Finish problem 1011-capacity-to-ship-packages-within-d-days

2026-07-23 13:56:14 -05:00
parent 13e85849b3
commit 25956cc25b
2 changed files with 42 additions and 0 deletions
@@ -0,0 +1,23 @@
+def days_needed(weights: list[int], s: int) -> int:
+    days = 1
+    capacity = s
+    for weight in weights:
+        if capacity - weight >= 0:
+            capacity -= weight
+        else:
+            capacity = s - weight
+            days += 1
+    return days
+
+
+class Solution:
+    def shipWithinDays(self, weights: list[int], days: int) -> int:
+        lo, hi = max(weights), sum(weights)
+        while lo < hi:
+            s = (lo + hi) // 2
+            if days_needed(weights, s) > days:
+                lo = s + 1
+            else:
+                hi = s
+
+        return lo
@@ -0,0 +1,19 @@
+import pytest
+from solution import Solution
+
+
+@pytest.mark.parametrize(
+    "weights,days,expected",
+    [
+        ([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 5, 15),
+        ([3, 2, 2, 4, 1, 4], 3, 6),
+        ([1, 2, 3, 1, 1], 4, 3),
+        ([1], 1, 1),
+        ([5, 5, 5, 5], 4, 5),
+        ([5, 5, 5, 5], 1, 20),
+        ([10, 50, 100, 100, 50, 10], 1, 320),
+        ([10, 50, 100, 100, 50, 10], 6, 100),
+    ],
+)
+def test_ship_within_days(weights, days, expected):
+    assert Solution().shipWithinDays(weights, days) == expected