diff --git a/README.md b/README.md
index 5be142d..ce329c8 100644
--- a/README.md
+++ b/README.md
@@ -11,13 +11,14 @@ Done with 1000 epoch on a AMD Ryzen 7 7800X3D with a Samsung SSD 980 PRO 2TB (up
 Can be run with `zig run -O ReleaseFast benchmark.zig`
 
 | Day | Part | Mean (μs)         | Min (μs) | Max (μs) |
-|-----|------|-------------------|----------|----------|
-| 1   | 1    |      +29 ± 3.00   |      +28 |      +78 |
-| 1   | 2    |      +24 ± 2.65   |      +24 |      +56 |
-| 2   | 1    |      +43 ± 8.37   |      +37 |     +241 |
-| 2   | 2    |     +328 ± 33.84  |     +298 |     +728 |
-| 3   | 1    |      +24 ± 6.24   |      +20 |     +170 |
-| 3   | 2    |      +23 ± 1.73   |      +20 |      +58 |
-| 4   | 2    |     +229 ± 26.15  |     +214 |     +417 |
-| 4   | 2    |     +232 ± 26.13  |     +213 |     +337 |
-| Total|      |     +932 ± 108.11 |     +854 |    +2085 |
+| 1   | 1    |      +29 ± 3.74   |      +28 |      +99 |
+| 1   | 2    |      +26 ± 6.78   |      +24 |     +136 |
+| 2   | 1    |      +39 ± 6.00   |      +37 |     +179 |
+| 2   | 2    |     +314 ± 17.64  |     +291 |     +446 |
+| 3   | 1    |      +21 ± 5.20   |      +20 |     +163 |
+| 3   | 2    |      +19 ± 2.24   |      +18 |      +43 |
+| 4   | 1    |     +225 ± 16.31  |     +217 |     +347 |
+| 4   | 2    |     +220 ± 7.87   |     +216 |     +311 |
+| 5   | 1    |     +166 ± 24.29  |     +148 |     +429 |
+| 5   | 2    |     +228 ± 69.64  |     +173 |     +661 |
+| Total|      |    +1287 ± 159.71 |    +1172 |    +2814 |
diff --git a/benchmark.zig b/benchmark.zig
index 5fd61a2..f7d1ea0 100644
--- a/benchmark.zig
+++ b/benchmark.zig
@@ -9,6 +9,8 @@ const d31 = @import("day3/part1.zig");
 const d32 = @import("day3/part2.zig");
 const d41 = @import("day4/part1.zig");
 const d42 = @import("day4/part2.zig");
+const d51 = @import("day5/part1.zig");
+const d52 = @import("day5/part2.zig");
 
 const NUMBER_OF_RUN = 1000;
 
