Maximum Subarray.cpp

/*
Maximum Subarray
================

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

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 <= 3 * 104
-105 <= nums[i] <= 105

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
{
public:
  int maxSubArray(vector<int> &nums)
  {
    int ans = INT_MIN, curr = 0;
    for (int i = 0; i < nums.size(); ++i)
    {
      curr += nums[i];
      ans = max(ans, curr);
      if (curr < 0)
        curr = 0;
    }
    return ans;
  }
};