diff --git a/cpp/2305/LC230506CN.cpp b/cpp/2305/LC230506CN.cpp
new file mode 100644
index 0000000..6eaa98f
--- /dev/null
+++ b/cpp/2305/LC230506CN.cpp
@@ -0,0 +1,52 @@
+#include <algorithm>
+#include <string>
+
+/**
+ * 1419. Minimum Number of Frogs Croaking
+ *
+ * You are given the string croakOfFrogs, which represents a combination of the string "croak" from different frogs, that is, multiple frogs can croak at the same time, so multiple "croak" are mixed.
+ * Return the minimum number of different frogs to finish all the croaks in the given string.
+ * A valid "croak" means a frog is printing five letters 'c', 'r', 'o', 'a', and 'k' sequentially. The frogs have to print all five letters to finish a croak. If the given string is not a combination of a valid "croak" return -1.
+ */
+
+class LC230506CN {
+public:
+	static int minNumberOfFrogs(const std::string&) noexcept;
+};
+
+int LC230506CN::minNumberOfFrogs(const std::string& croakOfFrogs) noexcept {
+	if (croakOfFrogs.length() % 5)
+		return -1;
+	int cnt[4]{}, total = 0, ret = 0;
+	for (char c: croakOfFrogs) {
+		switch (c) {
+			case 'c':
+				++total, ++cnt[0];
+				break;
+			case 'r':
+				if (!cnt[0])
+					return -1;
+				--cnt[0], ++cnt[1];
+				break;
+			case 'o':
+				if (!cnt[1])
+					return -1;
+				--cnt[1], ++cnt[2];
+				break;
+			case 'a':
+				if (!cnt[2])
+					return -1;
+				--cnt[2], ++cnt[3];
+				break;
+			case 'k':
+				if (!cnt[3])
+					return -1;
+				--cnt[3], --total;
+				break;
+			default:
+				return -1;
+		}
+		ret = std::max(ret, total);
+	}
+	return total ? -1 : ret;
+}
diff --git a/cpp/2305/defs.h b/cpp/2305/defs.h
index f84b37b..841d4ab 100644
--- a/cpp/2305/defs.h
+++ b/cpp/2305/defs.h
@@ -65,4 +65,9 @@ public:
 	static int numSubseq(std::vector<int>&, int) noexcept;
 };
 
+class LC230506CN {
+public:
+	static int minNumberOfFrogs(const std::string&) noexcept;
+};
+
 #endif //LEETCODE_CPP_DEFS_H
diff --git a/cpp/2305/main.cpp b/cpp/2305/main.cpp
index 7717319..4ec3ca9 100644
--- a/cpp/2305/main.cpp
+++ b/cpp/2305/main.cpp
@@ -12,7 +12,6 @@ std::ostream& operator<<(std::ostream& os, const std::vector<T>& x) noexcept {
 }
 
 int main() {
-	std::vector<int> arr {2,3,3,4,6,7};
-	std::cout << LC230506::numSubseq(arr,12);
+	std::cout << LC230506CN::minNumberOfFrogs("crcoakroak");
 	return 0;
 }