[20250803] BOJ / P5 / 우주 정거장 / 권혁준

khj20006/202508/03 BOJ P5 우주 정거장.md

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+```java
+import java.util.*;
+import java.io.*;
+
+class IOController {
+    BufferedReader br;
+    BufferedWriter bw;
+    StringTokenizer st;
+
+    public IOController() {
+        br = new BufferedReader(new InputStreamReader(System.in));
+        bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        st = new StringTokenizer("");
+    }
+
+    String nextLine() throws Exception {
+        String line = br.readLine();
+        st = new StringTokenizer(line);
+        return line;
+    }
+
+    String nextToken() throws Exception {
+        while (!st.hasMoreTokens()) nextLine();
+        return st.nextToken();
+    }
+
+    int nextInt() throws Exception {
+        return Integer.parseInt(nextToken());
+    }
+
+    long nextLong() throws Exception {
+        return Long.parseLong(nextToken());
+    }
+
+    double nextDouble() throws Exception {
+        return Double.parseDouble(nextToken());
+    }
+
+    void close() throws Exception {
+        bw.flush();
+        bw.close();
+    }
+
+    void write(String content) throws Exception {
+        bw.write(content);
+    }
+
+}
+
+class Line {
+    int s, e, num;
+    Line(int s, int e, int num) {
+        this.s = s;
+        this.e = e;
+        this.num = num;
+    }
+}
+
+public class Main {
+
+    static IOController io;
+
+    //
+
+    static int N, Q;
+    static int[] r;
+    static Line[] x, y;
+
+    static int f(int x) {return x==r[x] ? x : (r[x]=f(r[x]));}
+
+    public static void main(String[] args) throws Exception {
+
+        io = new IOController();
+
+        init();
+        solve();
+
+        io.close();
+
+    }
+
+    static void init() throws Exception {
+
+        N = io.nextInt();
+        Q = io.nextInt();
+        x = new Line[N];
+        y = new Line[N];
+        r = new int[N];
+        for(int i=0;i<N;i++) {
+            r[i] = i;
+            int x1 = io.nextInt();
+            int y1 = io.nextInt();
+            int x2 = io.nextInt();
+            int y2 = io.nextInt();
+            if(x1 > x2) {
+                int tmp = x1;
+                x1 = x2;
+                x2 = tmp;
+            }
+            if(y1 > y2) {
+                int tmp = y1;
+                y1 = y2;
+                y2 = tmp;
+            }
+
+            x[i] = new Line(x1, x2, i);
+            y[i] = new Line(y1, y2, i);
+        }
+
+    }
+
+    static void solve() throws Exception {
+
+        connect(x);
+        connect(y);
+        while(Q-->0) {
+            int a = f(io.nextInt()-1), b = f(io.nextInt()-1);
+            io.write((a==b ? "1\n" : "0\n"));
+        }
+
+    }
+
+    static void connect(Line[] arr) {
+        Arrays.sort(arr, (a,b) -> a.s==b.s ? a.e-b.e : a.s-b.s);
+        int max = arr[0].e, idx = arr[0].num;
+        for(int i=1;i<arr.length;i++) {
+            if(arr[i].s <= max) {
+                int a = f(arr[i].num), b = f(idx);
+                if(a != b) r[a] = b;
+            }
+            if(arr[i].e > max) {
+                max = arr[i].e;
+                idx = arr[i].num;
+            }
+        }
+    }
+
+}
+```