807. 保持城市天际线

力扣

class Solution {
public:
    int maxIncreaseKeepingSkyline(vector>& grid) {
        vectorv1;
        vectorv2;
        int max1=-1;
        int max2=-1;
        int sum=0;
        int oldsum=0;
        for(int i=0;iv2[j]?v2[j]:v1[i];

            }
        }
        return sum-oldsum;
    }
};