chore: import upstream snapshot with attribution

tests/test_data/data_sources/ctf/rev/rock/solution.cpp

@@ -0,0 +1,24 @@
+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main(){
+	string solution = "FLAG23456912365453475897834567";
+	for(int i =0; i <= solution.length();i++){
+        cout << i << " " << solution[i] << " " << ((int) solution[i]);
+		solution[i] = char(((solution[i]-(265%999))^0x10));
+        cout << " " << solution[i] << " " << ((int) solution[i]) << endl;
+	} 	
+
+	for(int j =0; j <= solution.length();j++){
+        cout << j << " " << solution[j] << " " << ((int) solution[j]);
+		solution[j] = char((solution[j] - 20)^0x50);
+        cout << " " << solution[j] << " " << ((int) solution[j]) << endl;
+	}
+
+	cout << "FLAG:" << solution << endl;
+
+
+
+}