結果

問題 No.599 回文かい
ユーザー tanzaku
提出日時 2017-11-24 22:55:25
言語 Java
(openjdk 23)
結果
AC  
実行時間 1,155 ms / 4,000 ms
コード長 6,351 bytes
コンパイル時間 2,450 ms
コンパイル使用メモリ 87,764 KB
実行使用メモリ 54,772 KB
最終ジャッジ日時 2024-11-27 07:47:21
合計ジャッジ時間 8,032 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
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ファイルパターン 結果
other AC * 22
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 #
プレゼンテーションモードにする

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Random;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.Reader;
import java.io.InputStreamReader;
import java.io.InputStream;
/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        MyInput in = new MyInput(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskC solver = new TaskC();
        solver.solve(1, in, out);
        out.close();
    }
    static class TaskC {
        static final int mod = (int) 1e9 + 7;
        char[] cs;
        long[] memo;
        RollingHashMod hash;
        public void solve(int testNumber, MyInput in, PrintWriter out) {
            cs = in.nextChars();
            hash = new RollingHashMod(cs);
            memo = new long[cs.length + 1];
            out.println(rec(0));
        }
        long rec(int len) {
            if (memo[len] == 0) {
                long ans = 1;
                for (int i = 1; (i + len) * 2 <= cs.length; i++) {
//                dump(i, len, cs.length);
                    if (hash.hash(len, i + len) == hash.hash(cs.length - len - i, cs.length - len)) {
                        ans += rec(len + i);
                    }
                }
                memo[len] = ans % mod;
            }
            return memo[len];
        }
    }
    static class MyInput {
        private final BufferedReader in;
        private static int pos;
        private static int readLen;
        private static final char[] buffer = new char[1024 * 8];
        private static char[] str = new char[500 * 8 * 2];
        private static boolean[] isDigit = new boolean[256];
        private static boolean[] isSpace = new boolean[256];
        private static boolean[] isLineSep = new boolean[256];
        static {
            for (int i = 0; i < 10; i++) {
                isDigit['0' + i] = true;
            }
            isDigit['-'] = true;
            isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true;
            isLineSep['\r'] = isLineSep['\n'] = true;
        }
        public MyInput(InputStream is) {
            in = new BufferedReader(new InputStreamReader(is));
        }
        public int read() {
            if (pos >= readLen) {
                pos = 0;
                try {
                    readLen = in.read(buffer);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (readLen <= 0) {
                    throw new MyInput.EndOfFileRuntimeException();
                }
            }
            return buffer[pos++];
        }
        public char nextChar() {
            while (true) {
                final int c = read();
                if (!isSpace[c]) {
                    return (char) c;
                }
            }
        }
        int reads(int len, boolean[] accept) {
            try {
                while (true) {
                    final int c = read();
                    if (accept[c]) {
                        break;
                    }
                    if (str.length == len) {
                        char[] rep = new char[str.length * 3 / 2];
                        System.arraycopy(str, 0, rep, 0, str.length);
                        str = rep;
                    }
                    str[len++] = (char) c;
                }
            } catch (MyInput.EndOfFileRuntimeException e) {
            }
            return len;
        }
        public char[] nextChars() {
            int len = 0;
            str[len++] = nextChar();
            len = reads(len, isSpace);
            return Arrays.copyOf(str, len);
        }
        static class EndOfFileRuntimeException extends RuntimeException {
        }
    }
    static class RollingHashMod {
        private static final int[] LARGE_PRIMES = new int[]{
                1000000007, 1000000009, 1000000021, 1000000033,
                1000000087, 1000000093, 1000000097, 1000000103,
                1000000123, 1000000181, 1000000207, 1000000223,
                1000000241, 1000000271, 1000000289, 1000000297,
                1000000321, 1000000349, 1000000363, 1000000403,
        };
        private static final int HASH_NUM = 2;
        private static final long RADIX = 1000000003;
        private int n;
        private static int[] primes;
        private int[][] pow;
        private int[][] table;
        private int[][] table2;
        public RollingHashMod(char[] str) {
            if (primes == null) {
//          final Random random = new Random(System.currentTimeMillis());
                final Random random = new Random(0);
                primes = new int[HASH_NUM];
                for (int i = 0; i < HASH_NUM; i++) {
                    final int idx = random.nextInt(LARGE_PRIMES.length - i);
                    primes[i] = LARGE_PRIMES[idx];
                    LARGE_PRIMES[idx] = LARGE_PRIMES[LARGE_PRIMES.length - i - 1];
                    LARGE_PRIMES[LARGE_PRIMES.length - i - 1] = primes[i];
                }
            }
            n = str.length;
            table = new int[HASH_NUM][n + 1];
            table2 = new int[HASH_NUM][n + 1];
            pow = new int[HASH_NUM][n + 1];
            for (int j = 0; j < HASH_NUM; j++) {
                final int p = primes[j];
                pow[j][0] = 1;
                for (int i = 0; i < n; i++) {
                    table[j][i + 1] = (int) (((long) table[j][i] * RADIX + str[i]) % p);
                    table2[j][i + 1] = (int) (((long) table2[j][i] * RADIX + str[n - 1 - i]) % p);
                    pow[j][i + 1] = (int) ((long) pow[j][i] * RADIX % p);
                }
            }
        }
        public long hash(int i, int j) {
            assert (i <= j);
            long h0 = table[0][j] - (long) table[0][i] * pow[0][j - i] % primes[0];
            long h1 = table[1][j] - (long) table[1][i] * pow[1][j - i] % primes[1];
            if (h0 < 0) h0 += primes[0];
            if (h1 < 0) h1 += primes[1];
            return h0 << 32 | h1;
        }
    }
}
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