[20250731] BOJ / G5 / 마법사 상어와 비바라기 / 이강현

lkhyun/202507/31 BOJ G5 마법사 상어와 비바라기.md

@@ -0,0 +1,93 @@
+```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 StringTokenizer st;
+    static int N,M;
+    static int[][] matrix;
+    static List<int[]> shiftList;
+    static List<int[]> cloudList;
+    static int[] di = {0,0,-1,-1,-1,0,1,1,1};
+    static int[] dj = {0,-1,-1,0,1,1,1,0,-1};
+
+    public static void main(String[] args) throws Exception {
+        st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        matrix = new int[N+1][N+1];
+        for (int i = 1; i <= N; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 1; j <= N; j++) {
+                matrix[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        shiftList = new ArrayList<>(M);
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+            shiftList.add(new int[]{Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken())});
+        }
+
+        cloudList = new ArrayList<>();
+        cloudList.add(new int[]{N,1});
+        cloudList.add(new int[]{N,2});
+        cloudList.add(new int[]{N-1,1});
+        cloudList.add(new int[]{N-1,2});
+
+        for (int[] curShift : shiftList) {
+            int cloudSize = cloudList.size();
+            for (int i = 0; i < cloudSize; i++) {
+                int[] cur = cloudList.get(i);
+                shift(cur, curShift[0],curShift[1]);
+                matrix[cur[0]][cur[1]]++;
+            }
+
+            for (int i = 0; i < cloudSize; i++) {
+                int[] cur = cloudList.get(i);
+                for (int j = 2; j <= 8; j+=2) {
+                    int ni = cur[0] + di[j];
+                    int nj = cur[1] + dj[j];
+                    if(ni>=1 && ni<=N && nj>=1 && nj<=N && matrix[ni][nj]>0){
+                        matrix[cur[0]][cur[1]]++;
+                    }
+                }
+            }
+
+            boolean[][] visited = new boolean[N+1][N+1];
+            for (int[] cur : cloudList) {
+                visited[cur[0]][cur[1]] = true;
+            }
+            cloudList.clear();
+
+            for (int i = 1; i <= N; i++) {
+                for (int j = 1; j <= N; j++) {
+                    if(!visited[i][j] && matrix[i][j]>=2){
+                        cloudList.add(new int[]{i,j});
+                        matrix[i][j] -= 2;
+                    }
+                }
+            }
+        }
+
+        int ans = 0;
+        for (int i = 1; i <= N; i++) {
+            for (int j = 1; j <= N; j++) {
+                ans += matrix[i][j];
+            }
+        }
+        bw.write(ans+"");
+        bw.close();
+    }
+    static void shift(int[] cur, int direction, int count){
+        cur[0] += di[direction]*count;
+        cur[1] += dj[direction]*count;
+
+        cur[0] = (((cur[0] - 1) % N) + N) % N + 1;
+        cur[1] = (((cur[1] - 1) % N) + N) % N + 1;
+    }
+}
+```