from math import inf

def maxSubArray(nums):
    max_sum = nums[0]
    current_sum = nums[0]

    for n in nums[1:]:
        if current_sum < 0:
            current_sum = 0
        current_sum += n
        if current_sum > max_sum:
            max_sum = current_sum
    return max_sum
    
if __name__ == "__main__":
    print(maxSubArray([-2,1]))