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136 | 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 | 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 | 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 | +|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)| |
| 140 | + |
139 | 141 |
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140 | 142 | ## Greedy Medium |
141 | 143 | | # | Title | Solution | Time | Space | Video| |
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