diff --git a/src/my_project/interviews/amazon_high_frequency_23/common_algos/two_sum_round_4.py b/src/my_project/interviews/amazon_high_frequency_23/common_algos/two_sum_round_4.py
new file mode 100644
index 00000000..596113de
--- /dev/null
+++ b/src/my_project/interviews/amazon_high_frequency_23/common_algos/two_sum_round_4.py
@@ -0,0 +1,19 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+
+        answer = dict()
+
+        for k, v in enumerate(nums):
+
+            if v in answer:
+                return [answer[v], k]
+            else: 
+                answer[target - v] = k 
+
+        return []
+            
+        
+
diff --git a/src/my_project/interviews/amazon_high_frequency_23/common_algos/valid_palindrome_round_4.py b/src/my_project/interviews/amazon_high_frequency_23/common_algos/valid_palindrome_round_4.py
new file mode 100644
index 00000000..d07f3a55
--- /dev/null
+++ b/src/my_project/interviews/amazon_high_frequency_23/common_algos/valid_palindrome_round_4.py
@@ -0,0 +1,22 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+import re
+
+class Solution:
+    def isPalindrome(self, s: str) -> bool:
+
+        # To lowercase
+        s = s.lower()
+
+        # Remove non-alphanumeric characters
+        s = re.sub(pattern=r'[^a-zA-Z0-9]', repl='', string=s)
+
+        # Determine if s is palindrome or not 
+        len_s = len(s)
+
+        for i in range(len_s//2):
+
+            if s[i] != s[len_s - 1 - i]:
+                return False 
+            
+        return True 
\ No newline at end of file
diff --git a/src/my_project/interviews/amazon_high_frequency_23/round_6/kids_with_the_greates_number_of_candies.py b/src/my_project/interviews/amazon_high_frequency_23/round_6/kids_with_the_greates_number_of_candies.py
new file mode 100644
index 00000000..10c4e537
--- /dev/null
+++ b/src/my_project/interviews/amazon_high_frequency_23/round_6/kids_with_the_greates_number_of_candies.py
@@ -0,0 +1,13 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def kidsWithCandies(self, candies: List[int], 
+                        extraCandies: int) -> List[bool]:
+        max_candies = max(candies)
+        return [c + extraCandies >= max_candies for c in candies]
+
+
+
+        
+