From df3e7d09a2091c248f002ab3fa53946cee1a42db Mon Sep 17 00:00:00 2001 From: Andrei Jiroh Halili Date: Fri, 25 Sep 2026 09:56:36 +0000 Subject: [PATCH] emergency stash ahead Signed-off-by: Andrei Jiroh Halili --- .../agy-chat-export-202609251720.md | 847 ++++++++++++++++++ .../studentops/projects/dsaLabs/BST.java | 102 +++ .../studentops/projects/dsaLabs/BSTMain.java | 43 + .../studentops/projects/dsaLabs/BSTNode.java | 19 + 4 files changed, 1011 insertions(+) create mode 100644 archive/genai-toolkit/agy-chat-export-202609251720.md create mode 100644 java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java create mode 100644 java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java create mode 100644 java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java diff --git a/archive/genai-toolkit/agy-chat-export-202609251720.md b/archive/genai-toolkit/agy-chat-export-202609251720.md new file mode 100644 index 0000000..31ca30b --- /dev/null +++ b/archive/genai-toolkit/agy-chat-export-202609251720.md @@ -0,0 +1,847 @@ +# Antigravity CLI Transcript + +### Developer (9/25/2026, 9:18:21 AM) + + +I am trying to run @[java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java] in Google Cloud Shell Editor via the Java extension but I am getting the following errors, can you help me debug the problem? + +Exception in thread "main" java.lang.Error: Unresolved compilation problems: + The constructor BSTNode() is undefined + The method BSTNode(BSTNode) is undefined for the type BST + The method BSTNode(BSTNode) is undefined for the type BST + + at dev.andreijiroh.studentops.projects.dsaLabs.BST.(BST.java:10) + at dev.andreijiroh.studentops.projects.dsaLabs.BSTMain.main(BSTMain.java:11) + + +The current local time is: 2026-09-25T09:18:21Z. + +The user has mentioned some items in the form @[ITEM]. Here is extra information about the items that were mentioned by the user, in the order that they appear: + +@[java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java] is a [File]: +/home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java + + +The user changed setting `Model Selection` from None to Gemini 3.8 Flash (High). No need to comment on this change if the user doesn't ask about it. If reporting what model you are, please use a human readable name instead of the exact string. + + +--- + +### Antigravity Agent (9/25/2026, 9:18:26 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:18:26 AM) + +Created At: 2026-09-25T09:18:26Z +Completed At: 2026-09-25T09:18:27Z +Found 3 results +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java + +--- + +### Antigravity Agent (9/25/2026, 9:18:40 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:18:40 AM) + +Created At: 2026-09-25T09:18:40Z +Completed At: 2026-09-25T09:18:41Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java` +Total Lines: 97 +Total Bytes: 1893 +Showing lines 1 to 97 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: /** +4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms +5: * +6: * @author Andrei Jiroh Halili (STI College Meycauayan) +7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +8: */ +9: class BST { +10: BSTNode root = new BSTNode(); +11: +12: public void insert(int key) { +13: root = insertRec(root, key); +14: } +15: +16: private BSTNode insertRec(BSTNode n, int k) { +17: if (n == null) { +18: return new BSTNode(k); +19: }; +20: +21: if (k < n.key) { +22: n.left = insertRec(n.left, k); +23: } else if (k > n.key) { +24: n.right = insertRec(n.right, k); +25: }; +26: +27: return BSTNode(n); +28: } +29: +30: public boolean search(BSTNode n, int k) { +31: if (n == null) { +32: return false; +33: } +34: +35: if (n.key == k) { +36: return true; +37: } +38: +39: if (k < n.key) { +40: return search(n.left, k); +41: } else { +42: return search(n.right, k); +43: } +44: } +45: +46: public void deleteKey(int key) { +47: root = deleteRec(root, key); +48: } +49: +50: private BSTNode deleteRec(BSTNode n, int k) { +51: if (n == null) { +52: return new BSTNode(k); +53: }; +54: +55: if (k < n.key) { +56: n.left = deleteRec(n.left, k); +57: } else if (k > n.key) { +58: n.right = deleteRec(n.right, k); +59: } else { +60: if (n.left == null) { +61: return n.right; +62: } +63: +64: if (n.right == null) { +65: return n.left; +66: } +67: +68: n.key = minValue(n.right); +69: +70: n.right = deleteRec(n.right, n.key); +71: }; +72: +73: return BSTNode(n); +74: } +75: +76: +77: private int minValue(BSTNode n) { +78: while (n.left != null) { +79: n = n.left; +80: } +81: +82: return n.key; +83: } +84: +85: public void inorderPrint() { +86: inorder(root); +87: System.out.println(); +88: } +89: +90: private void inorder(BSTNode n) { +91: if (n != null) { +92: inorder(n.left); +93: System.out.print(n.key + " "); +94: inorder(n.right); +95: } +96: } +97: } +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:18:57 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:18:57 AM) + +Created At: 2026-09-25T09:18:57Z +Completed At: 2026-09-25T09:19:01Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java` +Total Lines: 20 +Total Bytes: 509 +Showing lines 1 to 20 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: /** +4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms +5: * +6: * @author Andrei Jiroh Halili (STI College Meycauayan) +7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java +8: */ +9: class BSTNode { +10: int key; +11: BSTNode left; +12: BSTNode right; +13: +14: BSTNode(int key) { +15: this.key = key; +16: left = null; +17: right = null; +18: } +19: } +20: +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:19:03 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:03 AM) + +Created At: 2026-09-25T09:19:03Z +Completed At: 2026-09-25T09:19:03Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java` +Total Lines: 21 +Total Bytes: 572 +Showing lines 1 to 21 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: /** +4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms +5: * +6: * @author Andrei Jiroh Halili (STI College Meycauayan) +7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +8: */ +9: public class BSTMain { +10: public static void main(String[] args) { +11: BST t = new BST(); +12: int[] vals = {50,30,70,20,40,60,80}; +13: +14: for (int v : vals) { +15: t.insert(v); +16: } +17: +18: t.inorderPrint(); +19: } +20: } +21: +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:19:08 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:08 AM) + +Created At: 2026-09-25T09:19:08Z +Completed At: 2026-09-25T09:19:08Z +Found 74 results +ComProg1.iml +build +build.xml +manifest.mf +nbproject +nbproject/build-impl.xml +nbproject/genfiles.properties +nbproject/private +nbproject/private/private.properties +nbproject/private/private.xml +nbproject/project.properties +nbproject/project.xml +src +src/dev +src/dev/andreijiroh +src/dev/andreijiroh/studentops +src/dev/andreijiroh/studentops/archive +src/dev/andreijiroh/studentops/archive/BloodData.java +src/dev/andreijiroh/studentops/archive/RunBloodData.java +src/dev/andreijiroh/studentops/archive/main2_20260326.java +src/dev/andreijiroh/studentops/archive/main_20260326.java +src/dev/andreijiroh/studentops/projects +src/dev/andreijiroh/studentops/projects/BarbershopService.java +src/dev/andreijiroh/studentops/projects/CarDemo.java +src/dev/andreijiroh/studentops/projects/ComProg2_Lab1.java +src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v1.java +src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v2.java +src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v3.java +src/dev/andreijiroh/studentops/projects/ComProg2_Lab3_p1.java +src/dev/andreijiroh/studentops/projects/ComProg2_PT1_v1.java +src/dev/andreijiroh/studentops/projects/ComProg2_PT1_v2.java +src/dev/andreijiroh/studentops/projects/ComProgActivity1.java +src/dev/andreijiroh/studentops/projects/ComProgActivity2.java +src/dev/andreijiroh/studentops/projects/ComProgPETA_netPay.java +src/dev/andreijiroh/studentops/projects/CreateBarbershop.java +src/dev/andreijiroh/studentops/projects/DivideDemo.java +src/dev/andreijiroh/studentops/projects/DivideDemo_v2.java +src/dev/andreijiroh/studentops/projects/DivisionMistakeCaught.java +src/dev/andreijiroh/studentops/projects/PETA_6_20260416.java +src/dev/andreijiroh/studentops/projects/PETA_labs_20260326_activity1.java +src/dev/andreijiroh/studentops/projects/PETA_labs_20260326_activity2.java +src/dev/andreijiroh/studentops/projects/ThreadActivity.java +src/dev/andreijiroh/studentops/projects/calucatorPrompts.java +src/dev/andreijiroh/studentops/projects/dsaLabs +src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java +src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java +src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java +src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java +src/dev/andreijiroh/studentops/projects/dsaLabs/Node.java +(...24 more results not shown) + +--- + +### Antigravity Agent (9/25/2026, 9:19:11 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:11 AM) + +Created At: 2026-09-25T09:19:11Z +Completed At: 2026-09-25T09:19:12Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java` +Total Lines: 63 +Total Bytes: 1399 +Showing lines 1 to 63 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: import java.util.ArrayDeque; +4: import java.util.ArrayList; +5: import java.util.List; +6: import java.util.Queue; +7: +8: /** +9: * @author Andrei Jiroh Halili (STI College Meycauayan) +10: * @see @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java +11: */ +12: class BinaryTree { +13: Node root; +14: +15: public void inorder(Node n, List out) { +16: if (n == null) { +17: return; +18: } +19: inorder(n.left, out); +20: out.add(n.data); +21: inorder(n.right, out); +22: } +23: +24: public void preorder(Node n, List out) { +25: if (n == null) { +26: return; +27: } +28: out.add(n.data); +29: preorder(n.left, out); +30: preorder(n.right, out); +31: } +32: +33: public void postorder(Node n, List out) { +34: if (n == null) { +35: return; +36: } +37: postorder(n.left, out); +38: postorder(n.right, out); +39: out.add(n.data); +40: } +41: +42: public List levelOrder (Node n) { +43: List out = new ArrayList<>(); +44: if (n == null) { +45: return out; +46: }; +47: +48: Queue q = new ArrayDeque<>(); +49: q.add(n); +50: +51: while (!q.isEmpty()) { +52: Node cur = q.remove(); +53: out.add(cur.data); +54: if (cur.left != null) { +55: q.add(cur.left); +56: } +57: if (cur.right != null) { +58: q.add(cur.right); +59: } +60: } +61: return out; +62: } +63: } +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:19:16 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:16 AM) + +Created At: 2026-09-25T09:19:16Z +Completed At: 2026-09-25T09:19:26Z + +The command exited with code 1. +Output: +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:10: error: constructor BSTNode in class BSTNode cannot be applied to given types; + BSTNode root = new BSTNode(); + ^ + required: int + found: no arguments + reason: actual and formal argument lists differ in length +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:27: error: cannot find symbol + return BSTNode(n); + ^ + symbol: method BSTNode(BSTNode) + location: class BST +java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:73: error: cannot find symbol + return BSTNode(n); + ^ + symbol: method BSTNode(BSTNode) + location: class BST +3 errors + + + +--- + +### Antigravity Agent (9/25/2026, 9:19:32 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:33 AM) + +Created At: 2026-09-25T09:19:33Z +Completed At: 2026-09-25T09:19:33Z + +The command exited with code 0. +Output: +On branch main +Your branch is up to date with 'origin/main'. + +Untracked files: + (use "git add ..." to include in what will be committed) + IncidentManagement.java + java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java + java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java + java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java + +nothing added to commit but untracked files present (use "git add" to track) + + + +--- + +### Antigravity Agent (9/25/2026, 9:19:38 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:39 AM) + +Created At: 2026-09-25T09:19:39Z +Completed At: 2026-09-25T09:19:39Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java` +Total Lines: 41 +Total Bytes: 1230 +Showing lines 1 to 41 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: import java.util.ArrayList; +4: import java.util.List; +5: +6: /** +7: * @author Andrei