[20251105] BOJ / G4 / 직사각형과 쿼리 / 이강현

Author: lkhyun

lkhyun/202511/05 BOJ G4 직사각형과 쿼리.md

@@ -0,0 +1,56 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringBuilder sb = new StringBuilder();
+    static StringTokenizer st;
+    public static void main(String[] args) throws Exception {
+        int N = Integer.parseInt(br.readLine());
+        int[][] mat = 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++) {
+                mat[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+        
+        int[][][] sum = new int[11][N + 1][N + 1];
+        
+        for (int k = 1; k <= 10; k++) {
+            for (int i = 1; i <= N; i++) {
+                for (int j = 1; j <= N; j++) {
+                    if(mat[i][j] == k) sum[k][i][j] = 1;
+                    else sum[k][i][j] = 0;
+                    
+                    sum[k][i][j] += (sum[k][i-1][j] + sum[k][i][j-1] - sum[k][i-1][j-1]);
+                }
+            }
+        }
+        
+        int Q = Integer.parseInt(br.readLine());
+        
+        for (int q = 0; q < Q; q++) {
+            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());
+            
+            int count = 0;
+            
+            for (int k = 1; k <= 10; k++) {
+                int result = sum[k][x2][y2] - sum[k][x1-1][y2] - sum[k][x2][y1-1] + sum[k][x1-1][y1-1];
+                
+                if (result > 0) count++;
+            }
+            
+            bw.write(count + "\n");
+        }
+        bw.close();
+    }
+}
+```