diff --git a/res/2025/day03/test_input.txt b/res/2025/day03/test_input.txt
new file mode 100644
index 0000000..7255fca
--- /dev/null
+++ b/res/2025/day03/test_input.txt
@@ -0,0 +1,4 @@
+987654321111111
+811111111111119
+234234234234278
+818181911112111
diff --git a/src/2025/Day03.cpp b/src/2025/Day03.cpp
index bf2cc73..361a817 100644
--- a/src/2025/Day03.cpp
+++ b/src/2025/Day03.cpp
@@ -2,35 +2,64 @@
 
 namespace y2025::day03
 {
-  using InputType = std::vector<int>;
-  REGISTER_DAY(2025, Day03, InputType, int);
+  using InputType = std::vector<std::string>;
+  REGISTER_DAY(2025, Day03, InputType, int64_t);
 
-  REGISTER_TEST_EXAMPLE(2025, Day03, ExampleInput, 1, 0);
-  REGISTER_TEST(2025, Day03, Input, 1, 0);
-  REGISTER_TEST_EXAMPLE(2025, Day03, ExampleInput, 2, 0);
-  REGISTER_TEST(2025, Day03, Input, 2, 0);
+  REGISTER_TEST_EXAMPLE(2025, Day03, ExampleInput, 1, 357);
+  REGISTER_TEST(2025, Day03, Input, 1, 17430);
+  REGISTER_TEST_EXAMPLE(2025, Day03, ExampleInput, 2, 3121910778619);
+  REGISTER_TEST(2025, Day03, Input, 2, 171975854269367);
 
   READ_INPUT(input)
   {
-    std::vector<int> vec;
+    std::vector<std::string> vec;
     std::string str;
     while (std::getline(input, str))
     {
-      std::stringstream ss{str};
-      int n;
-      ss >> n;
-      vec.emplace_back(n);
+      vec.emplace_back(str);
     }
     return vec;
   }
 
+  template <size_t N>
+  int64_t Joltage(const std::vector<std::string>& input)
+  {
+    int64_t sum = 0;
+
+    for (const auto& line : input)
+    {
+      std::array<int, N> max{};
+      std::array<int, N + 1> index{};
+      for (int i = 0; i < max.size(); i++)
+      {
+        for (int j = index[i]; j <= line.size() - (max.size() - i); j++)
+        {
+          int num = line[j] - '0';
+          if (num > max[i])
+          {
+            max[i] = num;
+            index[i + 1] = j + 1;
+          }
+        }
+      }
+
+      int64_t val = 0;
+      for (int i = 0; i < max.size(); i++)
+      {
+        val = val * 10 + max[i];
+      }
+      sum += val;
+    }
+    return sum;
+  }
+
   OUTPUT1(input)
   {
-    return 0;
+    return Joltage<2>(input);
   }
 
   OUTPUT2(input)
   {
-    return 0;
+    return Joltage<12>(input);
   }
 }
diff --git a/src/common/lib/Helper.h b/src/common/lib/Helper.h
index 69a87be..2285397 100644
--- a/src/common/lib/Helper.h
+++ b/src/common/lib/Helper.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <algorithm>
+#include <array>
 #include <functional>
 #include <iostream>
 #include <limits>
@@ -685,6 +686,12 @@ static std::ostream& operator<<(std::ostream& stream, const std::set<T>& contain
   return Helper::Print(stream, container);
 }
 
+template <typename T, size_t N>
+static std::ostream& operator<<(std::ostream& stream, const std::array<T, N>& container)
+{
+  return Helper::Print(stream, container);
+}
+
 template <typename T, typename S>
 static std::ostream& operator<<(std::ostream& stream, const std::map<T, S>& container)
 {