結果

問題 No.464 PPAP
ユーザー 紙ぺーぱー紙ぺーぱー
提出日時 2016-12-15 23:02:37
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 70 ms / 2,000 ms
コード長 7,195 bytes
コンパイル時間 1,227 ms
コンパイル使用メモリ 111,488 KB
実行使用メモリ 17,664 KB
最終ジャッジ日時 2024-11-30 08:55:02
合計ジャッジ時間 2,758 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge5
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 * 4
other AC * 22
権限があれば一括ダウンロードができます
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc)
Copyright (C) Microsoft Corporation. All rights reserved.

ソースコード

diff # 

using System;
using System.Linq;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using StringBuilder = System.Text.StringBuilder;
using System.Numerics;
using Point = System.Numerics.Complex;
using Number = System.Int64;
using C = System.Int32;
namespace Program
{
    public class Solver
    {
        public void Solve()
        {
            var s = sc.Scan();
            var n = s.Length;
            var plen = StringEx.ManacherWithEven(s);
            Debug.WriteLine(plen.AsJoinedString());
            var pl = new long[n+1];
            var pp = new long[n+1];
            var pr = new long[n+3];
            for (int i = 0; i < n; i++)
            {
                var odd = plen[i * 2];
                for (int k = 0; k < odd; k++)
                {
                    var l = i - k;
                    var r = i + k;
                    if (l == 0) pl[r]++;
                    if (l > 0)
                        pp[r] += pl[l - 1];
                    if (r == n - 1) pr[l]++;
                }
                var even = plen[i * 2 + 1];
                for (int k = 0; k < even; k++)
                {
                    var l = i - k;
                    var r = i+k+1;
                    if (l == 0) pl[r]++;
                    if (l > 0) pp[r] += pl[l - 1];
                    if (r == n - 1) pr[l]++;
                }
            }
            Debug.WriteLine(pl.AsJoinedString());
            Debug.WriteLine(pp.AsJoinedString());
            Debug.WriteLine(pr.AsJoinedString());
            for (int i = n - 1; i >= 0; i--)
                pr[i] += pr[i + 1];
            var ans = 0L;
            for (int i = 0; i < n; i++)
                ans += pp[i] * pr[i + 2];
            IO.Printer.Out.WriteLine(ans);
        }
        public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());
        static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; }
        static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
    }
}

#region main
static class Ex
{
    static public string AsString(this IEnumerable<char> ie) { return new string(System.Linq.Enumerable.ToArray(ie)); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") { return string.Join(st, ie); }
    static public void Main()
    {
        var solver = new Program.Solver();
        solver.Solve();
        Program.IO.Printer.Out.Flush();
    }
}
#endregion
#region Ex
namespace Program.IO
{
    using System.IO;
    using System.Text;
    using System.Globalization;
    public class Printer: StreamWriter
    {
        static Printer() { Out = new Printer(Console.OpenStandardOutput()) { AutoFlush = false }; }
        public static Printer Out { get; set; }
        public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
        public Printer(System.IO.Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
        public Printer(System.IO.Stream stream, Encoding encoding) : base(stream, encoding) { }
        public void Write<T>(string format, T[] source) { base.Write(format, source.OfType<object>().ToArray()); }
        public void WriteLine<T>(string format, T[] source) { base.WriteLine(format, source.OfType<object>().ToArray()); }
    }
    public class StreamScanner
    {
        public StreamScanner(Stream stream) { str = stream; }
        public readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }
        private byte read()
        {
            if (isEof) return 0;
            if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } }
            return buf[ptr++];
        }
        public char Char() { byte b = 0; do b = read(); while ((b < 33 || 126 < b) && !isEof); return (char)b; }

        public string Scan()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public string ScanLine()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b != '\n'; b = (char)read())
                if (b == 0) break;
                else if (b != '\r') sb.Append(b);
            return sb.ToString();
        }
        public long Long()
        {
            if (isEof) return long.MinValue;
            long ret = 0; byte b = 0; var ng = false;
            do b = read();
            while (b != 0 && b != '-' && (b < '0' || '9' < b));
            if (b == 0) return long.MinValue;
            if (b == '-') { ng = true; b = read(); }
            for (; true; b = read())
            {
                if (b < '0' || '9' < b)
                    return ng ? -ret : ret;
                else ret = ret * 10 + b - '0';
            }
        }
        public int Integer() { return (isEof) ? int.MinValue : (int)Long(); }
        public double Double() { var s = Scan(); return s != "" ? double.Parse(s, CultureInfo.InvariantCulture) : double.NaN; }
        private T[] enumerate<T>(int n, Func<T> f)
        {
            var a = new T[n];
            for (int i = 0; i < n; ++i) a[i] = f();
            return a;
        }

        public char[] Char(int n) { return enumerate(n, Char); }
        public string[] Scan(int n) { return enumerate(n, Scan); }
        public double[] Double(int n) { return enumerate(n, Double); }
        public int[] Integer(int n) { return enumerate(n, Integer); }
        public long[] Long(int n) { return enumerate(n, Long); }
    }
}
#endregion

#region Manacher
static public partial class StringEx
{
    /// <summary>s[i]を中心とする最長回文の半径を求める．O(|S|)</summary>
    /// <returns>R[i]=iを中心とする最長回文の半径</returns>
    static public int[] Manacher(string s)
    {
        var R = new int[s.Length];
        int i = 0, j = 0;
        while (i < s.Length)
        {
            while (i - j >= 0 && i + j < s.Length && s[i - j] == s[i + j]) ++j;
            R[i] = j;
            int k = 1;
            while (i - k >= 0 && i + k < s.Length && k + R[i - k] < j) { R[i + k] = R[i - k]; ++k; }
            i += k; j -= k;
        }
        return R;
    }
    /// <summary>s[i]を中心とする最長回文の半径を(偶数長のものも含めて)求める．O(|S|)</summary>
    /// <returns>ret[i]=i/2を中心とする最長回文の半径．iが奇数のときは偶数長</returns>
    static public int[] ManacherWithEven(string s)
    {
        var sb = new System.Text.StringBuilder();
        foreach (var x in s)
        {
            sb.Append(x);
            sb.Append('$');
        }
        var t = sb.ToString();
        Debug.WriteLine(t);
        var ret = Manacher(t);
        for (int i = 1; i < ret.Length; i += 2) ret[i] = ret[i] / 2;
        var ret2 = Manacher(s);
        for (int i = 0; i < ret.Length; i += 2) ret[i] = ret2[i / 2];

        return ret;

    }


}
#endregion
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