diff --git a/semana23/aulaEstrutura/exercicio1.ts b/semana23/aulaEstrutura/exercicio1.ts
new file mode 100644
index 0000000..f33da26
--- /dev/null
+++ b/semana23/aulaEstrutura/exercicio1.ts
@@ -0,0 +1,25 @@
+export class LinkedList {
+    constructor(public start?: LinkedListNode) {}
+  
+    public appendToTail(value: number) {
+      if (!this.start) {
+        this.start = new LinkedListNode(value);
+      } else {
+        let node: LinkedListNode = this.start;
+        while (node && node.getNext() !== undefined) {
+          node = node.getNext()!;
+        }
+        node.setNext(new LinkedListNode(value));
+      }
+    }
+  
+    public print(): void {
+      let node: LinkedListNode | undefined = this.start;
+      let i = 1;
+      while (node !== undefined) {
+        console.log(`Elemento ${i}: `, node!.getData());
+        node = node!.getNext();
+        i++;
+      }
+    }
+  }
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diff --git a/semana23/aulaEstrutura/exercicio2.ts b/semana23/aulaEstrutura/exercicio2.ts
new file mode 100644
index 0000000..7afa96f
--- /dev/null
+++ b/semana23/aulaEstrutura/exercicio2.ts
@@ -0,0 +1,31 @@
+class Stack {
+    constructor(
+       public frames: LinkedList = new LinkedList()
+    ) { }
+ 
+    public isEmpty = (): boolean => this.frames.start === null
+ 
+    public push = (
+       value: any
+    ): void => {
+       this.frames.addToTail(value)
+    }
+ 
+    public pop = (): any => {
+       
+       if(!this.isEmpty()) return null
+ 
+       let previousNode: ListNode | null = null
+       let currentNode: ListNode | null = this.frames.start
+ 
+       while(currentNode!.next){
+          previousNode = currentNode
+          currentNode = currentNode!.next 
+       }
+ 
+       previousNode!.next = null
+ 
+       return currentNode
+ 
+    }
+ }
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diff --git a/semana23/aulaEstrutura/exercicio3.ts b/semana23/aulaEstrutura/exercicio3.ts
new file mode 100644
index 0000000..9dda9f4
--- /dev/null
+++ b/semana23/aulaEstrutura/exercicio3.ts
@@ -0,0 +1,27 @@
+class Queue {
+    constructor(
+       public items: any[] = []
+    ) { }
+ 
+    public isEmpty = (): boolean => this.items.length === 0
+ 
+    public enqueue = (
+       value: any
+    ): void => {
+       const index = this.items.length
+       this.items[index] = value
+    }
+ 
+    public dequeue = (): ListNode | null => {
+ 
+       const removedItem = this.items[0]
+ 
+       for (let i = 0; i < this.items.length; i++) {
+          this.items[i] = this.items[i + 1];
+       }
+ 
+       this.items.length--
+ 
+       return removedItem
+    }
+ }
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