I'm trying to solve a problem using Union Find, for storing Connected Components of a graph, and a Multiset for ordering the Components' Weights ... but i'm getting "SIGSECV ( Abort Called ) "... here is my code Link

Hello everyone :) today starts The 23rd Balkan Olympiad in Informatics. The onsite contest takes place in Ruse, Bulgaria, from June 28th to July 3rd. The first round starts today at 7:00 (GMT).You can solve problems and follow the entire contest so good luck to all official and unofficial participants._