text: Pushing the adjacent cells in the queue that can be visited from the current cell
code: if ( i + arr [ i ] [ j ] < n ) q . push ( [ i + arr [ i ] [ j ] , j ] ) ; if ( j + arr [ i ] [ j ] < n ) q . push ( [ i , j + arr [ i ] [ j ] ] ) ; } depth ++ ; } return - 1 ; }