From 4964efd52f00f008fa5e01fb53bf913f2ebdcdae Mon Sep 17 00:00:00 2001
From: Bluenzo <80460870+Bluenzo@users.noreply.github.com>
Date: Mon, 2 Jun 2025 14:33:37 -0700
Subject: [PATCH 1/2] 1 left

---
 src/Exercises.java | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/Exercises.java b/src/Exercises.java
index 0da86bf..b120ee3 100644
--- a/src/Exercises.java
+++ b/src/Exercises.java
@@ -12,7 +12,14 @@ public class Exercises {
      * @return sum of the values in the list
      */
     public static int sum(ListNode head) {
-        return -1;
+        int total = 0;
+
+        while(head != null){
+            total += head.data;
+            head = head.next;
+        }
+
+        return total;
     }
 
     /**
@@ -28,7 +35,16 @@ public static int sum(ListNode head) {
      * @return a count of the negative values in the list
      */
     public static int countNegative(ListNode head) {
-        return -1;
+
+        int count = 0;
+        
+        while(head != null){
+            if(head.data < 0){
+                count++;
+            }
+            head = head.next;
+        }
+        return count;
     }
 
     /**
@@ -46,6 +62,16 @@ public static int countNegative(ListNode head) {
      * @param toAdd the value to append in a new node
      */
     public static void addToEnd(ListNode head, int toAdd) {
+        if (head == null){
+            return;
+        }
+        
+        ListNode current = head;
+        while (current.next != null){
+            current = current.next;
+        }
+
+        current.next = new ListNode(toAdd);
 
     }
 
@@ -63,6 +89,18 @@ public static void addToEnd(ListNode head, int toAdd) {
      */
     public static void makePositive(ListNode head) {
 
+        if (head == null){
+            return;
+        }
+
+        ListNode current = head;
+        while(current != null){
+            if(current.data < 0){
+                current.data = -current.data;
+            }
+            current = current.next;
+        }
+
     }
 
     /**

From 623b028278b969466a811df58b06b127561153e4 Mon Sep 17 00:00:00 2001
From: Bluenzo <80460870+Bluenzo@users.noreply.github.com>
Date: Mon, 2 Jun 2025 23:11:18 -0700
Subject: [PATCH 2/2] Done!

---
 src/Exercises.java | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/Exercises.java b/src/Exercises.java
index b120ee3..bd5a865 100644
--- a/src/Exercises.java
+++ b/src/Exercises.java
@@ -120,6 +120,19 @@ public static void makePositive(ListNode head) {
      * @return whether the list is increasing
      */
     public static boolean isIncreasing(ListNode head) {
-        return false;
+
+        if (head == null || head.next == null){
+            return true;
+        }
+
+        ListNode current = head;
+
+        while(current.next != null){
+            if(current.data > current.next.data){
+                return false;
+            }
+            current = current.next;
+        }
+        return true;
     }
 }