Uber Interview Question for Software Engineer / Developers


Country: India
Interview Type: Written Test




Comment hidden because of low score. Click to expand.
0
of 0 vote

/**
     * @author Omid Ghiasi Tarzi
     */
public static void main(String args[] ) throws Exception {
        int[][] paths=new int[][]{
            new int[]{1,1,1,1},
            new int[]{1,1,1,1},
            new int[]{1,0,0,1},
            new int[]{1,1,1,1}
        };
        System.out.println(
            calculatePaths(paths,0,0,3,3)
            );
    }

    static int calculatePaths(int[][] path,int i,int j,int n,int m){
        if(i>n||j>m){
            return 0;
        }
        if(path[i][j]==0){
            return 0;
        }
        if(i==n&&j==m){
            return 1;
        }
        return calculatePaths(path,i+1,j,n,m)+calculatePaths(path,i,j+1,n,m);
    }

- omid095 October 12, 2019 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

a slightly modified DFS that starts at matrix[0,0] (or here, as per problem statement [1,1])
and every time you hit cell matrix[n,m], you increment the count

the modification is that every time you backtrack from cell X you remove the 'visited' tag from all cells you visited via X (this will clear up those cells to be part of another path)

- Anon November 25, 2019 | Flag Reply


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