diff --git a/benchmark.zig b/benchmark.zig
index 10c2f55..8429892 100644
--- a/benchmark.zig
+++ b/benchmark.zig
@@ -20,8 +20,12 @@ const d91 = @import("day9/part1.zig");
 const d92 = @import("day9/part2.zig");
 const d101 = @import("day10/part1.zig");
 const d102 = @import("day10/part2.zig");
+const d111 = @import("day11/part1.zig");
+const d112 = @import("day11/part2.zig");
+const d121 = @import("day12/part1.zig");
+const d122 = @import("day12/part2.zig");
 
-const NUMBER_OF_RUN = 1000;
+const NUMBER_OF_RUN = 50;
 
 var total_mean: i64 = 0;
 var total_min: i64 = 0;
@@ -62,6 +66,12 @@ pub fn main() !void {
     try benchmark(d101.main, 10, 1);
     try benchmark(d102.main, 10, 2);
     separator();
+    try benchmark(d111.main, 11, 1);
+    try benchmark(d112.main, 11, 2);
+    separator();
+    try benchmark(d121.main, 12, 1);
+    try benchmark(d122.main, 12, 2);
+    separator();
     print("| Total      | {d: >8} ± {d: <6.2} | {d:>8} | {d:>8} |\n", .{ total_mean, total_std_dev, total_min, total_max });
     separator();
 }
diff --git a/day11/part1.zig b/day11/part1.zig
new file mode 100644
index 0000000..cfb2a48
--- /dev/null
+++ b/day11/part1.zig
@@ -0,0 +1,114 @@
+const std = @import("std");
+const print = std.debug.print;
+const input = "890 0 1 935698 68001 3441397 7221 27";
+const numberT = u64;
+
+// Passed to a weird while loop instead of recurcive function because I run into limitation, too much recursion :/
+
+const Stone = struct {
+    number: numberT,
+    next: ?*Stone = null,
+
+    fn step(self: *Stone, allocator: std.mem.Allocator) !void {
+        var current = self;
+        while (true) {
+            if (current.number == 0) {
+                current.number = 1;
+                if (current.next) |right_stone| {
+                    current = right_stone;
+                } else {
+                    break;
+                }
+            } else if (digitCount(current.number) % 2 == 0) {
+                const new_value = splitNumber(current.number);
+                const new_stone = try allocator.create(Stone);
+                new_stone.* = Stone{ .number = new_value[1], .next = current.next };
+                current.number = new_value[0];
+                current.next = new_stone;
+                if (new_stone.next) |right_stone| {
+                    current = right_stone;
+                } else {
+                    break;
+                }
+            } else {
+                current.number *= 2024;
+                if (current.next) |right_stone| {
+                    current = right_stone;
+                } else {
+                    break;
+                }
+            }
+        }
+    }
+
+    fn printStone(self: Stone) void {
+        print("{d} ", .{self.number});
+        if (self.right) |right_stone| {
+            right_stone.printStone();
+        } else {
+            print("\n", .{});
+        }
+    }
+
+    fn count(self: *Stone, total: *usize) void {
+        var current = self;
+        while (true) {
+            total.* += 1;
+            if (current.next) |right_stone| {
