Update README.md

kamyu104 · kamyu104 · commit 332d6d19a23f · 2015-10-03T14:36:56.000+08:00
diff --git a/README.md b/README.md
@@ -363,7 +363,7 @@ Shell
 133| [Clone Graph](https://leetcode.com/problems/clone-graph/)| [Python](./Python/clone-graph.py)   | _O(n)_          | _O(n)_          | Medium         ||
 207| [Course Schedule](https://leetcode.com/problems/course-schedule/)| [Python](./Python/course-schedule.py)   | _O(\|V\| + \|E\|)_          | _O(\|E\|)_          | Medium         || Topological Sort |
 210| [Course Schedule II](https://leetcode.com/problems/course-schedule-ii/)| [Python](./Python/course-schedule-ii.py)   | _O(\|V\| + \|E\|)_          | _O(\|E\|)_          | Medium         || Topological Sort |
-261| [Graph Valid Tree](https://leetcode.com/problems/graph-valid-tree/)| [C++](./C++/graph-valid-tree.cpp) [Python](./Python/graph-valid-tree.py)   | _O(\|V\| + \|E\|)_          | _O(\|V\|)_          | Medium         | 📖 |
+261| [Graph Valid Tree](https://leetcode.com/problems/graph-valid-tree/)| [C++](./C++/graph-valid-tree.cpp) [Python](./Python/graph-valid-tree.py)   | _O(\|V\| + \|E\|)_          | _O(\|V\| + \|E\|)_          | Medium         | 📖 |
 269| [Alien Dictionary](https://leetcode.com/problems/alien-dictionary/) | [C++](./C++/alien-dictionary.cpp)  [Python](./Python/alien-dictionary.py)  | _O(n)_ | _O(1)_ | Hard         |📖| Topological Sort, BFS, DFS |
 286| [Walls and Gates](https://leetcode.com/problems/walls-and-gates/)| [C++](./C++/walls-and-gates.cpp) [Python](./Python/walls-and-gates.py)   | _O(m * n)_          | _O(g)_          | Medium         | 📖 |
 
