3 files changed, 702 insertions(+), 0 deletions(-)

A 2022/13/input
A 2022/13/solve.zig
M build.zig

@@ 0,0 1,450 @@
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+[[[[1,0,7,7],6,6],3]]
+
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+[[[[],[7],[],1,[1,6]],[7,7,[2]],10,[6],[6,7]],[8],[[0,[0,1,0]]],[[[],[8],7,[],10]]]
+
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+
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+
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+[[[],3],[4,3,3,[4,10,[7,10]]]]
+
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+
+[[],[[],2,[1,4,10,2,[1]],[4,5,10],2],[6,4,6,3]]
+[[],[7,[2,6],[[6,6,9,5]],5,10]]
+
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+
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+[[1,3,0],[4,9,1],[]]
+
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+
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+
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+[[1,6],[5,8,8,[[10,10,10],8,[6,1,8,9,2],[2,4,4],[10]]],[[],[],0]]
+
+[[0,0,6],[2,8],[7,[[5,8,2,7,8],7,[9,2,6]],[[6,2,1,7,7],10,6,[8]]],[]]
+[[[2,10,5,[],[6]]],[[],4,[5],3,3]]
+
+[[9,4],[]]
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+
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+[[[[5,0,0,0,1],5],[4,[9,5,10,0],[9,9,6,3],[]],[[5,1,5,8,0],[10],[5,9,6],7],[[],9,[0,8,8,1,2]],8],[],[6,[[1,4],1,7,[7,3,0]],9],[],[]]
+
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+[[0],[[[8],[6,2,1,4,10]]],[2]]
+
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+[[9,[[6,6],9]],[[],0,2,[[4,2],[5,3,0,3,7],0],[[5,7,3]]],[[1,5,[0,8,3,0],[],[7,4]]],[7,6,[[5,0],0]],[]]
+
+[[[[0,7,5,5,3],3,3,[10,9,2,10]],2],[[[0,3,8,7,1],[]]],[],[10,9]]
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+
+[[[0,3,5,[],6],[[5,5,0,7,2],[9,6,7],2],1]]
+[]
+
+[[3,2,[[0],[3,10,7],[8,9],10,[5,4]],[8,8,[4,2,9,4]],[[2,1,5],0,0,6]],[[[4]],[]],[]]
+[[],[2],[[9,[2,3,2,5],6,[10,2,10,10]],9,[]],[[7,5,[],1,8],[3,[],3,[7,1,3,3]],[1,[],7],[5,4]]]
+
+[[1,[9,4]],[0,9],[4,[[],[9,0],4,2,[1]]],[[],[4,[9,1,0,9],[1,9,5],3,[]],[[9,0,8],4,3],[7,5,4,6]],[[],[10,[0,1],[]],[1,[],[],1],[[9],2,0],5]]
+[[6,[7]],[[[]]],[9,[2,[3,1,9,5]]],[8,[[2,4,10]],[9,1,[3,0,6,7,10],2,4],[]],[3]]
+
+[[[6,10,[]],0,[7],6,2],[9,[10,[5,4,6,5],[0],0],2,6]]
+[[[[],[10,0],[2,1,7],[]],[8,1,10]],[],[4,[0,[0,9,4,3],[4,10],[8,2,5,4,1]],2]]
+
+[[[[7,5,8,9],6],[8,6,[10,7,9,5,2],[10,1,8]],3,10,8],[[[4,9,10,3,9],8],[[10,0,10,1],3,[8,0,4],[7,10,1,8],[9,9]],[3]],[[10,[10,2,6],1],[[8],[9,6,9,4],[2,9]],0]]
+[[],[7,[[3,0,3,7,3],[6,6,10,8,5],[],10],0,10,[[],3,[],5,[5,5,5,0]]],[[[0,8,6,7],[0,4,5,5,9]],[4,2],[[10,1,1,1,0],4,[],[3,6],[0,9]],0],[[8,2,2,6],[[1,9],9,[4]],6]]
+
+[[1,[[7,10]],10,6]]
+[[],[7],[5,7,10,[0,[9],[2],[4],6]],[9,3,6],[]]
+
+[[[2,[0,1,6,5],4,8]]]
+[[[[3],4]]]
+

