def max_subarray_sum(arr):
if not arr:
return 0
cur_sum = max_sum = arr[0]
for num in arr[1:]:
cur_sum = max(num, cur_sum + num)
max_sum = max(max_sum, cur_sum)
return max_sum
# 输入部分(假设通过input()函数获取)
n = int(input())
nums = list(map(int, input().split()))
result = max_subarray_sum(nums)
print(result)



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