結果

問題 No.238 Mr. K's Another Gift
ユーザー 紙ぺーぱー紙ぺーぱー
提出日時 2015-07-05 23:14:42
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 205 ms / 2,000 ms
コード長 5,857 bytes
コンパイル時間 3,545 ms
コンパイル使用メモリ 108,320 KB
実行使用メモリ 28,160 KB
最終ジャッジ日時 2023-09-22 07:13:54
合計ジャッジ時間 10,875 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge14
このコードへのチャレンジ（β）

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 54 ms
21,252 KB
testcase_01 AC 54 ms
23,308 KB
testcase_02 AC 54 ms
23,468 KB
testcase_03 AC 56 ms
23,440 KB
testcase_04 AC 63 ms
21,336 KB
testcase_05 AC 170 ms
25,244 KB
testcase_06 AC 137 ms
26,284 KB
testcase_07 AC 182 ms
26,136 KB
testcase_08 AC 181 ms
26,160 KB
testcase_09 AC 151 ms
24,228 KB
testcase_10 AC 56 ms
23,272 KB
testcase_11 AC 54 ms
21,348 KB
testcase_12 AC 54 ms
21,288 KB
testcase_13 AC 58 ms
19,396 KB
testcase_14 AC 144 ms
23,928 KB
testcase_15 AC 201 ms
25,724 KB
testcase_16 AC 205 ms
27,940 KB
testcase_17 AC 201 ms
27,764 KB
testcase_18 AC 200 ms
25,832 KB
testcase_19 AC 202 ms
26,020 KB
testcase_20 AC 54 ms
21,368 KB
testcase_21 AC 53 ms
21,248 KB
testcase_22 AC 54 ms
23,356 KB
testcase_23 AC 55 ms
21,444 KB
testcase_24 AC 59 ms
23,340 KB
testcase_25 AC 63 ms
21,656 KB
testcase_26 AC 137 ms
28,160 KB
testcase_27 AC 160 ms
26,224 KB
testcase_28 AC 71 ms
26,104 KB
testcase_29 AC 158 ms
26,084 KB
testcase_30 AC 53 ms
25,352 KB
testcase_31 AC 53 ms
21,204 KB
testcase_32 AC 55 ms
21,280 KB
testcase_33 AC 68 ms
21,288 KB
testcase_34 AC 190 ms
27,248 KB
testcase_35 AC 202 ms
25,744 KB
testcase_36 AC 201 ms
25,864 KB
testcase_37 AC 201 ms
25,720 KB
testcase_38 AC 203 ms
25,832 KB
testcase_39 AC 202 ms
26,104 KB
testcase_40 AC 55 ms
21,408 KB
testcase_41 AC 53 ms
21,232 KB
testcase_42 AC 53 ms
21,208 KB
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.Diagnostics;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using StringBuilder = System.Text.StringBuilder;
using System.Numerics;

namespace Program
{

    public class Solver
    {
        public void Solve()
        {
            var s = sc.Scan();
            var n = s.Length;
            const long mod = (long)1e9 + 7;
            var left = new long[n + 1];
            var right = new long[n + 1];
            var shift = new long[n + 1];
            shift[0] = 1;
            for (int i = 1; i <= n; i++)
                shift[i] = (shift[i - 1] * 26) % mod;
            for (int i = 0; i < n; i++)
                left[i + 1] = (left[i] * 26 + s[i] - 'a') % mod;
            for (int i = 0, j = n - 1; i < n; i++, j--)
                right[i + 1] = (right[i] + (s[j] - 'a') * shift[i]) % mod;
            var t = s.Reverse().AsString();
            var rev_left = new long[n + 1];
            var rev_right = new long[n + 1];
            for (int i = 0; i < n; i++)
                rev_left[i + 1] = (rev_left[i] * 26 + t[i] - 'a') % mod;
            for (int i = 0, j = n - 1; i < n; i++, j--)
                rev_right[i + 1] = (rev_right[i] + (t[j] - 'a') * shift[i]) % mod;
            for (int i = 0, j = n; i <= n; i++, j--)
            {
                for (int k = 0; k < 26; k++)
                {
                    var go = (left[i] * 26 + k) % mod;
                    go = (go * shift[j] + right[j]) % mod;
                    var rev = (rev_left[j] * 26 + k) % mod;
                    rev = (rev * shift[i] + rev_right[i]) % mod;
                    if (go == rev)
                    {
                        IO.Printer.Out.WriteLine(s.Substring(0, i) + (char)('a' + k) + s.Substring(i));
                        return;
                    }
                }
            }
            IO.Printer.Out.WriteLine("NA");

        }
        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 != '-' && (b < '0' || '9' < b));
            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() { return double.Parse(Scan(), CultureInfo.InvariantCulture); }
        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
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