Create minimum-rounds-to-complete-all-tasks.py

Author: kamyu104

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

@@ -0,0 +1,15 @@
+# Time:  O(n)
+# Space: O(n)
+
+import collections
+
+
+# math, freq table
+class Solution(object):
+    def minimumRounds(self, tasks):
+        """
+        :type tasks: List[int]
+        :rtype: int
+        """
+        cnt = collections.Counter(tasks)
+        return sum((x+2)//3 for x in cnt.itervalues()) if 1 not in cnt.itervalues() else -1