Jiroh Halili (STI College Meycauayan) +8: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java +9: */ +10: public class BTMain { +11: public static void main(String[] args) { +12: /** +13: * Initialize the root node first +14: */ +15: BinaryTree t = new BinaryTree(); +16: t.root = new Node(10); +17: t.root.left = new Node(5); +18: t.root.left.left = new Node(2); +19: t.root.left.right = new Node(7); +20: t.root.right = new Node(15); +21: t.root.right.left = new Node(12); +22: +23: /** +24: * Then the empty lists +25: */ +26: List in = new ArrayList<>(); +27: List pre = new ArrayList<>(); +28: List post = new ArrayList<>(); +29: List level = new ArrayList<>(); +30: +31: t.inorder(t.root, in); +32: t.preorder(t.root, pre); +33: t.postorder(t.root, post); +34: level = t.levelOrder(t.root); +35: +36: System.out.println("Inorder: "+in); +37: System.out.println("Preorder: "+pre); +38: System.out.println("Postorder: "+post); +39: System.out.println("Level order: "+level); +40: } +41: } +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:19:46 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:19:48 AM) + +Created At: 2026-09-25T09:19:48Z +Completed At: 2026-09-25T09:19:59Z +The following changes were made by the replace_file_content tool to: /home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java. If relevant, proactively run terminal commands to execute this code for the USER. Don't ask for permission. +[diff_block_start] +@@ -7,7 +7,7 @@ + * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java + */ + class BST { +- BSTNode root = new BSTNode(); ++ BSTNode root; + + public void insert(int key) { + root = insertRec(root, key); +@@ -23,7 +23,7 @@ + n.right = insertRec(n.right, k); + }; + +- return BSTNode(n); ++ return n; + } + + public boolean search(BSTNode n, int k) { +@@ -47,7 +47,7 @@ + + private BSTNode deleteRec(BSTNode n, int k) { + if (n == null) { +- return new BSTNode(k); ++ return null; + }; + + if (k < n.key) { +@@ -67,7 +67,7 @@ + n.right = deleteRec(n.right, n.key); + }; + +- return BSTNode(n); ++ return n; + } + + +[diff_block_end] + +Please note that the above snippet only shows the MODIFIED lines from the last change. It shows up to 3 lines of unchanged lines before and after the modified lines. The actual file contents may have many more lines not shown. + +--- + +### Antigravity Agent (9/25/2026, 9:20:11 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:20:11 AM) + +Created At: 2026-09-25T09:20:11Z +Completed At: 2026-09-25T09:20:20Z + +The command exited with code 0. +Output: +20 30 40 50 60 70 80 + + + +--- + +### Antigravity Agent (9/25/2026, 9:20:23 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:20:23 AM) + +Created At: 2026-09-25T09:20:23Z +Completed At: 2026-09-25T09:20:29Z + +The command exited with code 0. +Stdout: + +Stderr: + + + +--- + +### Antigravity Agent (9/25/2026, 9:20:33 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:20:33 AM) + +Created At: 2026-09-25T09:20:33Z +Completed At: 2026-09-25T09:20:33Z + +The command exited with code 0. +Stdout: + +Stderr: + + + +--- + +### Antigravity Agent (9/25/2026, 9:20:36 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:20:36 AM) + +Created At: 2026-09-25T09:20:36Z +Completed At: 2026-09-25T09:20:36Z + +The command exited with code 0. +Output: +?? IncidentManagement.java +?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java +?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java + + + +--- + +### Antigravity Agent (9/25/2026, 9:20:39 AM) + +undefined + +--- + +### Antigravity Agent (9/25/2026, 9:20:39 AM) + +Created At: 2026-09-25T09:20:39Z +Completed At: 2026-09-25T09:20:39Z +File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java` +Total Lines: 97 +Total Bytes: 1849 +Showing lines 1 to 97 +The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space. +1: package dev.andreijiroh.studentops.projects.dsaLabs; +2: +3: /** +4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms +5: * +6: * @author Andrei Jiroh Halili (STI College Meycauayan) +7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java +8: */ +9: class BST { +10: BSTNode root; +11: +12: public void insert(int