+                current = right_stone;
+            } else {
+                break;
+            }
+        }
+    }
+};
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+
+    var iter = std.mem.splitAny(u8, input, " ");
+    const first_stone = try allocator.create(Stone);
+    first_stone.* = Stone{ .number = try std.fmt.parseInt(numberT, iter.next().?, 10) };
+
+    var last_stone = first_stone;
+    while (iter.next()) |number| {
+        const new_stone = try allocator.create(Stone);
+        new_stone.* = Stone{ .number = try std.fmt.parseInt(numberT, number, 10) };
+        last_stone.next = new_stone;
+        last_stone = new_stone;
+    }
+
+    for (0..25) |_| try first_stone.step(allocator);
+
+    var total: usize = 0;
+    first_stone.count(&total);
+    try std.testing.expectEqual(194782, total);
+}
+
+fn digitCount(num: numberT) usize {
+    if (num == 0) return 1;
+
+    var n = num;
+    var count: usize = 0;
+    while (n != 0) : (n = @divFloor(n, 10)) {
+        count += 1;
+    }
+    return count;
+}
+
+fn splitNumber(num: numberT) [2]numberT {
+    const numDigits = digitCount(num);
+    const halfDigits = numDigits / 2;
+
+    var divisor: numberT = 1;
+    for (halfDigits) |_| {
+        divisor *= 10;
+    }
+
+    const left = @divFloor(num, divisor);
+    const right = num % divisor;
+
+    return [2]numberT{ left, right };
+}
diff --git a/day11/part2.zig b/day11/part2.zig
new file mode 100644
index 0000000..d286777
--- /dev/null
+++ b/day11/part2.zig
@@ -0,0 +1,49 @@
+const std = @import("std");
+
+pub fn main() !void {
+    var map = std.AutoHashMap(usize, usize).init(std.heap.page_allocator);
+    defer map.deinit();
+
+    for ([_]usize{ 890, 0, 1, 935698, 68001, 3441397, 7221, 27 }) |n| try map.put(n, (map.get(n) orelse 0) + 1);
+
+    for (0..75) |_| try step(&map);
+    try std.testing.expectEqual(233007586663131, countStone(map));
+}
+
+fn step(map: *std.AutoHashMap(usize, usize)) !void {
+    var old_map = try map.clone();
+    defer old_map.deinit();
+
+    map.clearRetainingCapacity();
+    var iter = old_map.iterator();
+    while (iter.next()) |entry| {
+        if (entry.key_ptr.* == 0) {
+            try map.put(1, (map.get(1) orelse 0) + entry.value_ptr.*);
+        } else if (countDigit(entry.key_ptr.*) % 2 == 0) {
+            const splits = splitDigit(entry.key_ptr.*);
+            try map.put(splits[0], (map.get(splits[0]) orelse 0) + entry.value_ptr.*);
+            try map.put(splits[1], (map.get(splits[1]) orelse 0) + entry.value_ptr.*);
+        } else {
+            try map.put(entry.key_ptr.* * 2024, (map.get(entry.key_ptr.* * 2024) orelse 0) + entry.value_ptr.*);
+        }
+    }
+}
+
+fn countDigit(number: usize) usize {
+    var n: usize = number;
+    var count: usize = 0;
+    while (n != 0) : (count += 1) n = @divFloor(n, 10);
+    return count;
+}
+
+fn splitDigit(number: usize) [2]usize {
+    const divider = std.math.pow(usize, 10, (countDigit(number) / 2));
+    return [2]usize{ @divFloor(number, divider), number % divider };
+}
+
