노재경_homework6.java

//노재경

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();
        
        System.out.println("총 진행할 투표수를 입력해 주세요");
        int numVote = scanner.nextInt();

        System.out.println("가상 선거를 진행할 후보자 인원을 입력해주세요");
        int numCand = scanner.nextInt();
        scanner.nextLine(); 

        String[] candidates = new String[numCand];
        int[] arrVotes = new int[numCand];

        // 인코딩 오류 제거용 bufferedreader 사용.
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));

        for (int i = 0; i < numCand; i++) {
            System.out.printf("%d번째 후보자 이름을 입력해주세요: ", i + 1);
            candidates[i] = reader.readLine();
        }

        boolean tieExists;
        do {
            for (int i = 0; i < numCand; i++) {
                arrVotes[i] = 0; // 초기화
            }

            for (int i = 0; i < numVote; i++) {
                int targetNum = random.nextInt(numCand);
                String targetName = candidates[targetNum];

                arrVotes[targetNum] += 1;

                float totalRate = ((float) (i + 1) / numVote) * 100;

                System.out.printf("[투표진행률]: %.2f%%, %d명 투표 => %s\n", totalRate, (i + 1), targetName);
                for (int j = 0; j < numCand; j++) {
                    String name = candidates[j];
                    float rate = ((float) arrVotes[j] / numVote) * 100;
                    int vote = arrVotes[j];

                    System.out.printf("[기호:%d %s: %.2f%% (투표수: %d)]\n", j + 1, name, rate, vote);
                }
                System.out.println();
            }

            int maxVotes = 0;
            List<String> winners = new ArrayList<>();
            for (int i = 0; i < numCand; i++) {
                if (arrVotes[i] > maxVotes) {
                    maxVotes = arrVotes[i];
                    winners.clear();
                    winners.add(candidates[i]);
                } else if (arrVotes[i] == maxVotes) {
                    winners.add(candidates[i]);
                }
            }

            if (winners.size() > 1) {
                System.out.println("동점이 발생했습니다. 재투표를 진행합니다.");
                tieExists = true;
                // 동점 후보자만을 대상으로 재투표
                String[] tieCandidates = new String[winners.size()];
                winners.toArray(tieCandidates);
                candidates = tieCandidates;
                numCand = candidates.length;
            } else {
                tieExists = false;
                System.out.printf("[투표결과] 당선인: %s\n", winners.get(0));
            }
        } while (tieExists);

        scanner.close();
    }
}