LinkedList各種操作

public boolean ispalindrome(listnode head)

listnode mid = findmiddle(head);
listnode sec = reverse(mid.next);
while(head != null && sec != null && head.val == sec.val)
return sec == null;
}

1、linkedlist節點結構

listnode

public class listnode

}

2、查詢中間節點方法

private listnode findmiddle(listnode head) 

return slow;
}

3. merge合併操作

public listnode merge(listnode head1,listnode head2)else

ite = ite.next;
} if(head1 != null)else
return dummy.next;
}

4、liskedlist的排序方法1

public listnode sortlist(listnode head)

listnode mid = findmiddle(head);
listnode right = sortlist(mid.next);
mid.next = null;
listnode left = sortlist(head);
return merge(left,right);
}

5、找到尾節點

public listnode gettail(listnode head)

while (head.next != null)
return head;
}

public listnode concat(listnode left,listnode middle,listnode right)

7、linkedlist排序方法2 快速排序

public listnode sortlist_quicksort(listnode head)

listnode mid = findmiddle(head);
listnode leftdummy = new listnode(0),lefttail = leftdummy;
listnode middledummy = new listnode(0),middletail = middledummy;
listnode rightdummy = new listnode(0), righttail = rightdummy;
while (head != null)else if(head.val > mid.val)else
head = head.next;
} lefttail.next = null;
righttail.next = null;
middletail.next = null;
listnode left = sortlist_quicksort(leftdummy.next);
listnode right = sortlist_quicksort(rightdummy.next);
return concat(left, middledummy.next,right);
}

private listnode reverse(listnode head) 

return newhead;
}

9、判斷lingkedlist是否有環

public boolean hascycle(listnode head)else

head = head.next;
} return false;
}

10.刪除給定節點

public void deletenode(listnode node)

11.判斷是否為回文

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