adding algo

src/my_project/interviews/amazon_high_frequency_23/common_algos/two_sum_round_5.py

@@ -0,0 +1,17 @@
+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 []
+

src/my_project/interviews/amazon_high_frequency_23/common_algos/valid_palindrome_round_5.py

@@ -0,0 +1,23 @@
+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='[^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 

src/my_project/interviews/amazon_high_frequency_23/round_3/maximum_sum_distinct_subarrays_lenght_k.py

@@ -0,0 +1,26 @@
+from typing import List, Union, Collection, Mapping, Optional
+
+class Solution:
+    def maximumSubarraySum(self, nums: List[int], k: int) -> int:
+        max_sum = 0
+        current_sum = 0
+        freq_sum = dict()
+        left = 0
+
+        for right in range(len(nums)):
+            current_sum += nums[right]
+
+            freq_sum[nums[right]] = freq_sum.get(nums[right], 0) + 1
+
+            if right - left > k - 1:
+                freq_sum[nums[left]] -= 1
+                if freq_sum[nums[left]] == 0:
+                    del freq_sum[nums[left]]                
+                current_sum -= nums[left] 
+                left += 1
+
+            if right - left == k - 1 and len(freq_sum) == k:
+                max_sum = max(max_sum, current_sum)
+
+        return max_sum
+

src/my_project/interviews/amazon_high_frequency_23/round_3/merge_intervals.py

@@ -0,0 +1,16 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def merge(self, intervals: List[List[int]]) -> List[List[int]]:
+
+        list_answer = list()
+
+        for i in sorted(intervals, key=lambda x: x[0]):
+
+            if list_answer and i[0] <= list_answer[-1][-1]:
+                list_answer[-1][-1] = max(list_answer[-1][-1], i[-1])
+            else:
+                list_answer.append(i)
+
+        return list_answer

src/my_project/interviews/top_150_questions_round_21/valid_parentheses.py

@@ -0,0 +1,20 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isValid(self, s):
+
+        dic_parentheses = {'(':')','[':']','{':'}'}
+
+        check_list = list()
+
+        for p in s:
+
+            if p in dic_parentheses:
+                check_list.append(p)
+            else:
+                if len(check_list) == 0 \
+                    or dic_parentheses[check_list.pop()] != p:
+                    return False 
+
+        return len(check_list) == 0

tests/test_150_questions_round_21/test_valid_parentheses_round_21.py

@@ -0,0 +1,20 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_21\
+.valid_parentheses import Solution
+
+class ValidParenthesesTestCase(unittest.TestCase):
+
+    def test_is_valid_parentheses(self):
+        solution = Solution()
+        output = solution.isValid(s='()')
+        self.assertTrue(output)
+
+    def test_is_no_valid_parentheses_pattern_1(self):
+        solution = Solution()
+        output = solution.isValid(s='(]')
+        self.assertFalse(output)
+
+    def test_is_no_valid_parentheses_pattern_2(self):
+        solution = Solution()
+        output = solution.isValid(s='((')
+        self.assertFalse(output)