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127 | 127 | ## Backtrack Medium |
128 | 128 | | # | Title | Solution | Time | Space | Video| |
129 | 129 | | --- | ----- | -------- | ---- | ----- | ---- | |
130 | | -|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)| |
131 | | -|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)| |
132 | | -|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)| |
133 | | -|47|[Permutations II](https://leetcode.com/problems/permutations/#/description)| [Python ](./backtrack/Yu/47.py) | _O(N*(N!))_| _O(N!)_ | |[:tv:](https://youtu.be/imLl2s9Ujis)| |
134 | | -|60|[Permutation Sequence](https://leetcode.com/problems/permutation-sequence/#/description)| [Python ](./backtrack/Yu/60.py) | _O(N * (N!)_| _O(N)_ ||| |
135 | | -|77|[Combinations](https://leetcode.com/problems/combinations/#/description)| [Python ](./backtrack/Yu/77.py) | _O(N*(N!))_| _O(N!)_ | || |
136 | | -|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)| |
137 | | -|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)| |
138 | | -|216|[Combination Sum III](https://leetcode.com/problems/combination-sum-iii/#/description)| [Python ](./backtrack/Yu/216.py) | _O(K * (2^N)_| _O(N)_ ||| |
| 130 | +|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)| |
| 131 | +|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)| |
| 132 | +|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)| |
| 133 | +|47|[Permutations II](https://leetcode.com/problems/permutations/#/description)| [Python ](./backtrack/Yu/47.py) | _O(N*(N!))_| _O(N!)_ | [:tv:](https://youtu.be/imLl2s9Ujis)| |
| 134 | +|60|[Permutation Sequence](https://leetcode.com/problems/permutation-sequence/#/description)| [Python ](./backtrack/Yu/60.py) | _O(N * (N!)_| _O(N)_ || |
| 135 | +|77|[Combinations](https://leetcode.com/problems/combinations/#/description)| [Python ](./backtrack/Yu/77.py) | _O(N*(N!))_| _O(N!)_ || |
| 136 | +|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)| |
| 137 | +|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)| |
| 138 | +|216|[Combination Sum III](https://leetcode.com/problems/combination-sum-iii/#/description)| [Python ](./backtrack/Yu/216.py) | _O(K * (2^N)_| _O(N)_ || |
139 | 139 |
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140 | 140 | ## Greedy Medium |
141 | 141 | | # | Title | Solution | Time | Space | Video| |
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