diff --git a/dat/24/ex/10a.txt b/dat/24/ex/10a.txt
new file mode 100644
index 0000000..a305b9d
--- /dev/null
+++ b/dat/24/ex/10a.txt
@@ -0,0 +1,4 @@
+0123
+1234
+8765
+9876
diff --git a/dat/24/ex/10b.txt b/dat/24/ex/10b.txt
new file mode 100644
index 0000000..db56de0
--- /dev/null
+++ b/dat/24/ex/10b.txt
@@ -0,0 +1,7 @@
+...0...
+...1...
+...2...
+6543456
+7.....7
+8.....8
+9.....9
diff --git a/dat/24/ex/10c.txt b/dat/24/ex/10c.txt
new file mode 100644
index 0000000..17655af
--- /dev/null
+++ b/dat/24/ex/10c.txt
@@ -0,0 +1,7 @@
+..90..9
+...1.98
+...2..7
+6543456
+765.987
+876....
+987....
diff --git a/dat/24/ex/10d.txt b/dat/24/ex/10d.txt
new file mode 100644
index 0000000..185787f
--- /dev/null
+++ b/dat/24/ex/10d.txt
@@ -0,0 +1,7 @@
+10..9..
+2...8..
+3...7..
+4567654
+...8..3
+...9..2
+.....01
diff --git a/dat/24/ex/10e.txt b/dat/24/ex/10e.txt
new file mode 100644
index 0000000..cada9b3
--- /dev/null
+++ b/dat/24/ex/10e.txt
@@ -0,0 +1,8 @@
+89010123
+78121874
+87430965
+96549874
+45678903
+32019012
+01329801
+10456732
diff --git a/dat/24/re/10.txt b/dat/24/re/10.txt
new file mode 100644
index 0000000..ebf45d3
--- /dev/null
+++ b/dat/24/re/10.txt
@@ -0,0 +1,40 @@
+6541001098012789610347890107654656710323
+7832102127643898701256521218323465891410
+8996543034556789650987434309012534892565
+3887689678965876501874345892105621763676
+4305678563456903416765676756898760654980
+5214107852107812321254382347872108901221
+6543236943056921010341291078963457654338
+7896545987045430010980012569454968983549
+3217830656189899121676101430356879892678
+2106921043210778234585232321267898761432
+3478854430345665056798743410456901050501
+4569763521012552143895654501345012347670
+3654012678903443212104309690432167898981
+2783656987654874908765218781201254012567
+1092347897893965889034765670387063013498
+1001298756102456776121874989496122110901
+2310891043201307655430923876565434325892
+3456780103011218967649810189410145456743
+2561078212320989858236702107320236787654
+1232569343423874749145893678741199899873
+0343454358514565632098704569632087684562
+0456789969609034501347612189323456893001
+1499876878798123101256543079012548762110
+2387905462687678871212344568187659450223
+3456012301056549960305650127691098321054
+3456732102345832154454781034540107650169
+2369847898738981023763692321121256743278
+1078456654567670119832103400012349894361
+0012387763456543208041076510123412765010
+7650196892565454589107889623296503854321
+8943256781074303673236908774387654983432
+8912965890985210984365219985345015676541
+7607834187866789875434308776236723498650
+6506543045679012766923105698109894567743
+5410432134988703457810014567056210754892
+0322345028767845893456723459847349889701
+1201276719454936712679801210738256776545
+2450989805103221604589752345629145480230
+2347823456012120113298943238710076591121
+1056910147893012320107654109656789432012
diff --git a/sol/24/CMakeLists.txt b/sol/24/CMakeLists.txt
index 1452b3d..339a40a 100644
--- a/sol/24/CMakeLists.txt
+++ b/sol/24/CMakeLists.txt
@@ -4,13 +4,15 @@ set(HEADERS
 set(SOURCES
     "aoc.cpp"
     "day01.cpp"
-    "day02.cpp"
+    # "day02.cpp"
     "day03.cpp"
-    "day04.cpp"
+    # "day04.cpp"
     "day05.cpp"
     "day06.cpp"
     "day07.cpp"
     "day08.cpp"
+    "day09.cpp"
+    "day10.cpp"
 )
 add_library(aoc24 STATIC ${HEADERS} ${SOURCES})
 target_include_directories(aoc24
diff --git a/sol/24/aoc.cpp b/sol/24/aoc.cpp
index ad48766..99e9e03 100644
--- a/sol/24/aoc.cpp
+++ b/sol/24/aoc.cpp
@@ -19,13 +19,15 @@ auto entry([[maybe_unused]]std::span<char const*> const& args) -> std::expected<
 
