From 7fb1f4f77869c2dd41756f7cfb0827763eee4c3d Mon Sep 17 00:00:00 2001
From: Pratchaya Khansomboon <pratchak@axis.com>
Date: Thu, 11 Dec 2025 13:57:49 +0100
Subject: [PATCH] 2025 day 2 p1

---
 2025/day02.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 48 insertions(+), 4 deletions(-)

diff --git a/2025/day02.cpp b/2025/day02.cpp
index 5fcf0ab..01012d2 100644
--- a/2025/day02.cpp
+++ b/2025/day02.cpp
@@ -22,17 +22,61 @@ using namespace aoc::types;
 )";
 
 static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
-    std::string str{raw_str};
-    // auto str = aoc::read_text("./input.txt").value_or("");
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
     str = aoc::trim(str);
 
     auto ids_str = str | std::views::split(","sv) | std::views::transform([](auto const& str) {
-        return aoc::trim({std::begin(str), std::end(str)});
+        std::vector<u64> range{};
+        range.resize(2);
+
+        // std::ranges::transform(
+        //     aoc::trim(std::string{std::begin(str), std::end(str)}) | std::views::split("-"sv),
+        //     std::begin(range),
+        //     [](auto const& value) {
+        //         return aoc::trim(std::string{std::begin(value), std::end(value)});
+        //  });
+
+        std::ranges::transform(
+            aoc::trim(std::string{std::begin(str), std::end(str)}) | std::views::split("-"sv),
+            std::begin(range),
+            [](auto const& value) {
+                return u64(std::stoul(aoc::trim(std::string{std::begin(value), std::end(value)})));
+         });
+
+        return range;
     }) | std::ranges::to<std::vector>();
 
+    auto is_valid_id = [](u64 id) {
+        auto const str = fmt::format("{}", id);
+        if (str.size() % 2 != 0) return true;
+        bool is_invalid = true;
+        for (usize i = 0; i < str.size() / 2; ++i) {
+            if (str[i] != str[str.size() / 2 + i]) {
+                is_invalid = false;
+                continue;
+            }
+        }
+        return !is_invalid;
+    };
+
+    u64 sum = 0;
+
     for (auto const& id : ids_str) {
-        std::print("{}\n", id);
+        u64 const start = id[0];
+        u64 const end = id[1];
+
+        fmt::print("{} -> {}: ", id[0], id[1]);
+        for (u64 i = start; i <= end; ++i) {
+            if (!is_valid_id(i)) {
+                fmt::print("{}, ", i);
+                sum += i;
+            }
+        }
+        fmt::print("\n");
     }
+
+    fmt::print("res: {}\n", sum);
 }
 
 auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {