maximum-subarray 序列最大连续和 贪心

Posted 2021-01-06 zl1991

Find the contiguous subarray within an array (containing at least one number) which has the largest sum.

For example, given the array[?2,1,?3,4,?1,2,1,?5,4],
the contiguous subarray[4,?1,2,1]has the largest sum =6.

click to show more practice.

More practice:

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

贪心算法，当连续和sum>0时，sum+=A[i],负责sum=A[i]

class Solution {
public:
    int maxSubArray(int A[], int n) {
        int max=A[0],sum=0;
        for(int i=0;i<n;++i)
        {
            if(sum<0)
                sum=A[i];
            else
                sum+=A[i];
            max=max<sum?sum:max;
        }
        return max;
    }
};