関連ワード:  delete node in singly linked list    delete node in singly linked list python    delete node in singly linked list java    delete node in singly linked list leetcode    delete node in singly linked list c++    delete a node in singly linked list gfg practice    delete last node in singly linked list    delete first node in singly linked list    delete middle node in singly linked list    delete a node in singly linked list gfg