+fn countStone(map: std.AutoHashMap(usize, usize)) usize {
+    var total: usize = 0;
+    var iter = map.valueIterator();
+    while (iter.next()) |entry| total += entry.*;
+    return total;
+}
diff --git a/day12/input b/day12/input
new file mode 100644
index 0000000..3a2ca2e
--- /dev/null
+++ b/day12/input
@@ -0,0 +1,140 @@
+RRRRRRRRRRRRRRRRKKKKKKKKRRRRRRRRRRRRRRRRRRRROOPOOOOOOOOGOOONYYYYYYEDDDDDDDDDDDLLLLLLLLOOOOOOOOOOOOOOOXVVXHHHHHHHHHHLLLLLLLLLLLLLLJJJJJJJJJJC
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+RRRRRRRRRRRRRRKKKKKKKKKKRRRRRRRRRRRRRRRRRRRRROOOOOOOOOOOOOOYYYYYYKEDDDDDDDDDILLLLLLLLLLLOOOOOOOOOOOOOOXXXXXXXHHHHHLLLLLLLLLLLLLJJJJJJJJJJJJC
+RRRRRRRRRRRRKKKKKKKKKKKKKRRRRRRRRRRRRRRRRRRRROOOOOOOOOOOOOOOOYYYYKDDDDDDDDDDIILLLLLLLLLLOOOOOOOOOOOOOOXXXXXXXHHHHHLLLLLLLLLLLLLLJJJJJJJJJJJC
+RRRRRRRRRRRRKKKKKKKKKKKKKERREREERRRRRMMMRRRROOOOOOOOOOOOOOOOYYYYYKKDDDDDDDDDDDDLLLLLLLLOOOOOOOOOOOOOOOXXXXXXXHHHHLLLLLLLLLLLLLLJJJJJJJJJJAAA
+RRRRRRRRRRRKKKKKKKKKKKKKKEEEEEBEERRRRRMRRRRROOOOOOOOOOOOOOQQQYYYKKKKDDDDDDDDDDDDLLLLLLOOOOOOOOOOOOOXXXXXXXXXXHLLLLLLLLLLLLLLLLLJLJJJJJJAAAAA
+RRRRRRSRRRRKKJKKKKKKKKKKKKEEEEEEEERCRMMMMRROOOOOOOOOOOOOQQQQQYYYKKKKDDDDDDDDDDDDLLLLLLOOOOOOOOOOOOXXXXXXXXXXXXTTLLLLLLLLLLLLLLLLLLJJJJAAAAAA
+RSRRRRSSRRRRRJKKLKKKKKHHKKEEEEEEEECCCWWCCRROOOOOOTOOTOOOQQQQQYQKKKKDDDDDDDDDRDDDDRLLLLLLOOOOOOOOOOXXXXXXXXXXXXXTLLLLLLLLLLLLLLLLLJJJAAAAAAAA
+SSSSSSSRRRRRRRRKKKKKKKHHEEEEEEEEEECCCCCCCCROOOOOOTOTTOTQQQQQQYQQKKKEEEDDDDDDRRRRRRLRLLLLOOOOOOOOCCXXXXXXXXXXXXXXLLLLLWLLLPPLPLLLLJJAAAAAAAAA
+SSSSSSSSSSRRRRKKKKKKOTHHHHEEEEEEECCCCCCCCCRROOOTTTTTTTTQQQQQQQQKKKEEEEEDEERRRRRRRRRRRRROOOOOOOOOCXXXXXXXXXXXXXXLLLLLLLLLLLPPPLLLLJJJAAAAAAAA
+SASSSSSSSSRRRRKKKKKKTTTTTHEEEEOOCCCCCCCNNCRRRROTTTTTTTQQQQQQQQQKKKAEEEEEEERRRRRRRRRRRROOSOOOOOOOCCXXXXXXXXXXXXXXLLLLLLLQLLPPPLLQQAAAAAAAAAAA
+SSSSSSSSSSSSRRKKKKKKKTTTTTODEEDOCCCCCCCCCRRRRRKKTTTTTTQQQQQQQQQKAAAELLEEEEERRRRRRRRRRRRSSSSOOOOCCXXDXXXXXXXXXXXXLLLLLLLQQPPHQLLQQAAAAAAAAAAA
+SSSSSSSSSSSRRRKKKKKKTTTTTTODDDDOCWCCCCCTTTRRRRRRTTTTTTQQQQQQQQTKAAALLLLEEEERRRRRRRRRRRSSSSSSSSOCCCCDXXXXXXLLXXXLLLLLLLLLQQPHQQLQQAAAAAAAAAAA
+SSSSSSSSSSUUZZZKKKKKKTTTTTDDDDDDWWCCCTTTTRRRRHRUUTTTTTWWQQQQQTTTTLLLLLLWLEERRRRRRRRRRRBSSSSSSSCCCCCDXSSXXLLLLLLLLLLLLLLQQQPQQQQQQQAAAAAAAAAA
+SSSSSSSSSSZZZZZZZZKKKTTTTDDDDDDWWWRCCTTTRRRRUUUUUTTZTTWWWWWQQQQTHLLLLLLLLEERRRRRRRRRRRRKSSSSSSCCJCCDDDDXXXLLLLLLJJLLLLLQQQQQQQQQQQAAAAAAAAAA
+SAQQSSSSSSQZZZZZZKKTTTTTTDDDDDRRRRRRRTTURURUUUUUUZZZTTWWWWWWQQQLLLLLLLLQLEERRRRRRRRRRRUSSSSSSSSJJJJDDDDXEXLLLLJJJJJEJJQQQQQQQQQQQQQAAAAAAAAA
+QQQQQSQQQQQZZZZGGKTTTTTTTTTDRRRRRRRRUUUUUUUUUUUUUZZVWTWWWWWWLQQQLLLLLPPEEEERRRRRRRRRRRUUSSSSSWSJJJJRRRRQRXLLLLJJJJJJJJJQQQQQQYQQQQQQAAAABBAA
+QQQQQQQQZZZZZZZGGGGGTTTTTTTTRNRRRRRRUUUUUUUUUUUUZZZVWTWWWWWWWWWWWLLLLLPPEEEEEEEEEEURUUUUSSSSSSJJJJJRRRRRRRRLLLJJJJJJJJBBBQQQYYYQQQAAAABBBAAA
+QQQQQQQKKKKZZZZGGGGGTTTTTTTTTTTRRRRRRRURUUUUUUCUZZVVWWWWWWWWWWWWWLLLLLLLEEEEEEENNUUUUUUUUSSSSSSJJJRRRRRRWRCRLJJJJJJJJJJJJBBQQYQQQQQQAAAABAAA
+QQQQQQQQQQQZZZZSSSSSSSSTTTTTTTTRRRRRRRRRRUUUUUCCVVVVVWWWWWWWWWWWLLLLLLLLEEEEEEENNUUUUUUUUSSISSJJJJJRRRRRRRRRRJJJJJJJJJJJJQQQYYYXXXQAAXXXXAAA
