diff --git a/semana23/aula70/index.ts b/semana23/aula70/index.ts
new file mode 100644
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+++ b/semana23/aula70/index.ts
@@ -0,0 +1,255 @@
+// Exercício 01
+class NodeItens {
+  constructor(public value: any, public next: NodeItens | null = null) {}
+}
+
+class LinkedList {
+  constructor(public head: NodeItens | null = null) {}
+
+  add(value: any): void {
+    if (!this.head) {
+      this.head = new NodeItens(value);
+      return;
+    }
+
+    let currentNode = this.head;
+
+    while (currentNode.next) {
+      currentNode = currentNode.next;
+    }
+
+    currentNode.next = new NodeItens(value);
+  }
+  search(value: any): NodeItens | null {
+    if (!this.head) {
+      return null;
+    }
+
+    let currentNode: NodeItens | null = this.head;
+
+    while (currentNode) {
+      if (currentNode.value === value) {
+        return currentNode;
+      }
+      currentNode = currentNode.next;
+    }
+
+    return currentNode;
+  }
+}
+
+//Gabarito
+// 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++;
+//     }
+//   }
+// }
+
+// Exercício 02
+class Stacks {
+  constructor(
+    private frame: any[] = [],
+    public length: number = 0,
+    public frames: LinkedList = new LinkedList()
+  ) {}
+
+  public isEmpty = (): boolean => this.frames.head === null;
+
+  push(item: any): void {
+    this.frame[this.frame.length] = item;
+    this.length++;
+  }
+
+  pop(): any {
+    const lastItem = this.frame[this.frame.length - 1];
+    this.frame.length--;
+    this.length--;
+    return lastItem;
+  }
+
+  peek(): any {
+    return this.frame[this.frame.length - 1];
+  }
+}
+
+// Gabarito
+// 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;
+//   };
+// }
+
+//Exercício 03
+class Queue {
+  constructor(private items: any[] = [], public length: number = 0) {}
+
+  enqueue(item: any): void {
+    this.items[this.items.length] = item;
+    this.length++;
+  }
+
+  dequeue(): any {
+    const firstItem = this.items[0];
+
+    for (let i = 0; i < this.items.length; i++) {
+      this.items[i] = this.items[i + 1];
+    }
+
+    this.items.length--; // Joga fora o último elemento
+    this.length--;
+    return firstItem;
+  }
+
+  front(): any {
+    return this.items[0];
+  }
+}
+
+//GABARITO
+// 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
+//   }
+// }
+
+//Gabarito Desafio
+export class DoublyLinkedList {
+  constructor(public start?: DoublyLinkedListNode) {}
+
+  public appendToTail(value: number) {
+    const newNode = new DoublyLinkedListNode(value);
+
+    if (!this.start) {
+      this.start = newNode;
+    } else {
+      let node = this.start;
+      while (node.getNext() !== undefined) {
+        node = node.getNext()!;
+      }
+      node.setNext(newNode);
+      newNode.setPrevious(node);
+    }
+  }
+
+  public print(): void {
+    let i = 1;
+    let node = this.start;
+    while (node !== undefined) {
+      console.log(`Elemento ${i}`);
+      console.log(" ", node);
+      node = node.getNext();
+      i++;
+    }
+    console.log();
+  }
+
+  public searchElement(value: number): DoublyLinkedListNode | undefined {
+    let node = this.start;
+    while (node !== undefined && node.value !== value) {
+      node = node.getNext();
+    }
+    return node;
+  }
+
+  public deleteElement(value: number): DoublyLinkedListNode | undefined {
+    let node = this.searchElement(value);
+    if (node) {
+      const previous = node.getPrevious();
+      const next = node.getNext();
+      if (next) {
+        next.setPrevious(previous);
+      }
+      if (previous) {
+        previous.setNext(next);
+      } else {
+        this.start = next;
+      }
+    }
+    return node;
+  }
+}
+
+export class DoublyLinkedListNode {
+  constructor(public value: number) {}
+
+  private previous?: DoublyLinkedListNode;
+  private next?: DoublyLinkedListNode;
+
+  public setPrevious(node?: DoublyLinkedListNode) {
+    this.previous = node;
+  }
+
+  public getPrevious(): DoublyLinkedListNode | undefined {
+    return this.previous;
+  }
+
+  public setNext(node?: DoublyLinkedListNode) {
+    this.next = node;
+  }
+
+  public getNext(): DoublyLinkedListNode | undefined {
+    return this.next;
+  }
+}