LeetCode-in-All
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.
Solution
public class Solution {
public int MaxSubArray(int[] nums) {
int maxSum = nums[0];
int curSum = 0;
for (int i = 0; i < nums.Length; i++) {
curSum += nums[i];
maxSum = Math.Max(curSum, maxSum);
if (curSum < 0) {
curSum = 0;
}
}
return maxSum;
}
}