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README.md

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|144|[Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/)|[Solution](../master/src/main/java/com/stevesun/solutions/BinaryTreePreorderTraversal.java)| O(n)|O(h) | Medium| Binary Tree
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|143|[Reorder List](https://leetcode.com/problems/reorder-list/)|[Solution](../master/src/main/java/com/stevesun/solutions/ReorderList.java)| O(n)|O(1) | Medium|
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|142|[Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/)|[Solution](../master/src/main/java/com/stevesun/solutions/LinkedListCycleII.java)| O(n)|O(1) | Medium| Linked List
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|141|[Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/)|[Solution](../master/src/main/java/com/stevesun/solutions/LinkedListCycle.java)| O(n)|O(1) | Easy| Linked List
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|141|[Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/)|[Solution](../master/src/main/java/com/stevesun/solutions/_141.java)| O(n)|O(1) | Easy| Linked List
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|140|[Word Break II](https://leetcode.com/problems/word-break-ii/)|[Solution](../master/src/main/java/com/stevesun/solutions/WordBreakII.java)| ? |O(n^2) | Hard| Backtracking/DFS
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|139|[Word Break](https://leetcode.com/problems/word-break/)|[Solution](../master/src/main/java/com/stevesun/solutions/WordBreak.java)| O(n^2)|O(n) | Medium| DP
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|138|[Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/)|[Solution](../master/src/main/java/com/stevesun/solutions/_138.java)| O(n)|O(n) | Medium| LinkedList, HashMap

src/main/java/com/stevesun/solutions/LinkedListCycle.java renamed to src/main/java/com/stevesun/solutions/_141.java

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Can you solve it without using extra space?
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*
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*/
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public class LinkedListCycle {
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public class _141 {
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public boolean hasCycle(ListNode head) {
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ListNode slow = head, fast = head;

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