#286599 (Java21) No.697 池の数はいくつか

• 問題: No.697 池の数はいくつか
• ユーザー: Grenache
• 提出日時: 2018-09-22 11:16:29
• 言語: Java21 (openjdk 21)
• 結果: MLE
• 実行時間: -
• コード長: 5,758 bytes
• コンパイル時間: 4,892 ms
• コンパイル使用メモリ: 76,860 KB
• 実行使用メモリ: 308,076 KB
• 最終ジャッジ日時: 2023-08-16 22:50:43
• 合計ジャッジ時間: 18,490 ms
• ジャッジサーバーID （参考情報）: judge14 / judge13

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	46 ms; 49,120 KB
testcase_01	AC	45 ms; 49,084 KB
testcase_02	AC	45 ms; 49,140 KB
testcase_03	AC	48 ms; 49,140 KB
testcase_04	AC	46 ms; 49,092 KB
testcase_05	AC	47 ms; 47,396 KB
testcase_06	AC	47 ms; 49,284 KB
testcase_07	AC	47 ms; 49,236 KB
testcase_08	AC	45 ms; 49,148 KB
testcase_09	AC	46 ms; 49,248 KB
testcase_10	AC	46 ms; 49,468 KB
testcase_11	AC	46 ms; 49,284 KB
testcase_12	AC	45 ms; 49,328 KB
testcase_13	AC	47 ms; 48,996 KB
testcase_14	AC	47 ms; 49,348 KB
testcase_15	AC	47 ms; 48,968 KB
testcase_16	AC	46 ms; 49,144 KB
testcase_17	AC	46 ms; 49,260 KB
testcase_18	AC	46 ms; 49,044 KB
testcase_19	AC	47 ms; 49,064 KB
testcase_20	AC	46 ms; 49,472 KB
testcase_21	AC	46 ms; 49,468 KB
testcase_22	AC	47 ms; 49,096 KB
testcase_23	AC	46 ms; 48,992 KB
testcase_24	AC	324 ms; 63,324 KB
testcase_25	AC	315 ms; 62,492 KB
testcase_26	AC	323 ms; 62,760 KB
testcase_27	AC	365 ms; 62,836 KB
testcase_28	AC	336 ms; 63,084 KB
testcase_29	MLE	-
testcase_30	AC	1,268 ms; 170,932 KB
testcase_31	MLE	-
testcase_32	AC	1,276 ms; 170,980 KB
testcase_33	AC	1,287 ms; 171,004 KB
testcase_34	AC	1,270 ms; 171,084 KB

ソースコード

import java.io.*;
import java.util.*;


public class Main_yukicoder697 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
//		4近傍
		int[] dx = { 1, 0, -1, 0 };
		int[] dy = { 0, 1, 0, -1 };

		int h = sc.nextInt();
		int w = sc.nextInt();

		int[][] a = new int[h][w];
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				a[i][j] = sc.nextInt();
			}
		}

		int cnt = 0;
		int[][] used = new int[h][w];
		for (int i = 0; i < h; i++) {
			Arrays.fill(used[i], -1);
		}
		
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (used[i][j] == -1 && a[i][j] == 1) {
					cnt++;

					used[i][j] = cnt;
					Deque<Pair> st = new ArrayDeque<>();
					st.push(new Pair(j, i));
					while (!st.isEmpty()) {
						Pair e = st.pop();
						
						for (int k = 0; k < 4; k++) {
							int nextx = e.a + dx[k];
							int nexty = e.b + dy[k];
							
							if (nextx < 0 || nextx >= w || nexty < 0 || nexty >= h) {
								continue;
							}
							if (used[nexty][nextx] > 0 || a[nexty][nextx] == 0) {
								continue;
							}

							used[nexty][nextx] = cnt;
							st.push(new Pair(nextx, nexty));
						}
					}
				}
			}
		}

		pr.println(cnt);
	}

	static class Pair implements Comparable<Pair> {
		int a;
		int b;

		Pair(int a, int b) {
			this.a = a;
			this.b = b;
		}

		@Override
		public int compareTo(Pair o) {
			if (a == o.a) {
				return Integer.compare(b, o.b);
			}

			return Integer.compare(a, o.a);
		}

		@Override
		public int hashCode() {
			return Integer.hashCode(a + b);
		}

		@Override
		public boolean equals(Object obj) {
			Pair o = (Pair) obj;
			return a == o.a && b == o.b;
		}

		@Override
		public String toString() {
			// [xxx, xxxx]
			StringBuilder stmp = new StringBuilder(32);
			stmp.append('[');
			stmp.append(a);
			stmp.append(',');
			stmp.append(' ');
			stmp.append(b);
			stmp.append(']');

			return stmp.toString();
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(INPUT == null ? System.in : new ByteArrayInputStream(INPUT.getBytes()));
		pr = new Printer(System.out);

		solve();

//		pr.close();
		pr.flush();
//		sc.close();
	}

	static String INPUT = null;

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		private boolean isPrintable(int ch) {
			return ch >= '!' && ch <= '~';
		}

		private boolean isCRLF(int ch) {
			return ch == '\n' || ch == '\r' || ch == -1;
		}

		private int nextPrintable() {
			try {
				int ch;
				while (!isPrintable(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}

				return ch;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		String next() {
			try {
				int ch = nextPrintable();
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (isPrintable(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		int nextInt() {
			try {
				// parseInt from Integer.parseInt()
				boolean negative = false;
				int res = 0;
				int limit = -Integer.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Integer.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				int multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		long nextLong() {
			try {
				// parseLong from Long.parseLong()
				boolean negative = false;
				long res = 0;
				long limit = -Long.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Long.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				long multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		float nextFloat() {
			return Float.parseFloat(next());
		}

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

		String nextLine() {
			try {
				int ch;
				while (isCRLF(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (!isCRLF(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new NoSuchElementException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(OutputStream out) {
			super(out);
		}
	}
}