Removed Practise files and Added "Static Arrays" lesson of NEETCODE

Author: Saidev

01-static_arrays.py

@@ -0,0 +1,65 @@
+arr = [1, 2, 3, 4, 5]
+
+print("READ")
+# READING FROM AN ARRAY --> O(1)
+
+index = 3
+print(arr[index])
+
+print("------------------------------------------------------------------------------")
+
+print("TRAVERSE")
+# TRAVERSING THROUGH AN ARRAY --> O(n)
+
+print("Using For Loop")
+for i in range(len(arr)):
+    print(arr[i], end="->")
+print()
+
+print("Using While Loop")
+index = 0
+while index < len(arr):
+    print(arr[index], end="->")
+    index += 1
+print()
+
+print("------------------------------------------------------------------------------")
+
+print("DELETE")
+# DELETING FROM AN ARRAY --> O(n)
+
+print("From the end of Array --> O(1)")
+print(f"Before Delete: {arr}")
+del arr[len(arr)-1]
+print(f"After Delete: {arr}")
+
+arr = [1, 2, 3, 4, 5]
+print("In the middle of Array --> O(n)")
+print(f"Before Delete: {arr}")
+index_to_be_deleted = 1
+for index in range(index_to_be_deleted, len(arr)-1):
+    arr[index] = arr[index+1]
+del arr[len(arr)-1]
+print(f"After Delete: {arr}")
+
+print("------------------------------------------------------------------------------")
+
+print("INSERT")
+# INSERTING IN AN ARRAY --> O(n)
+
+arr = [1, 2, 3, 4, 5]
+print("Inserting at an end --> O(1)")
+print(f"Before Delete: {arr}")
+arr.append(6)
+print(f"After Delete: {arr}")
+
+arr = [1, 2, 3, 4, 5]
+print("Inserting in the middle --> O(n)")
+index_to_be_inserted_at = 2
+element_to_be_inserted = 8
+print(f"Before Delete: {arr}")
+arr.append("place_holder_for_new_element")
+for i in range(len(arr)-1, index_to_be_inserted_at-1, -1):
+    arr[i] = arr[i-1]
+arr[index_to_be_inserted_at] = element_to_be_inserted
+print(f"After Delete: {arr}")