Back to writing

53. Maximum Subarray

53. Maximum Subarray

Easy


Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.

A subarray is a contiguous part of an array.

 

Example 1:

Input: nums = [-2,1,-3,4,-1,2,1,-5,4]
Output: 6
Explanation: [4,-1,2,1] has the largest sum = 6.

Example 2:

Input: nums = [1]
Output: 1

Example 3:

Input: nums = [5,4,-1,7,8]
Output: 23

 

Constraints:

  • 1 <= nums.length <= 105
  • -104 <= nums[i] <= 104

 

Follow up: If you have figured out the O(n) solution, try coding another solution using the divide and conquer approach, which is more subtle.


 class Solution:
    def maxSubArray(self, nums: List[int]) -> int:
        current_sum = max_sum = nums[0]
        for num in nums[1:]:
            current_sum = max(num, current_sum+num)
            max_sum = max(max_sum, current_sum)

        return max_sum

Need continuous some smaller/larger value? Use heap max or min as you need.

Heap
Link →