結果

問題 No.1493 隣接xor
ユーザー hiromi_ayasehiromi_ayase
提出日時 2021-05-01 14:51:08
言語 Java21
(openjdk 21)
結果
WA  
実行時間 -
コード長 2,967 bytes
コンパイル時間 3,094 ms
コンパイル使用メモリ 89,668 KB
実行使用メモリ 81,152 KB
最終ジャッジ日時 2024-07-19 22:40:39
合計ジャッジ時間 15,770 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)

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 67 ms
38,176 KB
testcase_01 AC 68 ms
38,076 KB
testcase_02 AC 73 ms
38,388 KB
testcase_03 WA -
testcase_04 WA -
testcase_05 AC 460 ms
65,732 KB
testcase_06 AC 459 ms
65,520 KB
testcase_07 WA -
testcase_08 AC 469 ms
65,548 KB
testcase_09 AC 447 ms
65,412 KB
testcase_10 AC 464 ms
65,628 KB
testcase_11 AC 454 ms
65,880 KB
testcase_12 WA -
testcase_13 WA -
testcase_14 WA -
testcase_15 AC 65 ms
38,444 KB
testcase_16 AC 65 ms
38,212 KB
testcase_17 AC 67 ms
38,432 KB
testcase_18 AC 68 ms
38,340 KB
testcase_19 AC 69 ms
37,940 KB
testcase_20 AC 346 ms
55,140 KB
testcase_21 AC 379 ms
55,656 KB
testcase_22 AC 316 ms
52,172 KB
testcase_23 WA -
testcase_24 WA -
testcase_25 WA -
testcase_26 WA -
testcase_27 AC 273 ms
48,300 KB
testcase_28 WA -
testcase_29 WA -
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.*;

@SuppressWarnings("unused")
public class Main {

  private static void solve() {
    int n = ni();
    int[] a = na(n);

    int mod = (int) 1e9 + 7;
    long[] dp = new long[n + 1];
    long[] sdp = new long[n + 1];

    dp[0] = sdp[0] = 1;
    Map<Integer, Integer> map = new HashMap<>();
    int x = 0;
    for (int i = 0; i < n; i++) {
      x ^= a[i];

      int from = map.getOrDefault(x, -1);
      dp[i + 1] = sdp[i] - (from >= 0 ? sdp[from] : 0);
      dp[i + 1] %= mod;
      sdp[i + 1] = dp[i + 1] + sdp[i];
      sdp[i + 1] %= mod;
      map.put(x, i);
    }
    System.out.println(dp[n]);
  }

  public static void main(String[] args) {
    new Thread(null, new Runnable() {
      @Override
      public void run() {
        long start = System.currentTimeMillis();
        String debug = args.length > 0 ? args[0] : null;
        if (debug != null) {
          try {
            is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));
          } catch (Exception e) {
            throw new RuntimeException(e);
          }
        }
        reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);
        solve();
        out.flush();
        tr((System.currentTimeMillis() - start) + "ms");
      }
    }, "", 64000000).start();
  }

  private static java.io.InputStream is = System.in;
  private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);
  private static java.util.StringTokenizer tokenizer = null;
  private static java.io.BufferedReader reader;

  public static String next() {
    while (tokenizer == null || !tokenizer.hasMoreTokens()) {
      try {
        tokenizer = new java.util.StringTokenizer(reader.readLine());
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
    return tokenizer.nextToken();
  }

  private static double nd() {
    return Double.parseDouble(next());
  }

  private static long nl() {
    return Long.parseLong(next());
  }

  private static int[] na(int n) {
    int[] a = new int[n];
    for (int i = 0; i < n; i++)
      a[i] = ni();
    return a;
  }

  private static char[] ns() {
    return next().toCharArray();
  }

  private static long[] nal(int n) {
    long[] a = new long[n];
    for (int i = 0; i < n; i++)
      a[i] = nl();
    return a;
  }

  private static int[][] ntable(int n, int m) {
    int[][] table = new int[n][m];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[i][j] = ni();
      }
    }
    return table;
  }

  private static int[][] nlist(int n, int m) {
    int[][] table = new int[m][n];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[j][i] = ni();
      }
    }
    return table;
  }

  private static int ni() {
    return Integer.parseInt(next());
  }

  private static void tr(Object... o) {
    if (is != System.in)
      System.out.println(java.util.Arrays.deepToString(o));
  }
}
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