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74 | 74 | |24|[Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/#/solutions)| [Python](./linkedlist/swapPairs.py) | _O(n)_| _O(1)_| |
75 | 75 | |148|[Sort List](https://leetcode.com/problems/sort-list/#/description)| [Python](./linkedlist/sortList.py) | _O(nlogn)_| _O(1)_| |
76 | 76 | |61|[Rotate List](https://leetcode.com/problems/rotate-list/#/description)| [Python](./linkedlist/rotateRight.py) | _O(n)_| _O(1)_| |
77 | | -|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)_| |
| 77 | +|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)_|[:tv:](https://youtu.be/8Jq8ikIeF1M)| |
78 | 78 | |138|[Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/#/description)| [Python](./linkedlist/copyRandomList.py) | _O(n)_| _O(n)_| |
79 | 79 |
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80 | 80 |
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162 | 162 | |45|[Jump Game II](https://leetcode.com/problems/jump-game-ii/#/description)| [Python ](./dp/55.py) | _O(N^2)_| _O(1)_ | TLE with DP/Use Greedy for O(N) Solution | |
163 | 163 | |300|[Longest Increasing Subsequence](https://leetcode.com/problems/longest-increasing-subsequence/#/description)| [Python ](./dp/300.py) | _O(N^2)_| _O(1)_ | Use Binary-Search for NlogN Solution| |
164 | 164 |
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165 | | - |
| 165 | +## BitMap Easy |
| 166 | +|136|[Single Number](https://leetcode.com/problems/single-number/description/)| [Python ](./bitmap/136.py) | _O(N)_| _O(1)_ | [:tv:](https://www.youtube.com/watch?v=C4GWPpNivfI&list=PLFp7f5kTehDlpCj5puB3WGbH1Qi3eSDat&index=6&t=7s)| |
166 | 167 |
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167 | 168 |
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168 | 169 | #### License |
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