protected Node < K , V > unlinkRightChild ( Node < K , V > n ) { Node < K , V > left = n . o_c ; if ( left == null || left . y_s == n ) { return null ; } Node < K , V > right = left . y_s ; left . y_s = n ; right . y_s = null ; return right ; }
Unlink the right child of a node .