Cabebe Spruce C16

hash_practice/exercises.py

@@ -2,18 +2,51 @@
 def grouped_anagrams(strings):
     """ This method will return an array of arrays.
         Each subarray will have strings which are anagrams of each other
-        Time Complexity: ?
-        Space Complexity: ?
+        Time Complexity: O(n)
+        Space Complexity: O(n)
     """
-    pass
+    anagrams_map = {}
+    if not strings:
+        return []
+
+    for string in strings: 
+        letters_in_string = ''.join(sorted(string))
+        if letters_in_string in anagrams_map:
+            anagrams_map[letters_in_string].append(string)
+        else:
+            anagrams_map[letters_in_string] = [string]
+
+    anagrams = []
+    for item in anagrams_map.values():
+        anagrams.append(item)
+
+    return anagrams
+
+
 
 def top_k_frequent_elements(nums, k):
     """ This method will return the k most common elements
         In the case of a tie it will select the first occuring element.
-        Time Complexity: ?
-        Space Complexity: ?
+        Time Complexity: O(n)
+        Space Complexity: O(n)
     """
-    pass
+    element_map = {}
+    for num in nums:
+        if num not in element_map:
+            element_map[num] = 1
+        else:
+            element_map[num] += 1
+
+    most_common = []
+    value_list = list(element_map.values())
+    for key, value in element_map.items():
+        if value == max(value_list):
+            most_common.append(key)
+            value_list.remove(value)
+        if len(most_common) == k:
+            break
+
+    return most_common
 
 
 def valid_sudoku(table):