diff --git "a/khj20006/202511/18 PGM LV2 \355\214\214\354\235\274\353\252\205 \354\240\225\353\240\254.md" "b/khj20006/202511/18 PGM LV2 \355\214\214\354\235\274\353\252\205 \354\240\225\353\240\254.md"
new file mode 100644
index 00000000..e636f2a9
--- /dev/null
+++ "b/khj20006/202511/18 PGM LV2 \355\214\214\354\235\274\353\252\205 \354\240\225\353\240\254.md"	
@@ -0,0 +1,51 @@
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+
+class CustomString {
+public:
+	string str, head;
+	int number, order;
+	CustomString(string a, int ord) {
+		this->str = a;
+		this->order = ord;
+		int idx = 0;
+		this->head = "";
+		string num = "";
+		while (idx < a.size()) {
+			if ('0' <= a[idx] && a[idx] <= '9') {
+				num += a[idx];
+			}
+			else {
+				if (!num.empty()) break;
+				if ('A' <= a[idx] && a[idx] <= 'Z') head += (char)(a[idx] + 32);
+				else head += a[idx];
+			}
+			idx++;
+		}
+		this->number = stoi(num);
+	}
+};
+
+
+vector<string> solution(vector<string> files) {
+	vector<CustomString*> customFiles;
+	int ord = 0;
+	for (string file : files) {
+		customFiles.push_back(new CustomString(file, ++ord));
+	}
+
+	sort(customFiles.begin(), customFiles.end(), [](CustomString* a, CustomString* b) -> bool {
+		if (a->head != b->head) return a->head < b->head;
+		if (a->number != b->number) return a->number < b->number;
+		return a->order < b->order;
+	});
+
+	vector<string> answer;
+	for (CustomString* cs : customFiles) {
+		answer.push_back(cs->str);
+	}
+	
+	return answer;
+}
+```