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 ; }