Create cutting-ribbons.py

Author: kamyu104

Python/cutting-ribbons.py

@@ -0,0 +1,21 @@
+# Time:  O(nlogr), r is sum(ribbons)/k
+# Space: O(1)
+
+class Solution(object):
+    def maxLength(self, ribbons, k):
+        """
+        :type ribbons: List[int]
+        :type k: int
+        :rtype: int
+        """
+        def check(ribbons, k, s):
+            return reduce(lambda total,x: total+x//s, ribbons, 0) >= k
+
+        left, right = 1, sum(ribbons)//k
+        while left <= right:
+            mid = left + (right-left)//2
+            if not check(ribbons, k, mid):
+                right = mid-1
+            else:
+                left = mid+1
+        return right