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‎README.md

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* [Linked List](https://github.com/yuzhoujr/LeetCode#linked-list)
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## Linked List
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[Overview](http://www.cnblogs.com/Raising-Sun/p/5970662.html#3534606)
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## Array Medium
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| # | Title | Solution | Time | Space | Video|
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| --- | ----- | -------- | ---- | ----- | ---- |
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|3| [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/#/solutions) | [Python](./array/3.py) | _O(n)_| _O(n)_ ||
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|463| [Island Perimeter](https://leetcode.com/problems/island-perimeter/#/description) | [Python](./array/463.py) | _O(n^2)_| _O(1)_||
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## Linked List
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[Overview](http://www.cnblogs.com/Raising-Sun/p/5970662.html#3534606)
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## Linked List Easy
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| # | Title | Solution | Time | Space | Video|
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| --- | ----- | -------- | ---- | ----- | ---- |
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|21|[Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists) | [Python](./linkedlist/MergeTwoSortedLists.py) | _O(n)_| _O(n)_ ||
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| 89 |[Partition List](https://leetcode.com/problems/partition-list/) | [Python](./linkedlist/PartitionLinkedList.py) | _O(n)_ | _O(n)_ ||
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|141|[Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/#/description) | [Python](./linkedlist/LinkedListCycle.py) | _O(n)_ | _O(1)_ ||
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|21|[Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists) | [Python](./linkedlist/MergeTwoSortedLists.py) | _O(n)_| _O(n)_ ||
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|89|[Partition List](https://leetcode.com/problems/partition-list/) | [Python](./linkedlist/PartitionLinkedList.py) | _O(n)_ | _O(n)_ ||
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|141|[Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/#/description) | [Python](./linkedlist/LinkedListCycle.py) | _O(n)_ | _O(1)_ ||
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|160|[Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists) | [Python](./linkedlist/IntersectionOfTwoLinkedLists.py) | _O(n)_| _O(1)_ ||
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|203|[Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements/#/description) | [Python](./linkedlist/RemoveLinkedListElements.py) | _O(n)_| _O(1)_ ||
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|206|[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/#/description) | [Python](./linkedlist/ReverseLinkedList.py) | _O(n)_| _O(1)_ || Tutorial](https://www.youtube.com/watch?v=sYcOK51hl-A&t=681s) |
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|234|[Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list/) | [Python](./linkedlist/palindrome.py) | _O(n)_| _O(1)_ ||
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|83|[Remove Duplicates from Sorted List](https://leetcode.com/problems/remove-duplicates-from-sorted-list/#/description)| [Python](./linkedlist/deleteDuplicates.py) | _O(n)_| _O(1)_ ||
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## LinkedList Medium
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| # | Title | Solution | Time | Space | Difficulty |Tag| Note|
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|-----|-------| -------- | ---- | ------|------------|---|-----|
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|2|[Add Two Numbers](https://leetcode.com/problems/add-two-numbers/#/description) | [Python](./linkedlist/addTwoNumbers.py) | _O(n)_| _O(n)_| Medium |CC189||
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|445| [Add Two Numbers II](https://leetcode.com/problems/add-two-numbers-ii/#/description)| [Python](./linkedlist/addTwoNumbersTwo.py) | _O(n)_| _O(n)_| Medium |CC189 |Stack|
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|142|[Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/#/description)| [Python](./linkedlist/detectCycleii.py) | _O(n)_| _O(1)_| Medium |CC189 |[Video](https://www.youtube.com/watch?v=iZVBVCpmugI&t=1s)|