@@ 0,0 1,251 @@
+const std = @import("std");
+const fs = std.fs;
+const sort = std.sort;
+const heap = std.heap;
+const io = std.io;
+const process = std.process;
+const math = std.math;
+const mem = std.mem;
+const testing = std.testing;
+
+const Packet = union(enum) {
+    value: u8,
+    list: struct {
+        father: ?*Packet = null,
+        list: std.ArrayListUnmanaged(Packet) = .{},
+    },
+
+    pub fn deinit(self: *Packet, alloc: mem.Allocator) void {
+        switch (self.*) {
+            .value => {},
+            .list => |*list| {
+                for (list.list.items) |*packet| packet.deinit(alloc);
+                list.list.deinit(alloc);
+            },
+        }
+    }
+
+    fn equalTo(self: Packet, other: Packet) bool {
+        return switch (self) {
+            .value => |lhs| switch (other) {
+                .value => |rhs| lhs == rhs,
+                .list => |list| blk: {
+                    if (list.list.items.len != 1) break :blk false;
+                    const first = list.list.items[0];
+                    break :blk switch (first) {
+                        .value => |rhs| lhs == rhs,
+                        .list => self.equalTo(first),
+                    };
+                },
+            },
+            .list => |lhs_list| switch (other) {
+                .value => |rhs| blk: {
+                    if (lhs_list.list.items.len != 1) break :blk false;
+                    const first = lhs_list.list.items[0];
+                    break :blk switch (first) {
+                        .value => |lhs| lhs == rhs,
+                        .list => first.equalTo(other),
+                    };
+                },
+                .list => |rhs_list| blk: {
+                    const lhs_len = lhs_list.list.items.len;
+                    const rhs_len = rhs_list.list.items.len;
+                    if (lhs_len != rhs_len) break :blk false;
+
+                    for (lhs_list.list.items) |lhs, i| {
+                        const rhs = rhs_list.list.items[i];
+                        if (!lhs.equalTo(rhs)) break :blk false;
+                    }
+                    break :blk true;
+                },
+            },
+        };
+    }
+
+    pub fn lessThan(_: void, self: Packet, other: Packet) bool {
+        return switch (self) {
+            .value => |lhs| switch (other) {
+                .value => |rhs| lhs < rhs,
+                .list => |list| blk: {
+                    const rhs_len = list.list.items.len;
+                    if (rhs_len == 0) break :blk false;
+
+                    const first = list.list.items[0];
+                    const equal = self.equalTo(first);
+                    if (equal) break :blk rhs_len > 1;
+                    break :blk switch (first) {
+                        .value => |rhs| lhs < rhs,
+                        .list => Packet.lessThan({}, self, first),
+                    };
+                },
+            },
+            .list => |lhs_list| switch (other) {
+                .value => |rhs| blk: {
+                    const lhs_len = lhs_list.list.items.len;
+                    if (lhs_len == 0) break :blk true;
+
+                    const first = lhs_list.list.items[0];
+                    const equal = first.equalTo(other);
+                    if (equal) break :blk false;
+                    break :blk switch (first) {
+                        .value => |lhs| lhs < rhs,
+                        .list => Packet.lessThan({}, first, other),
+                    };
+                },
+                .list => |rhs_list| blk: {
+                    const lhs_len = lhs_list.list.items.len;
+                    const rhs_len = rhs_list.list.items.len;
+                    const min_len = math.min(lhs_len, rhs_len);
+
+                    var i: usize = 0;
+                    while (i < min_len) : (i += 1) {
+                        const lhs = lhs_list.list.items[i];
+                        const rhs = rhs_list.list.items[i];
+                        if (lhs.equalTo(rhs)) continue;
+                        break :blk Packet.lessThan({}, lhs, rhs);
+                    }
+                    break :blk lhs_len < rhs_len;
+                },
+            },
+        };
+    }
+};
+
+const PacketParser = struct {
+    alloc: mem.Allocator,
+    packet: Packet = .{ .list = .{} },
+    current: ?*Packet = null,
+    number: ?u8 = null,
+
+    pub fn feed(self: *PacketParser, char: u8) !void {
+        switch (char) {
+            '[' => {
+                if (self.current) |current| {
+                    switch (current.*) {
