[20250206] BOJ / 골드2 / 로고 / 권혁준

khj20006/202502/06 BOJ G2 로고.md

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+import java.util.*;
+import java.io.*;
+
+class Rect{
+	int x, y, w, h;
+	Rect(int x, int y, int w, int h){
+		this.x = x;
+		this.y = y;
+		this.w = w;
+		this.h = h;
+	}
+}
+
+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 Rect[] arr;
+	static int N;
+	static int[] r;
+
+	public static void main(String[] args) throws Exception {
+
+		ready();
+		solve();
+
+		bwEnd();
+	}
+
+	static void ready() throws Exception{
+
+		N = Integer.parseInt(br.readLine());
+		r = new int[N+1];
+		for(int i=0;i<=N;i++) r[i] = i;
+		arr = new Rect[N+1];
+		arr[0] = new Rect(0,0,0,0);
+		for(int i=1;i<=N;i++) {
+			nextLine();
+			int x1 = nextInt();
+			int y1 = nextInt();
+			int x2 = nextInt();
+			int y2 = nextInt();
+			arr[i] = new Rect(x1, y1, x2-x1, y2-y1);
+		}
+
+	}
+
+	static void solve() throws Exception{
+
+		for(int i=1;i<=N;i++) {
+			for(int j=0;j<i;j++) {
+				if(!intersect(arr[i],arr[j])) continue;
+				int x = f(i), y = f(j);
+				if(x == y) continue;
+				r[x] = y;
+			}
+		}
+
+		int ans = 0;
+		boolean vis[] = new boolean[N+1];
+		vis[f(0)] = true;
+		for(int i=1;i<=N;i++) {
+			int x = f(i);
+			if(!vis[x]) {
+				vis[x] = true;
+				ans++;
+			}
+		}
+
+		bw.write(ans+"\n");
+
+	}
+
+	static boolean intersect(Rect a, Rect b) {
+		if(a.x + a.w < b.x) return false;
+		if(b.x + b.w < a.x) return false; 
+		if(a.y + a.h < b.y) return false;
+		if(b.y + b.h < a.y) return false;
+		if((a.x < b.x && b.x + b.w < a.x + a.w) && (a.y < b.y && b.y + b.h < a.y + a.h)) return false;
+		if((b.x < a.x && a.x + a.w < b.x + b.w) && (b.y < a.y && a.y + a.h < b.y + b.h)) return false;
+		return true;
+	}
+
+	static int f(int x) {return x==r[x] ? x : (r[x]=f(r[x]));}
+
+}