[20260214] BOJ / G3 / 스티커 붙이기 / 이준희

Author: JHLEE325

JHLEE325/202602/14 BOJ G3 스티커 붙이기.md

@@ -0,0 +1,88 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static int N, M, K;
+    static int[][] note;
+    static int R, C;
+    static int[][] sticker;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+        K = Integer.parseInt(st.nextToken());
+
+        note = new int[N][M];
+
+        for (int s = 0; s < K; s++) {
+            st = new StringTokenizer(br.readLine());
+            R = Integer.parseInt(st.nextToken());
+            C = Integer.parseInt(st.nextToken());
+            sticker = new int[R][C];
+
+            for (int i = 0; i < R; i++) {
+                st = new StringTokenizer(br.readLine());
+                for (int j = 0; j < C; j++) sticker[i][j] = Integer.parseInt(st.nextToken());
+            }
+
+            for (int d = 0; d < 4; d++) {
+                if (tryAttach()) break;
+                rotate();
+            }
+        }
+
+        int count = 0;
+        for (int i = 0; i < N; i++) {
+            for (int j = 0; j < M; j++) if (note[i][j] == 1) count++;
+        }
+        System.out.println(count);
+    }
+
+    static boolean tryAttach() {
+        for (int i = 0; i <= N - R; i++) {
+            for (int j = 0; j <= M - C; j++) {
+                if (canAttach(i, j)) {
+                    attach(i, j);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    static boolean canAttach(int y, int x) {
+        for (int i = 0; i < R; i++) {
+            for (int j = 0; j < C; j++) {
+                if (sticker[i][j] == 1 && note[y + i][x + j] == 1) return false;
+            }
+        }
+        return true;
+    }
+
+    static void attach(int y, int x) {
+        for (int i = 0; i < R; i++) {
+            for (int j = 0; j < C; j++) {
+                if (sticker[i][j] == 1) note[y + i][x + j] = 1;
+            }
+        }
+    }
+
+    static void rotate() {
+        int[][] temp = new int[C][R];
+        for (int i = 0; i < R; i++) {
+            for (int j = 0; j < C; j++) {
+                temp[j][R - 1 - i] = sticker[i][j];
+            }
+        }
+        sticker = temp;
+        int t = R;
+        R = C;
+        C = t;
+    }
+}
+```