🟢 Solve problem 83

Author: AF2B

typescript/deleteDuplicates.ts

@@ -0,0 +1,41 @@
+class ListNode {
+    val: number;
+    next: ListNode | null;
+    
+    constructor(val?: number, next?: ListNode | null) {
+        this.val = val === undefined ? 0 : val;
+        this.next = next === undefined ? null : next;
+    }
+}
+
+const auxRemoveDuplicates = (node: ListNode | null): ListNode | null => {
+    if (!node?.next) {
+        return node;
+    }
+
+    const valueToRemove: number = node.val;
+
+    while (node.next && node.next.val === valueToRemove) {
+        node.next = node.next.next;
+    }
+    
+    return node;
+};
+
+const deleteDuplicates = (head: ListNode | null): ListNode | null => {
+    if (!head?.next) {
+        return head;
+    }
+
+    let current: ListNode | null = head;
+    
+    while (current?.next) {
+        if (current.val === current.next.val) {
+            current = auxRemoveDuplicates(current);
+        } else {
+            current = current.next;
+        }
+    }
+    
+    return head;
+};