Update index.md

Punctuation

Author: gabriel-vanca

topics/infoarena/index.md

@@ -5,9 +5,9 @@ github_url: https://github.com/topics/infoarena
 logo: infoarena.png
 created_by: Cristian Strat, Mircea Pasoi, Silviu-Ionut Ganceanu, Dan-Leonard Crestez
 released: April 28, 2003
-short_description: Algorithm & Data Structure problems for Infoarena.ro
+short_description: Algorithm and Data Structure problems for Infoarena.ro.
 topic: infoarena
-related: cplusplus, algorithms, cpp, graph-algorithms, competitive-programming, data-structures, binary-search-tree, string-manipulation, sorting-algorithms, graph-theory, dynamic-programming, greedy-algorithms, dijkstra-algorithm, matrix-algebra, geometry-algorithms, lowest-common-ancestor, trie-data-structure
+related: cplusplus, algorithms, competitive-programming, data-structures, string-manipulation, graph-theory, dynamic-programming, greedy-algorithms, matrix-algebra, geometry-algorithms
 url: https://www.infoarena.ro/
 ---
 Infoarena.ro is the the biggest Romanian online community helping thousands of young students learn and train for national and international Computer Science contests, supported by a team of former Olympic students.