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|328|[Odd Even Linked List](https://leetcode.com/problems/odd-even-linked-list/#/description)| [Python](./linkedlist/oddEvenList.py) | _O(n)_| _O(1)_| Medium |||
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|143|[Reorder List](https://leetcode.com/problems/reorder-list/#/description)| [Python](./linkedlist/reorder.py) | _O(n)_| _O(1)_| Medium |||
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|24|[Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/#/solutions)| [Python](./linkedlist/swapPairs.py) | _O(n)_| _O(1)_| Medium ||[Note](http://imgur.com/a/4G6ng)|
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|148|[Sort List](https://leetcode.com/problems/sort-list/#/description)| [Python](./linkedlist/sortList.py) | _O(nlogn)_| _O(1)_| Medium |||
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|61|[Rotate List](https://leetcode.com/problems/rotate-list/#/description)| [Python](./linkedlist/rotateRight.py) | _O(n)_| _O(1)_| Medium |||
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|19|[Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/#/description)| [Python](./linkedlist/removeNthFromEnd.py) | _O(n)_| _O(1)_| Medium |||
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|138|[Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/#/description)| [Python](./linkedlist/copyRandomList.py) | _O(n)_| _O(n)_| Medium |||
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| # | Title | Solution | Time | Space | Video|
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|---|-----| -------- | ---- | -----|----|
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|2|[Add Two Numbers](https://leetcode.com/problems/add-two-numbers/#/description) | [Python](./linkedlist/addTwoNumbers.py) | _O(n)_| _O(n)_|
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|445| [Add Two Numbers II](https://leetcode.com/problems/add-two-numbers-ii/#/description)| [Python](./linkedlist/addTwoNumbersTwo.py) | _O(n)_| _O(n)_|
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|142|[Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/#/description)| [Python](./linkedlist/detectCycleii.py) | _O(n)_| _O(1)_|[:tv:](https://www.youtube.com/watch?v=iZVBVCpmugI&t=1s)|
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|328|[Odd Even Linked List](https://leetcode.com/problems/odd-even-linked-list/#/description)| [Python](./linkedlist/oddEvenList.py) | _O(n)_| _O(1)_|
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|143|[Reorder List](https://leetcode.com/problems/reorder-list/#/description)| [Python](./linkedlist/reorder.py) | _O(n)_| _O(1)_|
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|24|[Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/#/solutions)| [Python](./linkedlist/swapPairs.py) | _O(n)_| _O(1)_|
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|148|[Sort List](https://leetcode.com/problems/sort-list/#/description)| [Python](./linkedlist/sortList.py) | _O(nlogn)_| _O(1)_|
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|61|[Rotate List](https://leetcode.com/problems/rotate-list/#/description)| [Python](./linkedlist/rotateRight.py) | _O(n)_| _O(1)_|
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|19|[Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/#/description)| [Python](./linkedlist/removeNthFromEnd.py) | _O(n)_| _O(1)_|
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|138|[Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/#/description)| [Python](./linkedlist/copyRandomList.py) | _O(n)_| _O(n)_|
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## Stacks Easy
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| # | Title | Solution | Time | Space | Difficulty |Tag| Note|
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| # | Title | Solution | Time | Space | Video|
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|---|-----| -------- | ---- | -----|----|
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|155|[Min Stack](https://leetcode.com/problems/min-stack/#/description)| [Python](./stack_queue/minStack.py) | _O(1)_| _O(n)_ | Easy | ||
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|225|[Implement Stack using Queues](https://leetcode.com/problems/implement-stack-using-queues/#/description)| [Python](./stack_queue/queueStack.py) | push/pop: _O(1)_ top:_O(n)_ | _O(n)_ | Easy | ||
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|20|[Valid Parentheses](https://leetcode.com/problems/valid-parentheses/#/description)| [Python](./stack_queue/isValid.py) | _O(n)_| _O(n)_ | Easy | ||
