AlgoExpert Tournament Winner

 

import java.util.*;

class Program {

  public String tournamentWinner(
    String finalWinner = "";
    int finalWinNum = 0;
    for(int i = 0; i < results.size(); i++){
      int winIndex = results.get(i);
      ArrayList<String> comp = competitions.get(i);
      String winner = comp.get(winIndex == 0 ? 1 : 0);
      int oldScore = teamData.containsKey(winner) ? teamData.get(winner) : 0;
      int newScore = oldScore + 3; 
      if (newScore > finalWinNum){
        finalWinner = winner;
        finalWinNum = newScore;
      }
      teamData.put(winner, newScore);
    }
    return finalWinner;
  }
}