@@ -30,8 +32,11 @@ pub fn main() !void {
     try benchmark(d31.main, 3, 1);
     try benchmark(d32.main, 3, 2);
     separator();
+    try benchmark(d42.main, 4, 1);
     try benchmark(d42.main, 4, 2);
-    try benchmark(d42.main, 4, 2);
+    separator();
+    try benchmark(d51.main, 5, 1);
+    try benchmark(d52.main, 5, 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/day5/input b/day5/input
new file mode 100644
index 0000000..b802783
--- /dev/null
+++ b/day5/input
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diff --git a/day5/part1.zig b/day5/part1.zig
new file mode 100644
index 0000000..07e80c1
--- /dev/null
+++ b/day5/part1.zig
@@ -0,0 +1,107 @@
+const std = @import("std");
+const print = std.debug.print;
+
+const Rule = struct {
+    left: usize,
+    right: usize,
+
+    fn ok(self: Rule, sub_page: Rule) bool {
+        return !(sub_page.left == self.right and sub_page.right == self.left);
+    }
+};
+
+const PageIterator = struct {
+    indexL: usize = 0,
+    indexR: usize = 0,
+    buff: []usize,
+
+    fn next(self: *PageIterator) ?Rule {
+        self.indexR += 1;
+
+        if (self.indexR == self.buff.len) {
+            self.indexL += 1;
+            self.indexR = self.indexL + 1;
+        }
+
+        if (self.indexL == (self.buff.len - 1)) return null;
+
+        return Rule{
+            .left = self.buff[self.indexL],
+            .right = self.buff[self.indexR],
+        };
+    }
+
+    fn reset(self: *PageIterator) void {
+        self.indexL = 0;
+        self.indexR = 1;
+    }
+
+    fn swap(self: *PageIterator) void {
+        const buffR: usize = self.buff[self.indexR];
+        self.buff[self.indexR] = self.buff[self.indexL];
+        self.buff[self.indexL] = buffR;
+    }
+};
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer {
+        const deinit_status = gpa.deinit();
+        if (deinit_status == .leak) @panic("TEST FAIL");
+    }
+
+    // ========= Load file ===========
+    const file = try std.fs.cwd().openFile("day5/input", .{});
+    defer file.close();
+
+    const file_size = (try file.stat()).size;
+    const buffer = try allocator.alloc(u8, file_size);
+    defer allocator.free(buffer);
+
+    _ = try file.readAll(buffer);
+
+    // ========= Parse Rules ===========
+    var bad_rules = std.AutoHashMap(Rule, void).init(allocator);
+    defer bad_rules.deinit();
+
+    var iter = std.mem.split(u8, buffer, "\n");
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) break;
+
+        _ = try bad_rules.getOrPut(Rule{
+            .right = try std.fmt.parseInt(usize, line[0..2], 10),
+            .left = try std.fmt.parseInt(usize, line[3..5], 10),
+        });
+    }
+
+    // ========= Evaluate ===========
+    var page = std.ArrayList(usize).init(allocator);
+    defer page.deinit();
+
+    var total: usize = 0;
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) break;
+        defer page.clearRetainingCapacity();
+
+        var sub_iter = std.mem.split(u8, line, ",");
+        while (sub_iter.next()) |value_str| {
+            try page.append(try std.fmt.parseInt(usize, value_str, 10));
+        }
+
+        total += try evaluate(bad_rules, page.items);
+    }
+
+    try std.testing.expectEqual(6949, total);
+}
+
+fn evaluate(bad_rules: std.AutoHashMap(Rule, void), page: []usize) !usize {
+    var iter = PageIterator{ .indexL = 0, .indexR = 0, .buff = page };
+
+    defer iter.reset();
+    while (iter.next()) |sub_page| {
+        if (bad_rules.contains(sub_page)) return 0;
+    }
+    const middle = try std.math.divFloor(usize, page.len, 2);
+    return page[middle];
+}
diff --git a/day5/part2.zig b/day5/part2.zig
new file mode 100644
index 0000000..7591a9c
--- /dev/null
+++ b/day5/part2.zig
@@ -0,0 +1,129 @@
+const std = @import("std");
+const print = std.debug.print;
+
+const Rule = struct {
+    left: usize,
+    right: usize,
+
+    fn ok(self: Rule, sub_page: Rule) bool {
+        if (sub_page.left == self.right and sub_page.right == self.left) return false;
+        return true;
+    }
+};
+
+const PageIterator = struct {
+    indexL: usize = 0,
+    indexR: usize = 0,
+    buff: []usize,
+
+    fn next(self: *PageIterator) ?Rule {
+        self.indexR += 1;
+
+        if (self.indexR == self.buff.len) {
+            self.indexL += 1;
+            self.indexR = self.indexL + 1;
+        }
+
+        if (self.indexL == (self.buff.len - 1)) return null;
+
+        return Rule{
+            .left = self.buff[self.indexL],
+            .right = self.buff[self.indexR],
+        };
+    }
+
+    fn reset(self: *PageIterator) void {
+        self.indexL = 0;
+        self.indexR = 1;
+    }
+
+    fn swap(self: *PageIterator) void {
+        const buffR: usize = self.buff[self.indexR];
+        self.buff[self.indexR] = self.buff[self.indexL];
+        self.buff[self.indexL] = buffR;
+    }
+};
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer {
+        const deinit_status = gpa.deinit();
+        if (deinit_status == .leak) @panic("TEST FAIL");
+    }
+
+    // ========= Load file ===========
+    const file = try std.fs.cwd().openFile("day5/input", .{});
+    defer file.close();
+
+    const file_size = (try file.stat()).size;
+    const buffer = try allocator.alloc(u8, file_size);
+    defer allocator.free(buffer);
+
+    _ = try file.readAll(buffer);
+
+    // ========= Parse Rules ===========
+    var bad_rules = std.AutoHashMap(Rule, void).init(allocator);
+    defer bad_rules.deinit();
+
+    var iter = std.mem.split(u8, buffer, "\n");
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) break;
+
+        _ = try bad_rules.getOrPut(Rule{
+            .right = try std.fmt.parseInt(usize, line[0..2], 10),
+            .left = try std.fmt.parseInt(usize, line[3..5], 10),
+        });
+    }
+
+    // ========= Evaluate ===========
+    var page = std.ArrayList(usize).init(allocator);
+    defer page.deinit();
+
+    var total: usize = 0;
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) break;
+        defer page.clearRetainingCapacity();
+
+        var sub_iter = std.mem.split(u8, line, ",");
+        while (sub_iter.next()) |value_str| {
+            try page.append(try std.fmt.parseInt(usize, value_str, 10));
+        }
+
+        total += try evaluate(bad_rules, page.items);
+    }
+
+    try std.testing.expectEqual(4145, total);
+}
+
+fn pageOk(bad_rules: std.AutoHashMap(Rule, void), page: []usize) bool {
+    var iter = PageIterator{ .indexL = 0, .indexR = 0, .buff = page };
+
+    defer iter.reset();
+    while (iter.next()) |sub_page| {
+        if (bad_rules.contains(sub_page)) return false;
+    }
+    return true;
+}
+
+fn evaluate(bad_rules: std.AutoHashMap(Rule, void), page: []usize) !usize {
+    var notOk = true;
+    var iter = PageIterator{ .indexL = 0, .indexR = 0, .buff = page };
+
+    if (pageOk(bad_rules, page)) return 0;
+
+    while (notOk) {
+        notOk = false;
+        blk: {
+            while (iter.next()) |sub_page| {
+                if (bad_rules.contains(sub_page)) {
+                    notOk = true;
+                    iter.swap();
+                    break :blk;
+                }
+            }
+        }
+    }
+    const middle = try std.math.divFloor(usize, page.len, 2);
+    return page[middle];
+}