Add solution for 2025 Day 3

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)
 {