[20251105] BOJ / G4 / 직사각형과 쿼리 / 설진영

Seol-JY/202511/05 BOJ G4 직사각형과 쿼리.md

@@ -0,0 +1,43 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringBuilder sb = new StringBuilder();
+
+        int n = Integer.parseInt(br.readLine());
+        int[][] matrix = new int[n + 1][n + 1];
+
+        for (int i = 1; i <= n; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            for (int j = 1; j <= n; j++) {
+                matrix[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        int q = Integer.parseInt(br.readLine());
+
+        for (int i = 0; i < q; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int x1 = Integer.parseInt(st.nextToken());
+            int y1 = Integer.parseInt(st.nextToken());
+            int x2 = Integer.parseInt(st.nextToken());
+            int y2 = Integer.parseInt(st.nextToken());
+
+            Set<Integer> distinctNumbers = new HashSet<>();
+
+            for (int x = x1; x <= x2; x++) {
+                for (int y = y1; y <= y2; y++) {
+                    distinctNumbers.add(matrix[x][y]);
+                }
+            }
+
+            sb.append(distinctNumbers.size()).append('\n');
+        }
+
+        System.out.print(sb);
+    }
+}
+```