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反转链表
题目形容
输出一个链表,反转链表后,输入新链表的表头。
题目链接 : 反转链表
代码
/**
* 题目:反转链表
* 题目形容
* 输出一个链表,反转链表后,输入新链表的表头。* 题目链接:* https://www.nowcoder.com/practice/75e878df47f24fdc9dc3e400ec6058ca?tpId=13&&tqId=11168&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking
*/
public class Jz15 {public ListNode reverseList(ListNode head) {if (head == null || head.next == null) {return head;}
ListNode first = head, second = head.next;
first.next = null;
while (first != null && second != null) {
ListNode temp = first;
first = second;
second = second.next;
first.next = temp;
}
return first;
}
public static void main(String[] args) {ListNode head = new ListNode(1);
head.next = new ListNode(2);
head.next.next = new ListNode(3);
System.out.println("before reverse");
ListNode cur = head;
while (cur != null) {System.out.print(cur.val + " ");
cur = cur.next;
}
System.out.println();
Jz15 jz15 = new Jz15();
ListNode result = jz15.reverseList(head);
System.out.println("after reverse");
ListNode cur1 = result;
while (cur1 != null) {System.out.print(cur1.val + " ");
cur1 = cur1.next;
}
}
}
【每日寄语】生存的实质就是幸福的活着,而生存的智慧就是活出本人想要的样子。
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