[SWEA] 1263 사람 네트워크 2 - JAVA

1. 문제

SW Expert Academy

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2. 풀이

• 사람 수만큼 BFS 탐색하고 그 최솟값을 출력했다.

import java.io.*;
import java.util.*;

public class D6_1263_사람네트워크2 {
   public static void main(String[] args) throws IOException {
      BufferedReader in =new BufferedReader(new InputStreamReader(System.in));
      StringBuilder sb = new StringBuilder();
      StringTokenizer st;
      int T = Integer.parseInt(in.readLine());
      for(int tc=1;tc<=T;tc++){
         st = new StringTokenizer(in.readLine());
         int N = Integer.parseInt(st.nextToken());
         int[][] adj = new int[N][N];

         for(int i=0;i<N;i++){
            for(int j=0;j<N;j++){
               adj[i][j] = Integer.parseInt(st.nextToken());
            }
         }

         int min = Integer.MAX_VALUE;
         for(int i=0;i<N;i++){
            int tmp = 0;
            int[] visited = new int[N];
            Queue<Integer> queue = new ArrayDeque<>();
            queue.offer(i);

            while(!queue.isEmpty()){
               int x = queue.poll();
               for(int j=0;j<N;j++){
                  if(i==j) continue;
                  if(visited[j]!=0 || adj[x][j]==0) continue;
                  visited[j] = visited[x]+1;
                  tmp += visited[j];
                  queue.offer(j);
               }
            }

            if(min>tmp) min = tmp;
         }

         sb.append("#").append(tc).append(" ").append(min).append("\n");
      }
      System.out.print(sb);
   }
}

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3. 결과