adding algo

src/my_project/interviews/top_150_questions_round_22/ex_42_group_anagrams.py

@@ -0,0 +1,13 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+from collections import defaultdict
+
+class Solution:
+    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
+
+        answer = defaultdict(list)
+
+        for word in strs:
+            answer[''.join(sorted(word))].append(word)
+
+        return list(answer.values())

src/my_project/interviews/top_150_questions_round_22/ex_43_two_sum.py

@@ -0,0 +1,16 @@
+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/top_150_questions_round_22/ex_44_happy_number.py

@@ -0,0 +1,18 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution(object):
+    def isHappy(self, n):
+
+        set_answer = set()
+
+        while n != 1:
+
+            if n in set_answer:
+                return False 
+            else:
+                set_answer.add(n)
+
+            n = sum([int(c)**2 for c in str(n)])
+
+        return True 

tests/test_150_questions_round_22/test_42_group_anagrams_round_22.py

@@ -0,0 +1,23 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_42_group_anagrams import Solution
+
+class GroupAnagramsTestCase(unittest.TestCase):
+
+    def test_first_pattern(self):
+        solution = Solution()
+        output = solution.groupAnagrams(strs = ["eat","tea","tan","ate","nat","bat"])
+        target = [['eat', 'tea', 'ate'], ['tan', 'nat'], ['bat']]
+        self.assertEqual(output, target)
+
+    def test_second_pattern(self):
+        solution = Solution()
+        output = solution.groupAnagrams(strs = [""])
+        target = [[""]]
+        self.assertEqual(output, target)
+
+    def test_third_pattern(self):
+        solution = Solution()
+        output = solution.groupAnagrams(strs = ["a"])
+        target = [["a"]]
+        self.assertEqual(output, target)

tests/test_150_questions_round_22/test_43_two_sum_round_22.py

@@ -0,0 +1,18 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_43_two_sum import Solution
+
+class TwoSumTestCase(unittest.TestCase):
+
+    def test_is_two_sum(self):
+        solution = Solution()
+        output = solution.twoSum(nums=[2,7,11,15], target=9)
+        target = [0,1]
+        for k, v in enumerate(target):
+            self.assertEqual(v, output[k])
+
+    def test_is_no_two_sum(self):
+        solution = Solution()
+        output = solution.twoSum(nums=[2,7,11,15], target=0)
+        target = []
+        self.assertEqual(output, target)

tests/test_150_questions_round_22/test_44_happy_number_round_22.py

@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_44_happy_number import Solution
+
+class HappyNumberTestCase(unittest.TestCase):
+
+    def test_is_happy_number(self):
+        solution = Solution()
+        output = solution.isHappy(n=19)
+        self.assertTrue(output)
+
+    def test_is_no_happy_number(self):
+        solution = Solution()
+        output = solution.isHappy(n=2)
+        self.assertFalse(output)