diff --git a/cpp/2305/LC230513.cpp b/cpp/2305/LC230513.cpp
new file mode 100644
index 0000000..18a30aa
--- /dev/null
+++ b/cpp/2305/LC230513.cpp
@@ -0,0 +1,38 @@
+#include <algorithm>
+
+/**
+ * 2466. Count Ways To Build Good Strings
+ *
+ * Given the integers zero, one, low, and high, we can construct a string by starting with an empty string, and then at each step perform either of the following:
+ *
+ * Append the character '0' zero times.
+ * Append the character '1' one times.
+ * This can be performed any number of times.
+ *
+ * A good string is a string constructed by the above process having a length between low and high (inclusive).
+ *
+ * Return the number of different good strings that can be constructed satisfying these properties. Since the answer can be large, return it modulo 109 + 7.
+ */
+
+class LC230513 {
+public:
+	static int countGoodStrings(int, int, int, int) noexcept;
+};
+
+int LC230513::countGoodStrings(int low, int high, int zero, int one) noexcept {
+	static constexpr int mod = 1'000'000'007;
+	int* dp = new int[high + 5]{1};
+	for (int i = zero; i < one; ++i)
+		dp[i] = dp[i - zero];
+	for (int i = one; i < zero; ++i)
+		dp[i] = dp[i - one];
+	for (int i = std::max(zero, one); i <= high; ++i)
+		dp[i] = (dp[i - zero] + dp[i - one]) % mod;
+	int ret = 0;
+	for (int i = low; i <= high; ++i)
+		ret = (ret + dp[i]) % mod;
+	delete[] dp;
+	return ret;
+}
+
+using Solution = LC230513;
diff --git a/cpp/2305/defs.h b/cpp/2305/defs.h
index 94a3a6c..8ca2142 100644
--- a/cpp/2305/defs.h
+++ b/cpp/2305/defs.h
@@ -129,4 +129,9 @@ public:
 	static long long mostPoints(const std::vector<std::vector<int>>&) noexcept;
 };
 
+class LC230513 {
+public:
+	static int countGoodStrings(int, int, int, int) noexcept;
+};
+
 #endif //LEETCODE_CPP_DEFS_H
diff --git a/cpp/2305/main.cpp b/cpp/2305/main.cpp
index ee2c2f8..08b49b3 100644
--- a/cpp/2305/main.cpp
+++ b/cpp/2305/main.cpp
@@ -14,6 +14,6 @@ std::ostream& operator<<(std::ostream& os, const std::vector<T>& x) noexcept {
 }
 
 int main() {
-	std::cout << LC230512::mostPoints({{3,2}, {4,3}, {4,4}, {2,5}});
+	std::cout << LC230513::countGoodStrings(2,3,1,2);
 	return 0;
 }