LeetCode2125

class Solution {

public:

    int numberOfBeams(vector<string>& bank) {

        int res=0;

        int up=0;

        int down=0;

        for(int i=0;i<bank.size();i++)

        {

            for(int j=0;j<bank[0].size();j++)

            {

                if(bank[i][j]=='1')

                {

                    down++;

                }

            }

            if(down!=0)

            {

                res+=up*down;

                up=down;

                down=0;

            }

        }

        return res;

    }

};