[20250211] BOJ / 플래5 / 팀 편성 / 권혁준

Author: oncsr

khj20006/202502/11 BOJ P5 팀 편성.md

@@ -0,0 +1,91 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+
+class Main {
+	
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+	static int N;
+	static boolean[][] know;
+	static int[] vis;
+	static boolean res = true;
+	
+	public static void main(String[] args) throws Exception {
+		
+		ready();
+		solve();
+	
+		bwEnd();
+	}
+	
+	static void ready() throws Exception{
+
+		N = Integer.parseInt(br.readLine());
+		know = new boolean[N+1][N+1];
+		vis = new int[N+1];
+		nextLine();
+		for(int a = nextInt(), b = nextInt();a != -1;) {
+			know[a][b] = true;
+			know[b][a] = true;
+			nextLine();
+			a = nextInt();
+			b = nextInt();
+		}
+		
+	}
+	
+	static void solve() throws Exception{
+		
+		for(int i=1;i<=N;i++) if(vis[i] == 0) {
+			vis[i] = 1;
+			dfs(i,1);
+		}
+		if(!res) bw.write("-1");
+		else {
+			List<Integer> A = new ArrayList<>();
+			List<Integer> B = new ArrayList<>();
+			for(int i=1;i<=N;i++) if(vis[i] == 1) A.add(i); else B.add(i);
+			bw.write("1\n");
+			for(int i:A) bw.write(i+" ");
+			bw.write("-1\n");
+			for(int i:B) bw.write(i+" ");
+			bw.write("-1\n");
+		}
+		
+	}
+	
+	static void dfs(int n, int team) throws Exception {
+		if(!res) return;
+		List<Integer> next = new ArrayList<>();
+		int opposite = team == 1 ? 2 : 1;
+		for(int i=1;i<=N;i++) {
+			if(know[n][i] || i == n) continue;
+			if(vis[i] == 0) {
+				vis[i] = opposite;
+				next.add(i);
+				continue;
+			}
+			else if(vis[i] == opposite) continue;
+			res = false;
+			return;
+		}
+		for(int i:next) {
+			dfs(i,opposite);
+		}
+	}
+	
+}
+
+```