key) { +13: root = insertRec(root, key); +14: } +15: +16: private BSTNode insertRec(BSTNode n, int k) { +17: if (n == null) { +18: return new BSTNode(k); +19: }; +20: +21: if (k < n.key) { +22: n.left = insertRec(n.left, k); +23: } else if (k > n.key) { +24: n.right = insertRec(n.right, k); +25: }; +26: +27: return n; +28: } +29: +30: public boolean search(BSTNode n, int k) { +31: if (n == null) { +32: return false; +33: } +34: +35: if (n.key == k) { +36: return true; +37: } +38: +39: if (k < n.key) { +40: return search(n.left, k); +41: } else { +42: return search(n.right, k); +43: } +44: } +45: +46: public void deleteKey(int key) { +47: root = deleteRec(root, key); +48: } +49: +50: private BSTNode deleteRec(BSTNode n, int k) { +51: if (n == null) { +52: return null; +53: }; +54: +55: if (k < n.key) { +56: n.left = deleteRec(n.left, k); +57: } else if (k > n.key) { +58: n.right = deleteRec(n.right, k); +59: } else { +60: if (n.left == null) { +61: return n.right; +62: } +63: +64: if (n.right == null) { +65: return n.left; +66: } +67: +68: n.key = minValue(n.right); +69: +70: n.right = deleteRec(n.right, n.key); +71: }; +72: +73: return n; +74: } +75: +76: +77: private int minValue(BSTNode n) { +78: while (n.left != null) { +79: n = n.left; +80: } +81: +82: return n.key; +83: } +84: +85: public void inorderPrint() { +86: inorder(root); +87: System.out.println(); +88: } +89: +90: private void inorder(BSTNode n) { +91: if (n != null) { +92: inorder(n.left); +93: System.out.print(n.key + " "); +94: inorder(n.right); +95: } +96: } +97: } +The above content shows the entire, complete file contents of the requested file. + + +--- + +### Antigravity Agent (9/25/2026, 9:20:44 AM) + +The errors occurred because of three syntax and logic issues in [BST.java](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java): + +--- + +### Root Cause Analysis + +1. **`The constructor BSTNode() is undefined` ([BST.java:10](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L10))** + - [`BSTNode`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java#L9) defines [`BSTNode(int key)`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java#L14), so Java does not generate a default no-argument constructor. + - An empty Binary Search Tree begins with `root = null` (not an instantiated node). Declaring `BSTNode root = new BSTNode();` would also create a node with key `0` and break insertions. + +2. **`The method BSTNode(BSTNode) is undefined for the type BST` ([BST.java:27](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L27) & [BST.java:73](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L73))** + - Writing `return BSTNode(n);` is treated by the Java compiler as calling an instance method named `BSTNode(...)` on [`BST`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L9). + - In both [`insertRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L16) and [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50), you should return the current node pointer: `return n;`. + +3. **Base case in [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50)** + - In [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50), `if (n == null) return new BSTNode(k);` would insert a new node when deleting a non-existent key. It was changed to `return null;`. + +--- + +### Changes Applied to [BST.java](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java) + +```diff + class BST { +- BSTNode root = new BSTNode(); ++ BSTNode root; + + public void insert(int key) { + root = insertRec(root, key); + } + + private BSTNode insertRec(BSTNode n, int k) { + if (n == null) { + return new BSTNode(k); + }; + + if (k < n.key) { + n.left = insertRec(n.left, k); + } else if (k > n.key) { + n.right = insertRec(n.right, k); + }; + +- return BSTNode(n); ++ return n; + } + + public boolean search(BSTNode n, int k) { +... + private BSTNode deleteRec(BSTNode n, int k) { + if (n == null) { +- return new BSTNode(k); ++ return null; + }; + + if (k < n.key) { + n.left = deleteRec(n.left, k); + } else if (k > n.key) { + n.right = deleteRec(n.right, k); + } else { +... + }; + +- return BSTNode(n); ++ return n; + } +``` + +### Verification + +Running [`BSTMain`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java#L9) now compiles and produces the expected sorted in-order traversal: + +```text +20 30 40 50 60 70 80 +``` + +--- + diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java new file mode 100644 index 0000000..08eadef --- /dev/null +++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java @@ -0,0 +1,102 @@ +package dev.andreijiroh.studentops.projects.dsaLabs; + +/** + * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms + * + * AI use disclosure: Gemini Flash (High) via Google Antigravity CLI was used for debugging + * the undefined BSTNode() constructor error at L13 by simply declaring the root variable without + * doing new BSTNode() part (which also creates a fresh node with key 0 and breaking future insertions). + * See archive/genai-toolkit/agy-chat-export-202609251720.md in the repo root for details. + * + * @author Andrei Jiroh Halili (STI College Meycauayan) + * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java + */ +class BST { + BSTNode root; + + public void insert(int key) { + root = insertRec(root, key); + } + + private BSTNode insertRec(BSTNode n, int k) { + if (n == null) { + return new BSTNode(k); + }; + + if (k < n.key) { + n.left = insertRec(n.left, k); + } else if (k > n.key) { + n.right = insertRec(n.right, k); + }; + + return n; + } + + public boolean search(BSTNode n, int k) { + if (n == null) { + return false; + } + + if (n.key == k) { + return true; + } + + if (k < n.key) { + return search(n.left, k); + } else { + return search(n.right, k); + } + } + + public void deleteKey(int key) { + root = deleteRec(root, key); + } + + private BSTNode deleteRec(BSTNode n, int k) { + if (n == null) { + return null; + }; + + if (k < n.key) { + n.left = deleteRec(n.left, k); + } else if (k > n.key) { + n.right = deleteRec(n.right, k); + } else { + if (n.left == null) { + return n.right; + } + + if (n.right == null) { + return n.left; + } + + n.key = minValue(n.right); + + n.right = deleteRec(n.right, n.key); + }; + + return n; + } + + + private int minValue(BSTNode n) { + while (n.left != null) { + n = n.left; + } + + return n.key; + } + + public void inorderPrint() { + inorder(root); + System.out.println(); + } + + private void inorder(BSTNode n) { + if (n != null) { + inorder(n.left); + System.out.print(n.key + " "); + inorder(n.right); + } + } +} \ No newline at end of file diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java new file mode 100644 index 0000000..c4819f9 --- /dev/null +++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java @@ -0,0 +1,43 @@ +package dev.andreijiroh.studentops.projects.dsaLabs; + +/** + * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms + * + * @author Andrei Jiroh Halili (STI College Meycauayan) + * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java + */ +public class BSTMain { + public static void main(String[] args) { + BST t = new BST(); + int[] vals = {50,30,70,20,40,60,80}; + + for (int v : vals) { + t.insert(v); + } + t.inorderPrint(); + + if (t.search(t.root, 40)) { + System.out.println("Search 40: Found"); + } else { + System.out.println("Search 40: Not Found"); + } + + if (t.search(t.root, 100)) { + System.out.println("Search 100: Found"); + } else { + System.out.println("Search 100: Not Found"); + } + + t.deleteKey(20); + System.out.print("After deleting 20: "); + t.inorderPrint(); + + t.deleteKey(30); + System.out.print("After deleting 30: "); + t.inorderPrint(); + + t.deleteKey(50); + System.out.print("After deleting 50: "); + t.inorderPrint(); + } +} diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java new file mode 100644 index 0000000..e1e3957 --- /dev/null +++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java @@ -0,0 +1,19 @@ +package dev.andreijiroh.studentops.projects.dsaLabs; + +/** + * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms + * + * @author Andrei Jiroh Halili (STI College Meycauayan) + * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java + */ +class BSTNode { + int key; + BSTNode left; + BSTNode right; + + BSTNode(int key) { + this.key = key; + left = null; + right = null; + } +} -- 2.51.2