Correctly traverse the method of deleting elements in the list (recommended)

There are many ways to traverse and delete the elements in the list, which will cause problems when used improperly. Let's mainly look at the following forms of traversing and deleting elements in the list:

1. Delete multiple qualified elements through the enhanced for loop

2. Delete a qualified element through the enhanced for loop

3. Delete multiple qualified elements through normal for deletion

4. Traverse through iterator and delete multiple elements that meet the conditions

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