Update 0001-1000.md

Author: kamyu104

0001-1000.md

@@ -587,7 +587,7 @@
 0012 | [Integer to Roman](https://leetcode.com/problems/integer-to-roman/) | [C++](./C++/integer-to-roman.cpp) [Python](./Python/integer-to-roman.py) | _O(n)_ | _O(1)_          | Medium         ||
 0013 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [C++](./C++/roman-to-integer.cpp) [Python](./Python/roman-to-integer.py) | _O(n)_ | _O(1)_          | Easy           ||
 0029 | [Divide Two Integers](https://leetcode.com/problems/divide-two-integers/) | [C++](./C++/divide-two-integers.cpp) [Python](./Python/divide-two-integers.py)    | _O(1)_       | _O(1)_         | Medium         ||
-0050 | [Pow(x, n)](https://leetcode.com/problems/powx-n/)     | [C++](./C++/powx-n.cpp) [Python](./Python/powx-n.py)     | _O(1)_       | _O(1)_       | Medium         ||
+0050 | [Pow(x, n)](https://leetcode.com/problems/powx-n/)     | [C++](./C++/powx-n.cpp) [Python](./Python/powx-n.py)     | _O(logn)_       | _O(1)_       | Medium         ||
 0060 | [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/) | [C++](./C++/permutation-sequence.cpp) [Python](./Python/permutation-sequence.py) | _O(n^2)_ | _O(n)_  | Medium         || `Cantor Ordering`
 0065 | [Valid Number](https://leetcode.com/problems/valid-number/) | [C++](./C++/valid-number.cpp) [Python](./Python/valid-number.py) | _O(n)_         | _O(1)_          | Hard           || `Automata`
 0089 | [Gray Code](https://leetcode.com/problems/gray-code/)     | [C++](./C++/gray-code.cpp) [Python](./Python/gray-code.py)  | _O(2^n)_        | _O(1)_          | Medium         ||