code: def PluRunOff_single_winner(self, profile):
          
  
          # Currently, we expect the profile to contain complete ordering over candidates. Ties are
          # allowed however.
          elecType = profile.getElecType()
          if elecType != "soc" and elecType != "toc" and elecType != "csv":
              print("ERROR: unsupported election type")
              exit()
  
          # Initialization
          prefcounts = profile.getPreferenceCounts()
          len_prefcounts = len(prefcounts)
          rankmaps = profile.getRankMaps()
          ranking = MechanismPlurality().getRanking(profile)
  
          # 1st round: find the top 2 candidates in plurality scores
          # Compute the 1st-place candidate in plurality scores
          # print(ranking)
          max_cand = ranking[0][0][0]
  
          # Compute the 2nd-place candidate in plurality scores
          # Automatically using tie-breaking rule--numerically increasing order
          if len(ranking[0][0]) > 1:
              second_max_cand = ranking[0][0][1]
          else:
              second_max_cand = ranking[0][1][0]
  
          top_2 = [max_cand, second_max_cand]
          # 2nd round: find the candidate with maximum plurality score
          dict_top2 = {max_cand: 0, second_max_cand: 0}
          for i in range(len_prefcounts):
              vote_top2 = {key: value for key, value in rankmaps[i].items() if key in top_2}
              top_position = min(vote_top2.values())
              keys = [x for x in vote_top2.keys() if vote_top2[x] == top_position]
              for key in keys:
                  dict_top2[key] += prefcounts[i]
  
          # print(dict_top2)
          winner = max(dict_top2.items(), key=lambda x: x[1])[0]
  
          return winner
docs: Returns a number that associates the winner of a profile under Plurality with Runoff rule.
  
          :ivar Profile profile: A Profile object that represents an election profile.