[20250807] BOJ / G5 / 소셜 네트워킹 어플리케이션 / 김수연

Author: suyeun84

suyeun84/202508/07 BOJ 소셜 네트워킹 어플리케이션.md

@@ -0,0 +1,77 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj7511 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static StringBuilder sb = new StringBuilder();
+
+	static int n, m;
+	static int[] parents;
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		int t = nextInt();
+		for(int a = 1 ; a <= t ; a++){
+            nextLine();
+            n = nextInt();
+
+            for(int i = 0 ; i < n ; i++) {
+            	parents[i] = i;
+            }
+
+            nextLine();
+            m = nextInt();
+
+            for(int i = 0 ; i < m ; i++) {
+            	nextLine();
+                int v1 = nextInt();
+                int v2 = nextInt();
+
+                if(find(v1) != find(v2)) {
+                    union(v1,v2);
+                }
+            }
+
+            nextLine();
+            int k = nextInt();
+
+            sb.append("Scenario "+a+":\n");
+
+            for(int i = 0 ; i < k ; i++){
+            	nextLine();
+                int v1 = nextInt();
+                int v2 = nextInt();
+
+                if(find(v1) == find(v2)) {
+                    sb.append("1\n");
+                }else{
+                    sb.append("0\n");
+                }
+            }sb.append("\n");
+        }
+
+        System.out.println(sb);
+        br.close();
+    }
+	
+	static int find(int x) {
+        if(x == parents[x])
+            return parents[x];
+
+        return parents[x] = find(parents[x]);
+    }
+
+    static void union(int x,int y) {
+        x = find(x);
+        y = find(y);
+
+        if(x < y)
+        	parents[y] = x;
+        else
+        	parents[x] = y;
+    }
+}
+```