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100 | 100 | | # | Title | Solution | Time | Space | Video| |
101 | 101 | | --- | ----- | -------- | ---- | ----- | ---- | |
102 | 102 | |110|[Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/#/description)| [Python ](./tree/Yu/110_isBalanced.py) | _O(N)_| _O(h)_ | |
103 | | -|107|[Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/)| [Python ](./tree/Yu/107.py) | _O(N)_| _O(h)_ | |
104 | 103 | |112|[Path Sum](https://leetcode.com/problems/path-sum/#/description)| [Python ](./tree/Yu/112_hasPathSum.py) | _O(N)_| _O(h)_ |[:tv:](https://www.youtube.com/watch?v=LgtcGjIuE18&feature=youtu.be)| |
105 | 104 | |100|[Same Tree](https://leetcode.com/problems/same-tree/)| [Python ](./tree/Yu/100_isSameTree.py) | _O(N)_| _O(1)_| |
106 | 105 | |101|[Symmetric Tree](https://leetcode.com/problems/symmetric-tree/#/description)| [Python ](./tree/Yu/101_symmetricTree.py)| _O(N)_| _O(1)_|[:tv:](https://youtu.be/3Gl4F29LVpQ)| |
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138 | 137 | | # | Title | Solution | Time | Space | Video| |
139 | 138 | | --- | ----- | -------- | ---- | ----- | ---- | |
140 | 139 | |78|[Subsets](https://leetcode.com/problems/subsets/#/description)| [Python ](./backtrack/Yu/78.py) | _O(N*(2^N))_| _O(2^N)_|[:tv:](https://youtu.be/Az3PfUep7gk)| |
141 | | -|90|[Subsets II](https://leetcode.com/problems/subsets-ii/#/description)| [Python ](./backtrack/Yu/90.py) | _O(N*(2^N))_| _O(2^N)_ |[:tv:](https://youtu.be/Az3PfUep7gk)| |
142 | | -|46|[Permutations](https://leetcode.com/problems/permutations/#/description)| [Python ](./backtrack/Yu/46.py) | _O(N*(N!))_| _O(N!)_ | [:tv:](https://www.youtube.com/watch?v=oCGMwvKUQ_I&feature=youtu.be)| |
143 | | -|47|[Permutations II](https://leetcode.com/problems/permutations/#/description)| [Python ](./backtrack/Yu/47.py) | _O(N*(N!))_| _O(N!)_ | [:tv:](https://youtu.be/imLl2s9Ujis)| |
| 140 | +|90|[Subsets II](https://leetcode.com/problems/subsets-ii/#/description)| [Python ](./backtrack/Yu/90.py) | _O(N*(2^N))_| _O(2^N)_ || |
| 141 | +|46|[Permutations](https://leetcode.com/problems/permutations/#/description)| [Python ](./backtrack/Yu/46.py) | _O(N*(N!))_| _O(N!)_ | [:tv:](https://youtu.be/oCGMwvKUQ_I)| |
| 142 | +|47|[Permutations II](https://leetcode.com/problems/permutations-ii/#/description)| [Python ](./backtrack/Yu/47.py) | _O(N*(N!))_| _O(N!)_ | [:tv:](https://youtu.be/imLl2s9Ujis)| |
144 | 143 | |60|[Permutation Sequence](https://leetcode.com/problems/permutation-sequence/#/description)| [Python ](./backtrack/Yu/60.py) | _O(N * (N!)_| _O(N)_ || |
145 | 144 | |77|[Combinations](https://leetcode.com/problems/combinations/#/description)| [Python ](./backtrack/Yu/77.py) | _O(N*(N!))_| _O(N!)_ || |
146 | 145 | |39|[Combination Sum](https://leetcode.com/problems/combination-sum/#/description)| [Python ](./backtrack/Yu/39.py) | _O(K * (2^N)_| _O(N)_ | [:tv:](https://youtu.be/HdS5dOaz-mk)| |
147 | | -|40|[Combination Sum II](https://leetcode.com/problems/combination-sum-ii/#/solutions)| [Python ](./backtrack/Yu/39.py) | _O(K * (2^N)_| _O(N)_ |[:tv:](https://youtu.be/HdS5dOaz-mk)| |
| 146 | +|40|[Combination Sum II](https://leetcode.com/problems/combination-sum-ii/#/solutions)| [Python ](./backtrack/Yu/39.py) | _O(K * (2^N)_| _O(N)_ || |
148 | 147 | |216|[Combination Sum III](https://leetcode.com/problems/combination-sum-iii/#/description)| [Python ](./backtrack/Yu/216.py) | _O(K * (2^N)_| _O(N)_ || |
149 | 148 | |17|[Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/)| [Python ](./backtrack/Yu/17.py) | _O(N*(4^N))_| _O(N)_ | [:tv:](https://www.youtube.com/watch?v=7KZWLM9QtRA)| |
150 | 149 | |131|[Palindrome Partitioning](https://leetcode.com/problems/palindrome-partitioning/description/)| [Python ](./backtrack/Yu/131.py) | _O(N*(2^N))_| _O(N)_ | [:tv:](https://youtu.be/UFdSC_ml4TQ)| |
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