[4,0,5,7]]
+
+[[[8,7],[4,[7,2,2,8],[8,3,9,9],1,0]],[[[7,4,7,3,10],[1,4,1],[0,10],10,[0]]]]
+[[],[],[7]]
+
+[[1,[[5,7,2],[10],0,[8],[10,9,0,10,8]]]]
+[[],[2]]
+
+[[[10,[9,9,6,3],1,9]],[10,[4,[1,9]],[],[8]],[[3,7,[10,2]],[[],[1,3],2]]]
+[[8,6],[[5,0,10,[9]],[[1,5,8,4]],[[1,8,4,6],[4,7,6,2,0],[6,0],[6,3],[6,9,9,10]]]]
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+[[],[],[10,2,0],[[[3,8,7],[2,0]]],[3,5,5,1]]
+
+[[[[8,7],4,6,[10,7,9],[1,2]],3,[[5,5,5],4,[0],0]],[6,[[2,0,2,10,2],9],[8,0,[5,5,1,7,6],[2,5,2],[]]],[[[4,5,5],2,5,[4,8]]],[10,4],[[3,[],1,3],[],[3,[9,7,0,1]]]]
+[[[[9,9],9,6,8],3,[[],[],[10,8,6,7,6]],2],[[[0,5],4,7,[8,7,10],2],[[9,1],9,[4,9],6],2,5,[4,[7,6,6,4],3,8]],[[],[3,[7,7],1],10]]
+
+[[9,[0,3,[0,6,9]],[[7,1],[4,4,3,1,9],10],1,3]]
+[[8,7,8],[8,4,[]],[[[1],[4,9],[3]],6,8,[4,[6,3],[7],[1,0,10,7],10]],[2,2,0]]
+
+[[2,10,2],[],[[[2,6,8,7],2],[7,[]]],[7,[[4]],9],[1,[3,[10,2]]]]
+[[[],[]],[[3,5],[],10],[]]
+
+[[2,6,6]]
+[[8],[[4],[0,3,[]],[[8,6,0]],[10,10,8,1]],[[0,7],2,[0,10,[7,7,0,7,5],2],7],[[[2,5,7],6,4,10,2],7],[9]]
+
+[[[9,[7,3],[9,7],1]],[[7,[6,4],1],[0],7,[]],[5,7,[[9,10,10],[10,2]]]]
+[[8,[]],[[],[7,10,5,3,[5,8]],[],[[],4,2,8,[2,7,5,7,0]],[1,[9]]],[4,1,2,4,5]]
+
+[[3,4,[]],[],[3,8,5,[4]]]
+[[[5]],[],[],[[[3]],[[3,3,2,9,10],[0,6,5,7],9,2]]]
+
+[[],[6,[10]],[[5,8,[5,7,4]],5,5],[1,[4,4,[],3,[4,1]],[[5,1,2,7],[10,6],2],[[7],0,0,[7],[1,4]],[8]]]
+[[[[6,10,2],[],6,[5,1,1,1,1]],[8,2,[6,7],10,5],3],[6,[5,[9,4,3]]],[[[2,6,10],[0],9,9,[3]],9,5],[9,[9],[[4,4,10],10,6,[],[0,7]],[4,[8,1,9,5],[4]],[[0,3,7,7],[0,9,10,10]]]]
+
+[[[],5,[3,[],9,[8,10]],2,6],[1,[6,[],6,[10,7,7,6],[3,7]],5],[7,10,[[8],[9,6],[],3,5],[[],4,2,8]],[[8,[]]],[8]]
+[[9,4],[10,5],[[6,10,[0,1,1],0],7,4],[2,3,[7,8,1,1],6]]
+
+[[],[[1,[2,1],5,[],9],6,[9,4,8],[[5,1,7],[10,1,8],0]],[8,1,[[],2,[2,8]]],[[3,[2,3,0],8,6,[]],[8,4,[8],[10,7,2,2,0]],9,1,[1,[0,8,7,1],2]],[[9,5],[[1,2],[],10,7],2]]
+[[[10],6,7,4],[],[7,[0,9],[1,10,[0,10]],[[3,10],5,[9,9,8]]]]
+
+[[[5,[0,8,0]],[[6,3,2,3,5],[8,4]],1],[[[6,6,6,2],1,[2,2],2],9,6,2],[]]
+[[[],[],[[4,5],0],[10,6,7]],[[8,[9,8]]],[[[],[],3,7],[],0]]
+
+[[],[7,4],[[5],5],[[],1,10,[0,[5,0,1,10,6],[8],1,[4]],0],[0]]
+[[],[1,0,10],[]]
+
+[[3,2,[[7,9,4,8,2],2,[1,0,9,6],10,[3,0]]],[[9,6],[[]],1,[[],5,[5,4]],[2]],[],[8,[[6],2]],[[]]]
+[[0,[1],[],[[2]]],[[5,[1,0]],[[],2]],[4,[10,2,5],[[6,7,2,10,1],1,0,1]],[]]
+
+[[0,[],[[5,3,5,3,0],[],[3,8,0,0,1],[2]]],[]]
+[[[7,2],6,[8],[],[]]]
+
+[[[10],0,0,[[0,9]]],[[0,4],[[2,9,1,3]],9],[2,[[]],[7,[0,8],8]],[6,[[6,9],10,[],[4,2],[0]]]]
+[[8,[0,9]],[[2,6,8,[5],[8,1,1,9,4]],1,4],[[1,5],2]]
+
+[[[10,[],9,7,6]],[1],[],[[8],10,[9],[]]]
+[[[[9,7,7,7,0],[0,3,9,9,2],5],8,0,0],[],[[3,2,2,[2]],[2,[]],7],[[9,[7,8,9,9,10],[8,10]],6,10,[[]]],[]]
diff --git a/2022/13-distress-signal/second.zig b/2022/13-distress-signal/second.zig
new file mode 100644
index 0000000..e323138
--- /dev/null
+++ b/2022/13-distress-signal/second.zig
@@ -0,0 +1,213 @@
+const std = @import("std");
+
+const example = @embedFile("example");
+const input = @embedFile("input");
+
+var allocator: std.mem.Allocator = undefined;
+
+pub fn main() anyerror!void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    allocator = arena.allocator();
