[Level 1] 신고 결과 받기

import java.util.*;

class Solution {
    public int[] solution(String[] id_list, String[] report, int k) {
        int[] answer = new int[id_list.length];
        int[][] table = new int[id_list.length][id_list.length];
        int[] sum = new int[id_list.length];
        Set<String> set = new HashSet<>();
        Map<String, Integer> map = new HashMap<>();
        
        for(int i=0; i<id_list.length; i++) { map.put(id_list[i], i); }
        for(String r : report) { set.add(r); }
        
        Iterator<String> iterator = set.iterator();
        
        while(iterator.hasNext()) {
            String[] arr = iterator.next().split(" ");
            table[map.get(arr[0])][map.get(arr[1])]++;
        }
        
        for(int i=0; i<id_list.length; i++) {
            for(int j=0; j<id_list.length; j++) { sum[i] += table[j][i]; }
        }
        
        for(int i=0; i<id_list.length; i++) {
            for(int j=0; j<id_list.length; j++) {
                if(sum[j]>=k && table[i][j]==1) { answer[i]++; }
            }
        }
        
        return answer;
    }
}