結果

問題 No.228 ゆきこちゃんの 15 パズル
コンテスト
ユーザー suigingin
提出日時 2015-06-19 22:53:23
言語 Java
(openjdk 23)
結果
AC  
実行時間 110 ms / 5,000 ms
コード長 4,128 bytes
コンパイル時間 3,193 ms
コンパイル使用メモリ 79,408 KB
実行使用メモリ 54,220 KB
最終ジャッジ日時 2024-07-07 04:10:10
合計ジャッジ時間 6,325 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 17
権限があれば一括ダウンロードができます

ソースコード

diff # 

import java.util.Arrays;
import java.util.Scanner;

public class M2 {
	MyScanner sc = new MyScanner();
	Scanner sc2 = new Scanner(System.in);
	long start = System.currentTimeMillis();
	long fin = System.currentTimeMillis();
	final int MOD = 1000000007;
	int[] dx = { 1, 0, 0, -1 };
	int[] dy = { 0, 1, -1, 0 };

	int[][] n;
	boolean[] used;
	boolean ok;

	void run() {
		n = sc.nextInt2dArray(4, 4);
		used = new boolean[16];
		ok = false;

		int sh = 0;
		int sw = 0;
		for (int i = 0; i < 4; i++) {
			for (int j = 0; j < 4; j++) {
				if (n[i][j] == -1) {
					sh = i;
					sw = j;
					break;
				}
			}
		}

		dfs(n, sh, sw);
		System.out.println(ok ? "Yes" : "No");

	}

	void dfs(int[][] order, int h, int w) {
	
		if(ok) return;
		
		if (judge(order)) {
			ok = true;
			return;
		}

		for (int i = 0; i < 4; i++) {
			int nexth = h + dy[i];
			int nextw = w + dx[i];
			if (inner(nexth, nextw, 4, 4)) {
				int number = order[nexth][nextw];
				if (!used[number]) {
					used[number] = true;
					order[nexth][nextw] = order[h][w];
					order[h][w] = number;
					dfs(order, nexth, nextw);
					used[number] = false;
					order[h][w] = -1;
					order[nexth][nextw] = number;
				}
			}
		}
	}

	boolean judge(int[][] order) {
		int n = 0;
		for (int i = 0; i < 4; i++) {
			for (int j = 0; j < 4; j++) {
				if (i == 3 && j == 3)
					break;
				if (order[i][j] != n++)
					return false;
			}
		}
		return order[3][3] == -1 ? true : false;
	}

	void dfs(int[] order) {

	}

	public static void main(String[] args) {
		new M2().run();
	}

	void debug(Object... o) {
		System.out.println(Arrays.deepToString(o));
	}

	void debug2(char[][] array) {
		for (int i = 0; i < array.length; i++) {
			for (int j = 0; j < array[i].length; j++) {
				System.out.print(array[i][j]);
			}
			System.out.println();
		}
	}

	boolean inner(int h, int w, int limH, int limW) {
		return 0 <= h && h < limH && 0 <= w && w < limW;
	}

	void swap(int[] x, int a, int b) {
		int tmp = x[a];
		x[a] = x[b];
		x[b] = tmp;
	}

	// find minimum i (a[i] >= border)
	int lower_bound(int a[], int border) {
		int l = -1;
		int r = a.length;
		while (r - l > 1) {
			int mid = (l + r) / 2;
			if (border <= a[mid]) {
				r = mid;
			} else {
				l = mid;
			}
		}
		// r = l + 1
		return r;
	}

	boolean palindrome(String s) {
		for (int i = 0; i < s.length() / 2; i++) {
			if (s.charAt(i) != s.charAt(s.length() - 1 - i)) {
				return false;
			}
		}
		return true;
	}

	class MyScanner {
		int nextInt() {
			try {
				int c = System.in.read();
				while (c != '-' && (c < '0' || '9' < c))
					c = System.in.read();
				if (c == '-')
					return -nextInt();
				int res = 0;
				do {
					res *= 10;
					res += c - '0';
					c = System.in.read();
				} while ('0' <= c && c <= '9');
				return res;
			} catch (Exception e) {
				return -1;
			}
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		String next() {
			try {
				StringBuilder res = new StringBuilder("");
				int c = System.in.read();
				while (Character.isWhitespace(c))
					c = System.in.read();
				do {
					res.append((char) c);
				} while (!Character.isWhitespace(c = System.in.read()));
				return res.toString();
			} catch (Exception e) {
				return null;
			}
		}

		int[] nextIntArray(int n) {
			int[] in = new int[n];
			for (int i = 0; i < n; i++) {
				in[i] = nextInt() - 1;
			}
			return in;
		}

		int[][] nextInt2dArray(int n, int m) {
			int[][] in = new int[n][m];
			for (int i = 0; i < n; i++) {
				in[i] = nextIntArray(m);
			}
			return in;
		}

		double[] nextDoubleArray(int n) {
			double[] in = new double[n];
			for (int i = 0; i < n; i++) {
				in[i] = nextDouble();
			}
			return in;
		}

		long[] nextLongArray(int n) {
			long[] in = new long[n];
			for (int i = 0; i < n; i++) {
				in[i] = nextLong();
			}
			return in;
		}

		char[][] nextCharField(int n, int m) {
			char[][] in = new char[n][m];
			for (int i = 0; i < n; i++) {
				String s = sc.next();
				for (int j = 0; j < m; j++) {
					in[i][j] = s.charAt(j);
				}
			}
			return in;
		}
	}
}
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