+
+    try std.testing.expectEqual(try solve(example), 140);
+    const result = try solve(input);
+    try std.io.getStdOut().writer().print("{}\n", .{result});
+}
+
+const ListErrors = error{
+    OutOfMemory,
+};
+
+const List = struct {
+    data: std.ArrayList(Elt),
+    fn addOne(l: *List) !*Elt {
+        return try l.data.addOne();
+    }
+    fn init(reader: anytype) !*List {
+        var l = try allocator.create(List);
+        l.data = std.ArrayList(Elt).init(allocator);
+        while (true) {
+            const c = reader.readByte() catch break;
+            switch (c) {
+                '[' => {
+                    var e = try l.data.addOne();
+                    e.* = Elt{ .list = try List.init(reader) };
+                },
+                ']' => {
+                    return l;
+                },
+                ',' => { // comma after a list ending, ignore
+                },
+                else => { // a digit
+                    var e = try l.data.addOne();
+                    e.* = Elt{ .int = c - '0' };
+                    while (true) {
+                        const d = reader.readByte() catch unreachable;
+                        if (d == ']') {
+                            return l;
+                        } else if (d == ',') {
+                            break;
+                        }
+                        e.int = e.int * 10 + d;
+                    }
+                },
+            }
+        }
+        return l;
+    }
+    fn initEmpty() !*List {
+        var l = try allocator.create(List);
+        l.data = std.ArrayList(Elt).init(allocator);
+        return l;
+    }
+    fn initSingleton(n: u8) !*List {
+        var l = try allocator.create(List);
+        l.data = std.ArrayList(Elt).init(allocator);
+        var e = try l.data.addOne();
+        e.* = Elt{ .int = n };
+        return l;
+    }
+    fn isLowerThan(l: *List, o: *List) ListErrors!?bool {
+        var i: usize = 0;
+        while (true) : (i += 1) {
+            if (o.len() <= i) {
+                if (l.len() <= i) {
+                    return null;
+                }
+                return false;
+            }
+            if (l.len() <= i) {
+                return true;
+            }
+            const t = try l.data.items[i].isLowerThan(&(o.data.items[i]));
+            if (t != null) {
+                return t;
+            }
+        }
+    }
+    inline fn len(l: *List) usize {
+        return l.data.items.len;
+    }
+    fn print(l: *List) void {
+        for (l.data.items) |e| {
+            switch (e) {
+                Elt.int => |i| std.debug.print("{d} ", .{i}),
+                Elt.list => |o| {
+                    std.debug.print("[", .{});
+                    o.print();
+                    std.debug.print("]", .{});
+                },
+            }
+        }
+    }
+};
+
+const EltType = enum {
+    int,
+    list,
+};
+
+const Elt = union(EltType) {
+    int: u8,
+    list: *List,
+    fn isLowerThan(e: *Elt, f: *Elt) !?bool {
+        switch (e.*) {
+            Elt.int => |i| switch (f.*) {
+                Elt.int => |j| {
+                    if (i == j) {
