diff --git a/lectures/22_priority_queues/README.md b/lectures/24_priority_queues/README.md
similarity index 100%
rename from lectures/22_priority_queues/README.md
rename to lectures/24_priority_queues/README.md
diff --git a/lectures/24_priority_queues/a.out b/lectures/24_priority_queues/a.out
new file mode 100755
index 0000000..bbe45fa
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diff --git a/lectures/22_priority_queues/max_heap.cpp b/lectures/24_priority_queues/max_heap.cpp
similarity index 100%
rename from lectures/22_priority_queues/max_heap.cpp
rename to lectures/24_priority_queues/max_heap.cpp
diff --git a/lectures/22_priority_queues/min_heap.cpp b/lectures/24_priority_queues/min_heap.cpp
similarity index 100%
rename from lectures/22_priority_queues/min_heap.cpp
rename to lectures/24_priority_queues/min_heap.cpp
diff --git a/lectures/24_priority_queues/test.cpp b/lectures/24_priority_queues/test.cpp
new file mode 100644
index 0000000..aacb68a
--- /dev/null
+++ b/lectures/24_priority_queues/test.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+
+int main(){
+
+	int a[] = { 0, 1, 2, 3, 4, 5 };
+	for (int n : a)
+		std::cout << n << ' ';
+
+}
diff --git a/lectures/23_priority_queues_II/README.md b/lectures/25_priority_queues_II/README.md
similarity index 100%
rename from lectures/23_priority_queues_II/README.md
rename to lectures/25_priority_queues_II/README.md
diff --git a/lectures/21_hash_tables_II/README.md b/lectures/hash_tables_II/README.md
similarity index 100%
rename from lectures/21_hash_tables_II/README.md
rename to lectures/hash_tables_II/README.md
diff --git a/lectures/hash_tables_II/a.out b/lectures/hash_tables_II/a.out
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diff --git a/lectures/21_hash_tables_II/functor.cpp b/lectures/hash_tables_II/functor.cpp
similarity index 100%
rename from lectures/21_hash_tables_II/functor.cpp
rename to lectures/hash_tables_II/functor.cpp