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+QQQQQQQQQQQHLLLSSSSSSSSTTTTTTTWWWWWRRRROOOUCCCCCVVWWWWWWWWWWLLLOLGLLLLLLLLEEEEENNUNUUUUUUUUSJJJJJJJRRRRRRRRRRCCJJJJJJJYYYYQQQQYXXXXXXXXXXXGA
+QQQQQQQQQQQQLLLSSSSSSSSSSTVSSSWWWWWRROROOUUCCCCCVVWWWWWWWLLLLOOOLLLLLLLLLLLEEEENNNNNUUWWUWUJJJJJJJJJRRRRRRRRRRJJJJJMMJYYYYQQQYYYXXXXXXXXXXXX
+QQQQQQQQQQQQLLLSSSSSSSSSSVVSSSWWWWWRROOOOPCCCCCCNVWWWWWWWLLLLLOOOOOLLLLLLLEEEENNNNNNUUUWWWWWFJJJJJOOORRRRRRRRRJMMMJMMMYYYYYQYYYYXXXXXXXXXXXX
+QQQQQQQQQKQLLLNSSSSSSSSSSVVSSSWWWWWRRRROPPCCCCCNNWWWWWWWWLLLLLOOOOOOLLLLLLEEEENNNNNNNUWWWWWFFJFJJJOOORRRRRRRRRJMMMMMMYYYYYYYYYYXXXXXXXXXXXXX
+QQPQQQQQQQQLLLLSSSSSSSSSSRRSSSSDWWWRRRRPPPCCCNCNNNWWWWWWWLLLLLLOOOOOOOOLLEEEEEENNUUUNNWWWWWFFFFGGGOOORGRRIIMMMMMMMMMMMYYYYYYYYXXXXXXXXXXXXXF
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diff --git a/day12/part1.zig b/day12/part1.zig
new file mode 100644
index 0000000..e8a0904
--- /dev/null
+++ b/day12/part1.zig
@@ -0,0 +1,160 @@
+const std = @import("std");
+const print = std.debug.print;
+const input = @embedFile("input");
+const MAP_SIZE = 140;
+
+const Area = struct {
+    positions: *std.AutoHashMap([2]usize, void),
+    char: u8,
+    perimeter: usize = 0,
+    area: usize = 0,
+
+    fn init(allocator: std.mem.Allocator, char: u8) !Area {
+        const positions = try allocator.create(std.AutoHashMap([2]usize, void));
+        positions.* = std.AutoHashMap([2]usize, void).init(allocator);
+        return Area{
+            .positions = positions,
+            .char = char,
+        };
+    }
+};
+
+const Map = struct {
+    allocator: std.mem.Allocator,
+    map: [MAP_SIZE + 2][MAP_SIZE + 2]u8 = undefined,
+
+    areas: *std.ArrayList(Area),
+    area_search_x: usize = 0,
+    area_search_y: usize = 0,
+
+    fn init(allocator: std.mem.Allocator) !Map {
+        const areas = try allocator.create(std.ArrayList(Area));
+        areas.* = std.ArrayList(Area).init(allocator);
+        return Map{
+            .allocator = allocator,
+            .areas = areas,
+        };
+    }
+
+    fn printMap(self: Map) void {
+        for (0..MAP_SIZE + 2) |x| {
+            print("\n", .{});
+            for (0..MAP_SIZE + 2) |y| print("{c}", .{self.map[x][y]});
+        }
+        print("\n", .{});
+    }
+
+    fn printPos(self: Map, x: usize, y: usize) void {
+        for (0..MAP_SIZE + 2) |x2| {
+            print("\n", .{});
+            for (0..MAP_SIZE + 2) |y2| {
+                if (x == x2 and y == y2) {
+                    print("{c}", .{self.map[x][y]});
+                } else {
+                    print(".", .{});
+                }
+            }
+        }
+        print("\n", .{});
+    }
+
+    fn printAreas(self: Map) void {
+        for (self.areas.items) |area| {
+            print("Region {c} with Perimeter: {d}; and Area: {d}\n", .{ area.char, area.perimeter, area.area });
+        }
+    }
+
+    fn printAreasOneByOne(self: Map) !void {
+        for (self.areas.items) |area| {
+            clearScreen();
+            print("Region {c} with Perimeter: {d}; and Area: {d}\n", .{ area.char, area.perimeter, area.area });
