add some exs

interview_cake/strings/palindrome.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+"""
+Write an efficient function that checks whether 
+any permutation of an input string is a palindrome.
+"""
+
+def has_palindrome_permutation(the_string):
+    unpaired_characters = set()
+
+    for char in the_string:
+        if char in unpaired_characters:
+            unpaired_characters.remove(char)
+        else:
+            unpaired_characters.add(char)
+
+    return len(unpaired_characters) <= 1
+
+str1 = "civic"
+print has_palindrome_permutation(str1)
+print "Should be True"
+
+str2 = "ivilc"
+print has_palindrome_permutation(str2)
+print "Should be False"

interview_cake/strings/reverse_in_place.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+
+"""
+Write a function that takes a list of characters and reverses the letters in place.
+O(n) time and O(1)O(1) space.
+"""
+
+def reverse_in_place(char_list):
+    return char_list[::-1]
+
+
+char_list = ['a', 'b', 'c', 'd', 'e', 'f']
+
+
+
+print(char_list)
+print(reverse_in_place(char_list))