241210 배열 복원하기

public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	StringTokenizer st = new StringTokenizer(br.readLine());

	int height = Integer.parseInt(st.nextToken());
	int width = Integer.parseInt(st.nextToken());
	int offsetX = Integer.parseInt(st.nextToken());
	int offsetY = Integer.parseInt(st.nextToken());
	StringBuilder sb = new StringBuilder();

	int[][] a = new int[height][width];
	for (int i = 0; i < height; i++) {
		st = new StringTokenizer(br.readLine());
		for (int j = 0; j < width; j++) {
			int value = Integer.parseInt(st.nextToken());
			if (i >= offsetX && j >= offsetY) {
				a[i][j] = value - a[i - offsetX][j - offsetY];
			} else {
				a[i][j] = value;
			}
			sb.append(a[i][j]).append(" ");
		}
		sb.append("\n");
	}

	System.out.print(sb);
}

출처:https://www.acmicpc.net/problem/16967