msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

add q138

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pull/6/head
yuanguangxin 5 years ago
parent 594c2795ac
commit d4dc36a4c9
6 changed files with 121 additions and 16 deletions
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42
.idea/workspace.xml
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@ -2,8 +2,11 @@
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@ -66,11 +69,11 @@
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<recent name="树的遍历.q102_二叉树的层次遍历" />
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@ -637,7 +646,8 @@
<MESSAGE value="增加JVM相关问题" />
<MESSAGE value="add q141/q202/q258" />
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1
README.md
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@ -10,6 +10,7 @@
* [q2_两数相加](/src/链表操作/q2_两数相加)
* [q206_反转链表](/src/链表操作/q206_反转链表)
* [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)
### 双指针遍历/滑动窗口

13
src/链表操作/q138_复制带随机指针的链表/f1/Node.java
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@ -0,0 +1,13 @@
package 链表操作.q138_复制带随机指针的链表.f1;
class Node {
int val;
Node next;
Node random;
public Node(int val) {
this.val = val;
this.next = null;
this.random = null;
}
}

29
src/链表操作/q138_复制带随机指针的链表/f1/Solution.java
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@ -0,0 +1,29 @@
package 链表操作.q138_复制带随机指针的链表.f1;
import java.util.HashMap;
/**
* 用Map存储遍历过的节点，时间o(n)，额外空间o(n)
*/
public class Solution {
HashMap<Node, Node> visitedHash = new HashMap<Node, Node>();
public Node copyRandomList(Node head) {
if (head == null) {
return null;
}
if (this.visitedHash.containsKey(head)) {
return this.visitedHash.get(head);
}
Node node = new Node(head.val);
this.visitedHash.put(head, node);
node.next = this.copyRandomList(head.next);
node.random = this.copyRandomList(head.random);
return node;
}
}

13
src/链表操作/q138_复制带随机指针的链表/f2/Node.java
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@ -0,0 +1,13 @@
package 链表操作.q138_复制带随机指针的链表.f2;
class Node {
int val;
Node next;
Node random;
public Node(int val) {
this.val = val;
this.next = null;
this.random = null;
}
}

39
src/链表操作/q138_复制带随机指针的链表/f2/Solution.java
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@ -0,0 +1,39 @@
package 链表操作.q138_复制带随机指针的链表.f2;
/**
* 在每一个链表的节点后都新连一个节点之后操作 时间o(n) 额外空间o(1)
*/
public class Solution {
public Node copyRandomList(Node head) {
if (head == null) {
return null;
}
Node ptr = head;
while (ptr != null) {
Node newNode = new Node(ptr.val);
newNode.next = ptr.next;
ptr.next = newNode;
ptr = newNode.next;
}
ptr = head;
while (ptr != null) {
ptr.next.random = (ptr.random != null) ? ptr.random.next : null;
ptr = ptr.next.next;
}
Node ptrOldList = head;
Node ptrNewList = head.next;
Node headOld = head.next;
while (ptrOldList != null) {
ptrOldList.next = ptrOldList.next.next;
ptrNewList.next = (ptrNewList.next != null) ? ptrNewList.next.next : null;
ptrOldList = ptrOldList.next;
ptrNewList = ptrNewList.next;
}
return headOld;
}
}
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