| from typing import List | |
| from collections import namedtuple | |
| status = namedtuple("Status", ["l_sum", "r_sum", "i_sum", "m_sum"]) | |
| class Solution: | |
| def maxSubArray(self, nums: List[int]) -> int: | |
| return self.get(nums, 0, len(nums) - 1).m_sum | |
| def push_up(self, l: status, r: status) -> status: | |
| return status( | |
| max(l.l_sum, l.i_sum + r.l_sum), | |
| max(r.r_sum, l.r_sum + r.i_sum), | |
| l.i_sum + r.i_sum, | |
| max(l.m_sum, l.r_sum + r.l_sum, r.m_sum), | |
| ) | |
| def get(self, arr: List[int], l: int, r: int) -> status: | |
| if l == r: | |
| return status(arr[l], arr[l], arr[l], arr[l]) | |
| m = (l + r) // 2 | |
| l_sub = self.get(arr, l, m) | |
| r_sub = self.get(arr, m + 1, r) | |
| return self.push_up(l_sub, r_sub) | |