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Assignment 8: bst solve

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This commit is contained in:
Yuri Tatishchev 2025-03-31 21:38:46 -07:00
parent 99055cd188
commit a53268bb3e
Signed by: CaZzzer
GPG Key ID: E0EBF441EA424369
1 changed files with 105 additions and 5 deletions
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110
08-labBST/Assignment.java
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@ -24,11 +24,96 @@ public class Assignment {
} }
public void insert(int toInsert) { public void insert(int toInsert) {
// Insert the provided element into the tree // Insert the provided element into the tree
Node newNode = new Node();
newNode.val = toInsert;
if (root == null) {
root = newNode;
return;
}
Node parent = root;
while (newNode.parent == null) {
if (toInsert < parent.val) {
if (parent.left == null) {
parent.left = newNode;
newNode.parent = parent;
} else {
parent = parent.left;
}
} else {
if (parent.right == null) {
parent.right = newNode;
newNode.parent = parent;
} else {
parent = parent.right;
}
}
}
} }
public void delete(int toDelete) { public void delete(int toDelete) {
// Delete the provided element from the tree // Delete the provided element from the tree
Node toDeleteNode = root;
while (toDeleteNode != null && toDeleteNode.val != toDelete) {
if (toDelete < toDeleteNode.val) {
toDeleteNode = toDeleteNode.left;
} else {
toDeleteNode = toDeleteNode.right;
}
}
// case 0: Node not found or tree is empty
if (toDeleteNode == null) {
return;
}
// case 1: Node has no children
if (toDeleteNode.left == null && toDeleteNode.right == null) {
if (toDeleteNode.parent == null) {
root = null;
} else if (toDeleteNode.parent.left == toDeleteNode) {
toDeleteNode.parent.left = null;
} else {
toDeleteNode.parent.right = null;
}
return;
}
// case 2: Node has one child
if (toDeleteNode.left == null || toDeleteNode.right == null) {
Node child = toDeleteNode.left == null ? toDeleteNode.right : toDeleteNode.left;
if (toDeleteNode.parent == null) {
root = child;
} else if (toDeleteNode.parent.left == toDeleteNode) {
toDeleteNode.parent.left = child;
} else {
toDeleteNode.parent.right = child;
}
return;
}
// case 3: Node has two children
Node successor = toDeleteNode.right;
while (successor.left != null) {
successor = successor.left;
}
// remove successor from its current position
if (successor.parent.left == successor) {
successor.parent.left = successor.right;
} else {
successor.parent.right = successor.right;
}
// replace toDeleteNode with successor
successor.parent = toDeleteNode.parent;
successor.left = toDeleteNode.left;
successor.right = toDeleteNode.right;
if (toDeleteNode.parent == null) {
root = successor;
} else if (toDeleteNode.parent.left == toDeleteNode) {
toDeleteNode.parent.left = successor;
} else {
toDeleteNode.parent.right = successor;
}
} }
@ -47,17 +132,32 @@ public class Assignment {
} }
private void inOrder(Node curr) { private void inOrder(Node curr) {
// Print the elements in the tree one one each line // Print the elements in the tree one on each line
if (curr == null) {
return;
}
inOrder(curr.left);
System.out.println(curr.val); System.out.println(curr.val);
inOrder(curr.right);
} }
private void preOrder(Node curr) { private void preOrder(Node curr) {
// Print the elements in the tree one one each line // Print the elements in the tree one on each line
if (curr == null) {
return;
}
System.out.println(curr.val); System.out.println(curr.val);
preOrder(curr.left);
preOrder(curr.right);
} }
private void postOrder(Node curr) { private void postOrder(Node curr) {
// Print the elements in the tree one one each line // Print the elements in the tree one on each line
if (curr == null) {
return;
}
postOrder(curr.left);
postOrder(curr.right);
System.out.println(curr.val); System.out.println(curr.val);
} }
} }