Fix Steiner tree complexity formatting in README: replace _ with ·

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: williamfiset

README.md

@@ -219,7 +219,7 @@ $ java -cp classes com.williamfiset.algorithms.search.BinarySearch
 - [Kosaraju's strongly connected components algorithm (adjacency list)](src/main/java/com/williamfiset/algorithms/graphtheory/Kosaraju.java) **- O(V+E)**
 - [:movie_camera:](https://www.youtube.com/watch?v=jsmMtJpPnhU) [Prim's min spanning tree algorithm (lazy version, adjacency list)](src/main/java/com/williamfiset/algorithms/graphtheory/LazyPrimsAdjacencyList.java) **- O(Elog(E))**
 - [:movie_camera:](https://www.youtube.com/watch?v=xq3ABa-px_g) [Prim's min spanning tree algorithm (eager version, adjacency list)](src/main/java/com/williamfiset/algorithms/graphtheory/EagerPrimsAdjacencyList.java) **- O(Elog(V))**
-- [Steiner tree (minimum spanning tree generalization)](src/main/java/com/williamfiset/algorithms/graphtheory/SteinerTree.java) **- O(V<sup>3</sup> + V<sup>2</sup> _ 2<sup>T</sup> + V _ 3<sup>T</sup>)**
+- [Steiner tree (minimum spanning tree generalization)](src/main/java/com/williamfiset/algorithms/graphtheory/SteinerTree.java) **- O(V<sup>3</sup> + V<sup>2</sup> · 2<sup>T</sup> + V · 3<sup>T</sup>)**
 - [:movie_camera:](https://www.youtube.com/watch?v=wUgWX0nc4NY) [Tarjan's strongly connected components algorithm (adjacency list)](src/main/java/com/williamfiset/algorithms/graphtheory/TarjanSccSolverAdjacencyList.java) **- O(V+E)**
 - [:movie_camera:](https://www.youtube.com/watch?v=eL-KzMXSXXI) [Topological sort (acyclic graph, adjacency list)](src/main/java/com/williamfiset/algorithms/graphtheory/TopologicalSortAdjacencyList.java) **- O(V+E)**
 - [:movie_camera:](https://www.youtube.com/watch?v=cY4HiiFHO1o) [Traveling Salesman Problem (dynamic programming, iterative)](src/main/java/com/williamfiset/algorithms/graphtheory/TspDynamicProgrammingIterative.java) **- O(n<sup>2</sup>2<sup>n</sup>)**