• O(1)空间复杂度, O(N)空间复杂度
class Solution {
public:
    int FindGreatestSumOfSubArray(vector<int> array) {
        int size = array.size();
        int ans=array[0];
        int dpi = array[0];
        int dpip1 = 0;
        for(int i=0; i<size-1; i++){
            dpip1 = array[i+1]+(dpi<0?0:dpi);
            ans = dpip1>ans?dpip1:ans;
            dpi = dpip1;
        }
        return ans;
    }
};