BOJ_18243 : Small World Network

Author: spring0913

week7/BOJ_18243(Small World Network).java

@@ -0,0 +1,45 @@
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int N = Integer.parseInt(st.nextToken());
+        int M = Integer.parseInt(st.nextToken());
+        int[][] graph = new int[N+1][N+1];
+        for(int i=1; i<=N; i++) {
+            for(int j=1; j<=N; j++) {
+                if(i == j) {
+                    graph[i][j] = 0;
+                }else {
+                    graph[i][j] = 100;
+                }
+            }
+        }
+        for(int i=0; i<M; i++) {
+            st = new StringTokenizer(br.readLine());
+            int A = Integer.parseInt(st.nextToken());
+            int B = Integer.parseInt(st.nextToken());
+            graph[A][B] = graph[B][A] = 1;
+        }
+
+        for(int k=1; k<=N; k++) {
+            for(int i=1; i<=N; i++) {
+                for(int j=1; j<=N; j++) {
+                    graph[i][j] = Math.min(graph[i][j], graph[i][k] + graph[k][j]);
+                }
+            }
+        }
+        for(int i=1; i<=N; i++) {
+            for(int j=1; j<=N; j++) {
+                if(graph[i][j] > 6) {
+                    System.out.println("Big World!");
+                    return;
+                }
+            }
+        }
+        System.out.println("Small World!");
+    }
+}