+            for (0..MAP_SIZE + 2) |x| {
+                print("\n", .{});
+                for (0..MAP_SIZE + 2) |y| {
+                    if (area.positions.contains([2]usize{ x, y })) {
+                        print("{c}", .{self.map[x][y]});
+                    } else {
+                        print(".", .{});
+                    }
+                }
+            }
+            print("\n", .{});
+            try waitForInput();
+        }
+    }
+
+    fn setInput(self: *Map) void {
+        for (input, 0..) |c, i| {
+            if (c == '\n') continue;
+            self.map[@divFloor(i, MAP_SIZE + 1) + 1][i % (MAP_SIZE + 1) + 1] = c;
+        }
+    }
+
+    fn set(self: *Map, char: u8) void {
+        for (0..MAP_SIZE + 2) |x| for (0..MAP_SIZE + 2) |y| {
+            self.map[x][y] = char;
+        };
+    }
+
+    fn posInArea(self: Map, x: usize, y: usize) bool {
+        for (self.areas.items) |area| {
+            if (area.positions.contains([2]usize{ x, y })) return true;
+        }
+        return false;
+    }
+
+    fn populateAreas(self: *Map) !void {
+        for (1..MAP_SIZE + 1) |x| for (1..MAP_SIZE + 1) |y| {
+            if (self.posInArea(x, y)) continue;
+            try self.areas.append(try Area.init(self.allocator, self.map[x][y]));
+            try self.lookAround(x, y);
+        };
+    }
+
+    fn lookAround(self: *Map, x: usize, y: usize) !void {
+        self.checkBorder(x, y);
+        self.areas.items[self.areas.items.len - 1].area += 1;
+        try self.areas.items[self.areas.items.len - 1].positions.put([2]usize{ x, y }, {});
+        if (self.map[x - 1][y] != '.' and self.map[x - 1][y] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x - 1, y })) try self.lookAround(x - 1, y);
+        if (self.map[x + 1][y] != '.' and self.map[x + 1][y] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x + 1, y })) try self.lookAround(x + 1, y);
+        if (self.map[x][y - 1] != '.' and self.map[x][y - 1] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x, y - 1 })) try self.lookAround(x, y - 1);
+        if (self.map[x][y + 1] != '.' and self.map[x][y + 1] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x, y + 1 })) try self.lookAround(x, y + 1);
+    }
+
+    fn checkBorder(self: *Map, x: usize, y: usize) void {
+        if (self.map[x + 1][y] != self.map[x][y]) self.areas.items[self.areas.items.len - 1].perimeter += 1; //Down
+        if (self.map[x - 1][y] != self.map[x][y]) self.areas.items[self.areas.items.len - 1].perimeter += 1; //Down
+        if (self.map[x][y - 1] != self.map[x][y]) self.areas.items[self.areas.items.len - 1].perimeter += 1; //Left
+        if (self.map[x][y + 1] != self.map[x][y]) self.areas.items[self.areas.items.len - 1].perimeter += 1; //Right
+    }
+
+    fn calculPrice(self: Map) usize {
+        var total: usize = 0;
+        for (self.areas.items) |area| {
+            total += area.perimeter * area.area;
+        }
+        return total;
+    }
+};
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+
+    var map = try Map.init(allocator);
