Max sub-array slidey window

leetcode/stuff.py

@@ -535,3 +535,22 @@ def copy_random_list(
             ordered_copy[i].random = ordered_copy[hash_idx[hash(entry.random)]]
 
     return ordered_copy[0]
+
+
+def sum_max_sub_array(nums: list[int]) -> int:
+    window_size: int = 1
+    begin: int = 0
+    end: int = window_size
+    max_sum: int = sum(nums)
+
+    while end - begin <= len(nums):
+        while end < len(nums):
+            max_sum = max(max_sum, sum(nums[begin:end]))
+            begin += 1
+            end += 1
+
+        window_size += 1
+        begin = 0
+        end = window_size
+
+    return max_sum