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|346|[Moving Average from Data Stream](https://leetcode.com/problems/moving-average-from-data-stream/#/description)| [Python](./stack_queue/movingAverage.py) | _O(1)_| _O(n)_ | Easy | ||
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## Tree Easy
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|110|[Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/#/description)| [Python [Yu]](./tree/Yu/110_isBalanced.py) | _O(N)_| _O(h)_ | Easy | ||
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|112|[Path Sum](https://leetcode.com/problems/path-sum/#/description)| [Python [Yu]](./tree/Yu/112_hasPathSum.py) | _O(N)_| _O(h)_ | Easy | |[中文讲解](https://www.youtube.com/watch?v=LgtcGjIuE18&feature=youtu.be)|
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|100|[Same Tree](https://leetcode.com/problems/same-tree/)| [Python [Yu]](./tree/Yu/100_isSameTree.py) | _O(N)_| _O(1)_ | Easy |||
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## Tree Medium
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|144|[Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/#/description)| [Python [Yu]](./tree/Yu/144.py) | _O(N)_| _O(N)_ | Medium | |[:tv:](https://youtu.be/cHbdPonjYS0)|
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|102|[Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/#/description)| [Python [Yu]](./tree/Yu/102.py) | _O(N)_| _O(N)_ | Medium | |[:tv:](https://youtu.be/IWiprpdSgzg)|
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|107|[Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/#/description)| [Python [Yu]](./tree/Yu/107.py) | _O(N)_| _O(N)_ | Medium | ||
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## Backtrack Medium
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|78|[Subsets](https://leetcode.com/problems/subsets/#/description)| [Python [Yu]](./backtrack/Yu/78.py) | _O(N*(2^N))_| _O(2^N)_ | Medium | |[:tv:](https://youtu.be/Az3PfUep7gk)|
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|90|[Subsets II](https://leetcode.com/problems/subsets-ii/#/description)| [Python [Yu]](./backtrack/Yu/90.py) | _O(N*(2^N))_| _O(2^N)_ | Medium | |[:tv:](https://youtu.be/Az3PfUep7gk)|
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|46|[Permutations](https://leetcode.com/problems/permutations/#/description)| [Python [Yu]](./backtrack/Yu/46.py) | _O(N*(N!))_| _O(N!)_ | Medium | |[:tv:](https://www.youtube.com/watch?v=oCGMwvKUQ_I&feature=youtu.be)|
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|216|[Combination Sum III](https://leetcode.com/problems/combination-sum-iii/#/description)| [Python [Yu]](./backtrack/Yu/216.py) | _O(K * (2^N)_| _O(N)_ | Medium | ||
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## Greedy Medium
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|452|[Minimum Number of Arrows to Burst Balloons](https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/#/description)| [Python [Yu]](./greedy/452.py) | _O(N)_| _O(1)_ | Medium| |
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## Dynamic Programming Easy
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|70|[Climbing Stairs](https://leetcode.com/problems/climbing-stairs/#/solutions)| [Python [Yu]](./dp/70.py) | _O(N)_| _O(1)_ | Easy| |
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|53|[Maximum Subarray](https://leetcode.com/problems/maximum-subarray/#/description)| [Python [Yu]](./dp/53.py) | _O(N)_| _O(N)_ | Easy|[:tv:](https://youtu.be/4tfhDdgu76E) |
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|198|[House Robber](https://leetcode.com/problems/house-robber/#/description)| [Python [Yu]](./dp/198.py) | _O(N)_| _O(N)_ | Easy|[:tv:](https://youtu.be/QSjPkgyxCaQ) |
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## Dynamic Programming Medium
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|64|[Minimum Path Sum](https://leetcode.com/problems/minimum-path-sum/#/submissions/1)| [Python [Yu]](./dp/64.py) | _O(N^2)_| _O(M*N)_ | Medium| [:tv:](https://youtu.be/bEcW6QqgXvM)|
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|62|[Unique Paths](https://leetcode.com/problems/unique-paths/#/description)| [Python [Yu]](./dp/62.py) | _O(N^2)_| _O(M*N)_ | Medium| Reference #64|
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|55|[Jump Game](https://leetcode.com/problems/jump-game/)| [Python [Yu]](./dp/55.py) | _O(N^2)_| _O(1)_ | Medium| TLE with DP/Use Greedy for O(N) Solution|

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