+    map.set('.');
+    map.setInput();
+    try map.populateAreas();
+    try std.testing.expectEqual(1375476, map.calculPrice());
+}
+
+fn clearScreen() void {
+    print("\x1B[2J\x1B[H", .{});
+}
+
+fn waitForInput() !void {
+    var buf: [5]u8 = undefined;
+    const stdin = std.io.getStdIn().reader();
+    _ = try stdin.readUntilDelimiter(&buf, '\n');
+}
diff --git a/day12/part2.zig b/day12/part2.zig
new file mode 100644
index 0000000..caf9ba7
--- /dev/null
+++ b/day12/part2.zig
@@ -0,0 +1,225 @@
+const std = @import("std");
+const print = std.debug.print;
+const input = @embedFile("input");
+const MAP_SIZE = 140;
+
+const Direction = enum { UP, DOWN, LEFT, RIGHT };
+
+const Side = struct {
+    start: [2]usize,
+    end: [2]usize,
+    direction: Direction,
+};
+
+const Area = struct {
+    positions: *std.AutoHashMap([2]usize, void),
+    sides: *std.ArrayList(Side), // start and end point
+    char: u8,
+    area: usize = 0,
+
+    fn isInSide(self: Area, x: usize, y: usize, direction: Direction) bool {
+        for (self.sides.items) |side| {
+            if (direction != side.direction) continue;
+
+            if (side.start[0] == side.end[0] and side.start[0] == x and side.start[1] <= y and y <= side.end[1]) return true;
+            if (side.start[1] == side.end[1] and side.start[1] == y and side.start[0] <= x and x <= side.end[0]) return true;
+        }
+        return false;
+    }
+
+    fn init(allocator: std.mem.Allocator, char: u8) !Area {
+        const positions = try allocator.create(std.AutoHashMap([2]usize, void));
+        positions.* = std.AutoHashMap([2]usize, void).init(allocator);
+        const sides = try allocator.create(std.ArrayList(Side));
+        sides.* = std.ArrayList(Side).init(allocator);
+        return Area{
+            .positions = positions,
+            .sides = sides,
+            .char = char,
+        };
+    }
+};
+
+const Map = struct {
+    allocator: std.mem.Allocator,
+    map: [MAP_SIZE + 2][MAP_SIZE + 2]u8 = undefined,
+
+    areas: *std.ArrayList(Area),
+    area_search_x: usize = 0,
+    area_search_y: usize = 0,
+
+    fn init(allocator: std.mem.Allocator) !Map {
+        const areas = try allocator.create(std.ArrayList(Area));
+        areas.* = std.ArrayList(Area).init(allocator);
+        return Map{
+            .allocator = allocator,
+            .areas = areas,
+        };
+    }
+
+    fn setInput(self: *Map) void {
+        for (input, 0..) |c, i| {
+            if (c == '\n') continue;
+            self.map[@divFloor(i, MAP_SIZE + 1) + 1][i % (MAP_SIZE + 1) + 1] = c;
+        }
+    }
+
+    fn set(self: *Map, char: u8) void {
+        for (0..MAP_SIZE + 2) |x| for (0..MAP_SIZE + 2) |y| {
+            self.map[x][y] = char;
+        };
+    }
+
+    fn posInArea(self: Map, x: usize, y: usize) bool {
+        for (self.areas.items) |area| {
+            if (area.positions.contains([2]usize{ x, y })) return true;
+        }
+        return false;
+    }
+
+    fn populateAreas(self: *Map) !void {
+        for (1..MAP_SIZE + 1) |x| for (1..MAP_SIZE + 1) |y| {
