Create capacity-to-ship-packages-within-d-days.py

Author: kamyu104

Python/capacity-to-ship-packages-within-d-days.py

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+# Time:  O(nlogr)
+# Space: O(1)
+
+class Solution(object):
+    def shipWithinDays(self, weights, D):
+        """
+        :type weights: List[int]
+        :type D: int
+        :rtype: int
+        """
+        def possible(weights, D, mid):
+            result, curr = 1, 0
+            for w in weights:
+                if curr+w > mid:
+                    result += 1
+                    curr = 0
+                curr += w
+            return result <= D
+    
+        left, right = max(weights), sum(weights)
+        while left <= right:
+            mid = left + (right-left)//2
+            if possible(weights, D, mid):
+                right = mid-1
+            else:
+                left = mid+1
+        return left