msb-public-java
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LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
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Code Issues Projects Releases Wiki Activity

add q19

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pull/6/head
yuanguangxin 4 years ago
parent 2b1138c66f
commit 962f808cf9
4 changed files with 57 additions and 19 deletions
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38
.idea/workspace.xml
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@ -2,9 +2,8 @@
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<recent name="快慢指针遍历.q876_链表的中间结点" />
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1
README.md
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@ -9,6 +9,7 @@
### 链表操作
* [q2_两数相加](/src/链表操作/q2_两数相加)
* [q19_删除链表的倒数第N个节点](/src/链表操作/q19_删除链表的倒数第N个节点)
* [q138_复制带随机指针的链表](/src/链表操作/q138_复制带随机指针的链表)
* [q206_反转链表](/src/链表操作/q206_反转链表)

12
src/链表操作/q19_删除链表的倒数第N个节点/ListNode.java
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@ -0,0 +1,12 @@
package 链表操作.q19_删除链表的倒数第N个节点;
public class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
}
}

25
src/链表操作/q19_删除链表的倒数第N个节点/Solution.java
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@ -0,0 +1,25 @@
package 链表操作.q19_删除链表的倒数第N个节点;
/**
* 利用两个指针 o(n)
*/
public class Solution {
public ListNode removeNthFromEnd(ListNode head, int n) {
ListNode dummy = new ListNode(0);
dummy.next = head;
ListNode first = dummy;
ListNode second = dummy;
for (int i = 1; i <= n + 1; i++) {
first = first.next;
}
while (first != null) {
first = first.next;
second = second.next;
}
second.next = second.next.next;
return dummy.next;
}
}
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