     switch (day) {
     case 1: return day01(args);
-    case 2: return day02(args);
+    // case 2: return day02(args);
     case 3: return day03(args);
-    case 4: return day04(args);
+    // case 4: return day04(args);
     case 5: return day05(args);
     case 6: return day06(args);
     case 7: return day07(args);
     case 8: return day08(args);
+    // case 9: return day09(args);
+    case 10: return day10(args);
     default:
         return aoc::make_error(fmt::format("day {}", day), std::errc::not_supported);
     }
diff --git a/sol/24/day07.cpp b/sol/24/day07.cpp
index 65ad9bc..9435b2c 100644
--- a/sol/24/day07.cpp
+++ b/sol/24/day07.cpp
@@ -6,7 +6,7 @@ namespace rbr {
 }
 
 auto aoc24::day07([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
-    auto res = aoc::read_text("./dat/24/re/07.txt");
+    auto res = aoc::read_text("./dat/24/ex/07.txt");
     if (!res) return std::unexpected(res.error());
     auto const txt = *res;
 
diff --git a/sol/24/day08.cpp b/sol/24/day08.cpp
index 9d15ced..c6d84e4 100644
--- a/sol/24/day08.cpp
+++ b/sol/24/day08.cpp
@@ -3,5 +3,5 @@
 #include "fmt/format.h"
 
 auto aoc24::day08([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
-    return aoc::make_error("day 8", std::errc::not_supported);
+    return aoc::make_error("", std::errc::not_supported);
 }
diff --git a/sol/24/day09.cpp b/sol/24/day09.cpp
new file mode 100644
index 0000000..e1e7bf9
--- /dev/null
+++ b/sol/24/day09.cpp
@@ -0,0 +1,7 @@
+#include "aoc.hpp"
+#include "aoc/utils.hpp"
+#include "fmt/format.h"
+
+auto aoc24::day09([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
+    return aoc::make_error("", std::errc::not_supported);
+}
diff --git a/sol/24/day10.cpp b/sol/24/day10.cpp
new file mode 100644
index 0000000..c5d1708
--- /dev/null
+++ b/sol/24/day10.cpp
@@ -0,0 +1,84 @@
+#include <utility>
+#include <vector>
+#include <algorithm>
+#include <numeric>
+
+#include "aoc.hpp"
+#include "aoc/utils.hpp"
+#include "fmt/format.h"
+
+using namespace aoc::types;
+using namespace std::string_view_literals;
+
+namespace lpf {
+using edge_t = std::pair<class node, class node>;
+using edges_t = std::vector<edge_t>;
+
+class node {
+public:
+    node(i32 id, i32 value, edges_t const& edges)
+        : m_id(id), m_value(value), m_edges(edges) {}
+
+    auto operator==(node const& other) const -> bool {
+        return m_id == other.m_id && m_value == other.m_value;
+    }
+
+    auto id() const -> i32 { return m_id; }
+    auto value() const -> i32 { return m_value; }
+    auto edges() const -> edges_t const& { return m_edges; }
+
+private:
+    i32 m_id;
+    i32 m_value;
+    edges_t m_edges;
+};
+
+class trail {
+public:
+    trail(std::string const& str) {
+        auto lines = str | std::views::split("\n"sv)
+                         | std::views::transform(
+                                 [](auto const& c_str) {
+                                    return std::string_view(
+                                               std::begin(c_str),
+                                               std::end(c_str)
+                                           );
+                                 })
+                         | std::views::filter([](auto const& strv) { return !strv.empty(); })
+                         | std::ranges::to<std::vector>();
+
+        m_rows = lines.size();
+        m_cols = std::begin(lines)->size();
+
+        std::ranges::for_each(lines, [&](auto const& str) {
+            std::ranges::for_each(str, [&](auto const& ch) {
+                if (std::isdigit(ch)) m_data.emplace_back(ch - '0');
+                else m_data.emplace_back(0xFF);
+            });
+        });
+    }
+
+    auto at(usize row, usize col) const -> u8 {
+        if (row >= m_rows || col >= m_cols) return 0;
+        return m_data[row * m_cols + col];
+    }
+    auto rows() const -> usize { return m_rows; }
+    auto cols() const -> usize { return m_cols; }
+    auto data() const -> std::vector<u8> const& { return m_data; }
+
+private:
+    usize m_rows;
+    usize m_cols;
+    std::vector<u8> m_data;
+};
+}
+
+auto aoc24::day10([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
+    auto res = aoc::read_text("./dat/24/ex/10a.txt");
+    if (!res) return std::unexpected(res.error());
+    auto const txt = *res;
+
+    lpf::trail trail{txt};
+
+    return {};
+}