public class Block { public int id; // Number public int rank; // position in the Chain public Block next; // attributes

[answerhappygod]

public class Block {
public int id; // Number
public int rank; // position
in the Chain
public Block next;
// attributes to be added
public int size;
public Block(int id,
int rank) {
this.id = id;
this.rank = rank;
this.next = null;
// attributes to be added
}
public Block(int id,
int rank, Block next) {
this.id = id;
this.rank = rank;
this.next = next;
// attributes to be added
}
// Additional constructors may be added
// DO NOT MODIFY
public String toString() {
String str = "(" + id + ", " + rank + ")";
if (this.next ==
null) {
return str;
}
return str + " -> " + next.toString();
}
/**
*
* @return the number of Blocks in the Chain
that has an even ID.
*/
public int numberEvenBlocks()
{
return -1;
}
/**
*
* @return the number of Blocks in the Chain
that has an odd ID.
*/
public int numberOddBlocks() {
return -1;
}
/**
*
* @return true if the chain starting at the
current node is a valid Collatz
* chain and false otherwise. For a
chain to be valid, it needs to
* follow the 3n+1 rule but not
necessarily have a valid rank. The fast
* collatz chain should be treated as
invalid.
*/
public boolean isValid() {
return false;
}
/**
* IMPORTANT: Even thought this method is in the Block class, it
may be harder
* than most in the Chain class.
*
* @return true if the chain starting at the
current node is either a valid
* Collatz chain or a fast Collatz
chain. In this question, you also
* need to ensure that the rank is
valid. A valid rank starts at 1 and
* increases with one.
*/
public boolean
isValidAdvanced() {
return false;
}
}