Approve or Approve of? [closed]

What is the correct way of saying the sentence?

My teacher doesn't approve of the first example that I have listed.

My teacher doesn't approve the first example that I have listed.

Stretching the answer of Deadrat little further:

For Op's given examples:

My teacher doesn't approve of the first example that I have listed.

Means:

The teacher does not agree with the first example.

While

My teacher doesn't approve the first example that I have listed.

Means

The teacher doesn't accept the example.

Approve has the meaning of agreement, but with the preposition, it means agree with:

I approved of your decision.

Without the preposition, it means agree to:

The executives committee approved your budget.