結果

問題 No.697 池の数はいくつか
ユーザー GrenacheGrenache
提出日時 2018-09-22 11:36:25
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 5,820 bytes
コンパイル時間 4,842 ms
コンパイル使用メモリ 81,148 KB
実行使用メモリ 181,600 KB
最終ジャッジ日時 2024-11-25 14:19:59
合計ジャッジ時間 17,252 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 55 ms
50,268 KB
testcase_01 AC 56 ms
50,148 KB
testcase_02 AC 55 ms
50,072 KB
testcase_03 AC 55 ms
50,000 KB
testcase_04 WA -
testcase_05 AC 55 ms
50,404 KB
testcase_06 AC 55 ms
50,012 KB
testcase_07 AC 54 ms
50,192 KB
testcase_08 AC 54 ms
49,884 KB
testcase_09 AC 54 ms
50,304 KB
testcase_10 AC 53 ms
50,476 KB
testcase_11 AC 54 ms
50,396 KB
testcase_12 AC 54 ms
50,440 KB
testcase_13 AC 56 ms
50,400 KB
testcase_14 WA -
testcase_15 WA -
testcase_16 AC 55 ms
50,436 KB
testcase_17 AC 55 ms
50,092 KB
testcase_18 WA -
testcase_19 WA -
testcase_20 AC 54 ms
50,392 KB
testcase_21 AC 53 ms
49,932 KB
testcase_22 AC 54 ms
50,072 KB
testcase_23 AC 55 ms
50,016 KB
testcase_24 AC 343 ms
57,444 KB
testcase_25 AC 363 ms
56,964 KB
testcase_26 AC 353 ms
57,348 KB
testcase_27 AC 363 ms
57,024 KB
testcase_28 AC 339 ms
57,152 KB
testcase_29 AC 1,699 ms
181,600 KB
testcase_30 AC 1,126 ms
59,312 KB
testcase_31 AC 1,730 ms
181,488 KB
testcase_32 AC 1,166 ms
59,160 KB
testcase_33 AC 1,067 ms
59,100 KB
testcase_34 AC 1,142 ms
59,296 KB
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ソースコード

diff # 

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();

		BitSet a = new BitSet(h * w);
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				if (sc.nextInt() == 1) {
					a.set(i * h + j);
				}
			}
		}

		int cnt = 0;
		BitSet used = new BitSet(h * w);
		
		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {
				int index = i * h + j;
				if (!used.get(index) && a.get(index)) {
					cnt++;

					used.set(index);
					Deque<Integer> st = new ArrayDeque<>();
					st.push(i * 10000 + j);
					while (!st.isEmpty()) {
						int e = st.pop();
						int x = e % 10000;
						int y = e / 10000;
						
						for (int k = 0; k < 4; k++) {
							int nextx = x + dx[k];
							int nexty = y + dy[k];
							int nindex = nexty * h + nextx;
							
							if (nextx < 0 || nextx >= w || nexty < 0 || nexty >= h) {
								continue;
							}
							if (used.get(nindex) || !a.get(nindex)) {
								continue;
							}

							used.set(nindex);
							st.push(nexty * 10000 + nextx);
						}
					}
				}
			}
		}

		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);
		}
	}
}
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