+                        return null;
+                    }
+                    return i < j;
+                },
+                Elt.list => |o| {
+                    var l = try List.initSingleton(i);
+                    return l.isLowerThan(o);
+                },
+            },
+            Elt.list => |l| switch (f.*) {
+                Elt.int => |j| {
+                    var ll = Elt{ .list = try List.initSingleton(j) };
+                    return e.isLowerThan(&ll);
+                },
+                Elt.list => |o| {
+                    return l.isLowerThan(o);
+                },
+            },
+        }
+    }
+};
+
+fn lesserThan(context: void, a: *Elt, b: *Elt) bool {
+    _ = context;
+    var tt = a.isLowerThan(b) catch unreachable;
+    if (tt) |t| {
+        if (t) {
+            return true;
+        }
+    }
+    return false;
+}
+
+fn solve(puzzle: []const u8) !u64 {
+    var it = std.mem.tokenize(u8, puzzle, "\n");
+    var list = std.ArrayList(*Elt).init(allocator);
+    var divider2Line = std.io.fixedBufferStream("[[2]]");
+    var div2 = try list.addOne();
+    div2.* = try allocator.create(Elt);
+    div2.*.* = Elt{ .list = try List.init(divider2Line.reader()) };
+    var divider6Line = std.io.fixedBufferStream("[[6]]");
+    var div6 = try list.addOne();
+    div6.* = try allocator.create(Elt);
+    div6.*.* = Elt{ .list = try List.init(divider6Line.reader()) };
+    // process input
+    while (it.next()) |line| {
+        var bs = std.io.fixedBufferStream(line);
+        var elt = try list.addOne();
+        elt.* = try allocator.create(Elt);
+        elt.*.* = Elt{ .list = try List.init(bs.reader()) };
+    }
+    // sort the list
+    std.sort.sort(*Elt, list.items, {}, lesserThan);
+    //for (list.items) |l| {
+    //    l.list.print();
+    //    std.debug.print("\n", .{});
+    //}
+    // compute output
+    var ret: usize = 1;
+    for (list.items) |l, i| {
+        switch (l.*) {
+            Elt.int => {},
+            Elt.list => |ll| {
+                if (ll.len() != 1) {
+                    continue;
+                }
+                switch (ll.data.items[0]) {
+                    Elt.int => {},
+                    Elt.list => |lll| {
+                        if (lll.len() != 1) {
+                            continue;
+                        }
+                        switch (lll.data.items[0]) {
+                            Elt.int => {},
+                            Elt.list => |llll| {
+                                if (llll.len() != 1) {
+                                    continue;
+                                }
+                                switch (llll.data.items[0]) {
+                                    Elt.int => |n| {
+                                        if (n == 2 or n == 6) {
+                                            ret *= (i + 1);
+                                        }
+                                    },
+                                    Elt.list => {},
+                                }
+                            },
+                        }
+                    },
+                }
+            },
+        }
+    }
+    return ret;
+}