Merge pull request #948 from AlgorithmWithGod/JHLEE325

[20250922] BOJ / G5 / 회장뽑기 / 이준희

Author: ShinHeeEul

JHLEE325/202509/22 BOJ G5 회장뽑기.md

@@ -0,0 +1,67 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static final int INF = 987654321;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        StringBuilder sb = new StringBuilder();
+
+        int n = Integer.parseInt(br.readLine());
+        int[][] arr = new int[n + 1][n + 1];
+
+        for (int i = 1; i <= n; i++) {
+            for (int j = 1; j <= n; j++) {
+                if (i == j) arr[i][j] = 0;
+                else arr[i][j] = INF;
+            }
+        }
+
+        while (true) {
+            st = new StringTokenizer(br.readLine());
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+            if (a == -1 && b == -1) break;
+            arr[a][b] = 1;
+            arr[b][a] = 1;
+        }
+
+        for (int k = 1; k <= n; k++) {
+            for (int i = 1; i <= n; i++) {
+                for (int j = 1; j <= n; j++) {
+                    if (arr[i][j] > arr[i][k] + arr[k][j]) {
+                        arr[i][j] = arr[i][k] + arr[k][j];
+                    }
+                }
+            }
+        }
+
+        int[] score = new int[n + 1];
+        int minScore = INF;
+        for (int i = 1; i <= n; i++) {
+            int maxDist = 0;
+            for (int j = 1; j <= n; j++) {
+                maxDist = Math.max(maxDist, arr[i][j]);
+            }
+            score[i] = maxDist;
+            minScore = Math.min(minScore, maxDist);
+        }
+
+        List<Integer> candidates = new ArrayList<>();
+        for (int i = 1; i <= n; i++) {
+            if (score[i] == minScore) {
+                candidates.add(i);
+            }
+        }
+
+        sb.append(minScore).append(" ").append(candidates.size()).append("\n");
+        for (int c : candidates) {
+            sb.append(c).append(" ");
+        }
+        System.out.println(sb.toString());
+    }
+}
+```