[20250211] BOJ / 플래3 / 도형 / 권혁준

khj20006/202502/11 BOJ P3 도형.md

@@ -0,0 +1,75 @@
+```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[] A;
+	static long[][] dp;
+	static long[][] sum;
+	static int N, K;
+
+	public static void main(String[] args) throws Exception {
+
+		ready();
+		solve();
+
+		bwEnd();
+	}
+
+	static void ready() throws Exception{
+
+		N = Integer.parseInt(br.readLine());
+		A = new int[N];
+		nextLine();
+		for(int i=0;i<N;i++) A[i] = nextInt();
+		K = Integer.parseInt(br.readLine());
+		dp = new long[500001][K+1];
+		sum = new long[500001][K+1];
+
+	}
+
+	static void solve() throws Exception{
+
+		Arrays.sort(A);
+		dp[A[0]][1] = 1;
+		sum[A[0]][1] = 1;
+		for(int i=1;i<N;i++) {
+			for(int s=500000;s>2*A[i];s--) {
+				for(int k=K;k>2;k--) {
+					dp[s][k] += sum[s-A[i]][k-1];
+				}
+			}
+			for(int s=500000;s>A[i];s--) {
+				for(int k=K;k>1;k--) {
+					sum[s][k] += sum[s-A[i]][k-1];
+				}
+			}
+			for(int s=500000;s>A[i];s--) if(dp[s-A[i]][1] != 0) dp[s][2] += dp[s-A[i]][1];
+			dp[A[i]][1]++;
+			sum[A[i]][1]++;
+		}
+
+		long ans = 0;
+		for(int i=1;i<=500000;i++) ans += dp[i][K];
+		bw.write(ans+"\n");
+
+	}
+
+}
+
+```

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);
+		}
+	}
+
+}
+
+```