+            if (self.posInArea(x, y)) continue;
+            try self.areas.append(try Area.init(self.allocator, self.map[x][y]));
+            try self.lookAround(x, y);
+        };
+    }
+
+    fn lookAround(self: *Map, x: usize, y: usize) !void {
+        try self.checkSide(x, y);
+        self.areas.items[self.areas.items.len - 1].area += 1;
+        try self.areas.items[self.areas.items.len - 1].positions.put([2]usize{ x, y }, {});
+        if (self.map[x - 1][y] != '.' and self.map[x - 1][y] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x - 1, y })) try self.lookAround(x - 1, y);
+        if (self.map[x + 1][y] != '.' and self.map[x + 1][y] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x + 1, y })) try self.lookAround(x + 1, y);
+        if (self.map[x][y - 1] != '.' and self.map[x][y - 1] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x, y - 1 })) try self.lookAround(x, y - 1);
+        if (self.map[x][y + 1] != '.' and self.map[x][y + 1] == self.map[x][y] and !self.areas.getLast().positions.contains([2]usize{ x, y + 1 })) try self.lookAround(x, y + 1);
+    }
+
+    fn checkSide(self: *Map, x: usize, y: usize) !void {
+        if (self.map[x + 1][y] != self.map[x][y] and !self.areas.getLast().isInSide(x, y, .DOWN)) try self.addSide(x, y, .DOWN);
+        if (self.map[x - 1][y] != self.map[x][y] and !self.areas.getLast().isInSide(x, y, .UP)) try self.addSide(x, y, .UP);
+        if (self.map[x][y - 1] != self.map[x][y] and !self.areas.getLast().isInSide(x, y, .LEFT)) try self.addSide(x, y, .LEFT);
+        if (self.map[x][y + 1] != self.map[x][y] and !self.areas.getLast().isInSide(x, y, .RIGHT)) try self.addSide(x, y, .RIGHT);
+    }
+
+    fn addSide(self: *Map, x: usize, y: usize, direction: Direction) !void {
+        var start_x: usize = x;
+        var start_y: usize = y;
+
+        var end_x: usize = x;
+        var end_y: usize = y;
+
+        switch (direction) {
+            .UP => {
+                while (self.map[x][start_y - 1] == self.map[x][y] and self.map[x - 1][start_y - 1] != self.map[x][y]) start_y -= 1;
+                while (self.map[x][end_y + 1] == self.map[x][y] and self.map[x - 1][end_y + 1] != self.map[x][y]) end_y += 1;
+            },
+            .DOWN => {
+                while (self.map[x][start_y - 1] == self.map[x][y] and self.map[x + 1][start_y - 1] != self.map[x][y]) start_y -= 1;
+                while (self.map[x][end_y + 1] == self.map[x][y] and self.map[x + 1][end_y + 1] != self.map[x][y]) end_y += 1;
+            },
+            .LEFT => {
+                while (self.map[start_x - 1][y] == self.map[x][y] and self.map[start_x - 1][y - 1] != self.map[x][y]) start_x -= 1;
+                while (self.map[end_x + 1][y] == self.map[x][y] and self.map[end_x + 1][y - 1] != self.map[x][y]) end_x += 1;
+            },
+            .RIGHT => {
+                while (self.map[start_x - 1][y] == self.map[x][y] and self.map[start_x - 1][y + 1] != self.map[x][y]) start_x -= 1;
+                while (self.map[end_x + 1][y] == self.map[x][y] and self.map[end_x + 1][y + 1] != self.map[x][y]) end_x += 1;
