update readme

Author: hogan-tech

.github/Question List.txt

@@ -1,2 +1,3 @@
 0263-ugly-number python easy
-0264-ugly-number-ii python medium
+0264-ugly-number-ii python medium
+0650-2-keys-keyboard python medium

README.md

@@ -279,6 +279,7 @@ The solutions are organized as follows:
 | 0646 | [Maximum Length of Pair Chain](https://leetcode.com/problems/maximum-length-of-pair-chain/)                                                                                               | [Python](./0646-maximum-length-of-pair-chain/0646-maximum-length-of-pair-chain.py)                                                                                                                                                                                             | [Medium](./0646-maximum-length-of-pair-chain/README.md)                                                |
 | 0647 | [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/)                                                                                                           | [Python](./0647-palindromic-substrings/0647-palindromic-substrings.py)                                                                                                                                                                                                         | [Medium](./0647-palindromic-substrings/README.md)                                                      |
 | 0648 | [Replace Words](https://leetcode.com/problems/replace-words/)                                                                                                                             | [Python](./0648-replace-words/0648-replace-words.py)                                                                                                                                                                                                                           | [Medium](./0648-replace-words/README.md)                                                               |
+| 0650 | [2 Keys Keyboard](https://leetcode.com/problems/2-keys-keyboard/)                                                                                                                         | [Python](./0650-2-keys-keyboard/0650-2-keys-keyboard.py)                                                                                                                                                                                                                       | [Medium](./0650-2-keys-keyboard/README.md)                                                             |
 | 0653 | [Two Sum IV - Input is a BST](https://leetcode.com/problems/two-sum-iv-input-is-a-bst/)                                                                                                   | [C++](./0653-two-sum-iv-input-is-a-bst/0653-two-sum-iv-input-is-a-bst.cpp)                                                                                                                                                                                                     | [Easy](./0653-two-sum-iv-input-is-a-bst/README.md)                                                     |
 | 0658 | [Find K Closest Elements](https://leetcode.com/problems/find-k-closest-elements/)                                                                                                         | [Python](./0658-find-k-closest-elements/0658-find-k-closest-elements.py)                                                                                                                                                                                                       | [Medium](./0658-find-k-closest-elements/README.md)                                                     |
 | 0661 | [Image Smoother](https://leetcode.com/problems/image-smoother/)                                                                                                                           | [Python](./0661-image-smoother/0661-image-smoother.py)                                                                                                                                                                                                                         | [Easy](./0661-image-smoother/README.md)                                                                |