Merge branch 'main' of github.com:CodingThrust/problem-reductions

Author: GiggleLiu

.github/ISSUE_TEMPLATE/problem.md

@@ -10,7 +10,6 @@ assignees: ''
 ## Definition
 
 **Name:** <!-- e.g. MaximumIndependentSet. Use Maximum/Minimum prefix for optimization problems -->
-**Category:** <!-- graph / satisfiability / set / optimization / specialized -->
 **Reference:** <!-- URL or citation for the formal definition -->
 
 <!-- Formal definition: input, feasibility constraints, and objective.