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2244-minimum-rounds-to-complete-all-tasks/2244-minimum-rounds-to-complete-all-tasks.py

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+class Solution(object):
+    def minimumRounds(self, tasks):
+        """
+        :type tasks: List[int]
+        :rtype: int
+        """
+        # Counts the number of iterations of each difficulty
+        countByDifficulty = {}
+        for dif in tasks:
+            if dif not in countByDifficulty:
+                countByDifficulty[dif] = 0
+            countByDifficulty[dif] += 1
+            
+        # Count the amount of rounds required to complete
+        roundsRequired = 0
+        for count in countByDifficulty.values():
+            if count == 1:
+                return -1
+            
+            if count % 3 == 0:
+                roundsRequired += count / 3
+            else:
+                ## Examples: 7 (rem 1), 8 (rem 2)
+                # 7 = 3+2+2
+                # 8 = 3+3+2
+                roundsRequired += int(count / 3) + 1 
+                
+        return roundsRequired
+