+            },
+        }
+
+        try self.areas.items[self.areas.items.len - 1].sides.append(Side{
+            .start = [2]usize{ start_x, start_y },
+            .end = [2]usize{ end_x, end_y },
+            .direction = direction,
+        });
+    }
+
+    fn calculPrice(self: Map) usize {
+        var total: usize = 0;
+        for (self.areas.items) |area| {
+            total += area.sides.items.len * area.area;
+        }
+        return total;
+    }
+
+    fn printPos(self: Map, x: usize, y: usize) void {
+        for (0..MAP_SIZE + 2) |x2| {
+            print("\n", .{});
+            for (0..MAP_SIZE + 2) |y2| {
+                if (x == x2 and y == y2) {
+                    print("{c}", .{self.map[x][y]});
+                } else {
+                    print(".", .{});
+                }
+            }
+        }
+        print("\n", .{});
+    }
+
+    fn printAreasOneByOne(self: Map) !void {
+        for (self.areas.items) |area| {
+            clearScreen();
+            print("Region {c} with Side: {d}; and Area: {d}\n", .{ area.char, area.sides.items.len, area.area });
+            for (area.sides.items) |side| {
+                print("Side {any}\n", .{side});
+            }
+            for (0..MAP_SIZE + 2) |x| {
+                print("\n", .{});
+                for (0..MAP_SIZE + 2) |y| {
+                    if (area.positions.contains([2]usize{ x, y })) {
+                        print("{c}", .{self.map[x][y]});
+                    } else {
+                        print(".", .{});
+                    }
+                }
+            }
+            print("\n", .{});
+            try waitForInput();
+        }
+    }
+
+    fn printAreasSideOneByOne(self: Map) !void {
+        for (self.areas.items) |area| {
+            for ([4]Direction{ .UP, .DOWN, .LEFT, .RIGHT }) |direction| {
+                clearScreen();
+                print("Region {c} with Side: {d}; and Area: {d}, Direction {any}\n", .{ area.char, area.sides.items.len, area.area, direction });
+                for (0..MAP_SIZE + 2) |x| {
+                    print("\n", .{});
+                    for (0..MAP_SIZE + 2) |y| {
+                        if (area.isInSide(x, y, direction)) {
+                            print("{c}", .{self.map[x][y]});
+                        } else {
+                            print(".", .{});
+                        }
+                    }
+                }
+                print("\n", .{});
+                try waitForInput();
+            }
+        }
+    }
+};
+
+pub fn main() !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+
+    var map = try Map.init(allocator);
+    map.set('.');
+    map.setInput();
+    try map.populateAreas();
+    //try map.printAreasSideOneByOne();
+    try std.testing.expectEqual(821372, map.calculPrice());
+}
+
+fn clearScreen() void {
+    print("\x1B[2J\x1B[H", .{});
+}
+
+fn waitForInput() !void {
+    var buf: [5]u8 = undefined;
+    const stdin = std.io.getStdIn().reader();
+    _ = try stdin.readUntilDelimiter(&buf, '\n');
+}