+                        .value => @panic("current cannot be value"),
+                        .list => |*list| {
+                            const new = try list.list.addOne(self.alloc);
+                            new.* = .{ .list = .{ .father = current } };
+                            self.current = new;
+                        },
+                    }
+                } else {
+                    self.current = &self.packet;
+                }
+            },
+            ']' => {
+                if (self.current) |current| {
+                    switch (current.*) {
+                        .value => @panic("current cannot be value"),
+                        .list => |*list| {
+                            if (self.number) |number| {
+                                try list.list.append(self.alloc, .{ .value = number });
+                                self.number = null;
+                            }
+                            self.current = list.father;
+                        },
+                    }
+                } else {
+                    @panic("current must be set");
+                }
+            },
+            ',' => {
+                if (self.current) |current| {
+                    switch (current.*) {
+                        .value => @panic("current cannot be value"),
+                        .list => |*list| {
+                            if (self.number) |number| {
+                                try list.list.append(self.alloc, .{ .value = number });
+                                self.number = null;
+                            }
+                        },
+                    }
+                } else {
+                    @panic("current must be set");
+                }
+            },
+            else => {
+                const digit = char - '0';
+                if (self.number) |number| {
+                    self.number = number * 10 + digit;
+                } else {
+                    self.number = digit;
+                }
+            },
+        }
+    }
+
+    pub fn toOwned(self: *PacketParser) Packet {
+        const packet = self.packet;
+        self.* = .{ .alloc = self.alloc };
+        return packet;
+    }
+};
+
+pub fn main() !void {
+    const stdout = io.getStdOut().writer();
+
+    var gpa: heap.GeneralPurposeAllocator(.{}) = .{};
+    defer _ = gpa.deinit();
+    const alloc = gpa.allocator();
+
+    var args = process.args();
+    _ = args.next();
+    const filename = args.next() orelse @panic("error: missing input arg.");
+
+    const file = try fs.cwd().openFileZ(filename, .{});
+    defer file.close();
+
+    var parser: PacketParser = .{ .alloc = alloc };
+
+    var packets = std.ArrayList(Packet).init(alloc);
+    defer {
+        for (packets.items) |*packet| packet.deinit(alloc);
+        packets.deinit();
+    }
+
+    var count: usize = 0;
+    var i: usize = 0;
+    var buffer: [256]u8 = undefined;
+    while (try file.reader().readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        switch (i % 3) {
+            0, 1 => {
+                for (line) |char| try parser.feed(char);
+                const packet = parser.toOwned();
+                try packets.append(packet);
+            },
+            else => {
+                const len = packets.items.len;
+                const first = packets.items[len - 2];
+                const second = packets.items[len - 1];
+                if (!Packet.lessThan({}, second, first)) {
+                    count += (i + 1) / 3;
+                }
+            },
+        }
+        i += 1;
+    }
+    try stdout.print("result 1: {d}\n", .{count});
+
+    for ("[[2]]") |char| try parser.feed(char);
+    const divider1 = parser.toOwned();
+    try packets.append(divider1);
+
+    for ("[[6]]") |char| try parser.feed(char);
+    const divider2 = parser.toOwned();
+    try packets.append(divider2);
+
+    sort.sort(Packet, packets.items, {}, Packet.lessThan);
+
+    var index1: usize = 0;
+    var index2: usize = 0;
+    for (packets.items) |packet, j| {
+        if (packet.equalTo(divider1)) {
+            index1 = j;
+        } else if (packet.equalTo(divider2)) {
+            index2 = j;
+        }
+    }
+    const result2 = (index1 + 1) * (index2 + 1);
+    try stdout.print("result 2: {d}\n", .{result2});
+}

@@ 55,6 55,7 @@ pub fn build(builder: *Builder) !void {
         .{ .year = "2022", .day = "10" },
         .{ .year = "2022", .day = "11" },
         .{ .year = "2022", .day = "12" },
+        .{ .year = "2022", .day = "13" },
     };
 
     for (problems) |*problem| {