Update README.md

Author: kamyu104

README.md

@@ -392,7 +392,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
   #  | Problem         |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note
 -----|---------------- | --------------- | --------------- | --------------- | ------------- |--------------| -----
 126| [Word Ladder II](https://leetcode.com/problems/word-ladder-ii/)   |[Python](./Python/word-ladder-ii.py) | _O(n * d)_ | _O(d)_         | Hard         ||
-294| [Flip Game II](https://leetcode.com/problems/flip-game-ii/) | [C++](./C++/flip-game-ii.cpp) [Python](./Python/flip-game-ii.py)  | _O(n^2)_ | _O(n)_ | Medium         |📖| DP, Hash |
+294| [Flip Game II](https://leetcode.com/problems/flip-game-ii/) | [C++](./C++/flip-game-ii.cpp) [Python](./Python/flip-game-ii.py)  | _O(n + c^2)_ | _O(c)_ | Medium         |📖| DP, Hash |
 
 ## Greedy
   #  | Problem         |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note