結果

問題 No.470 Inverse S+T Problem
ユーザー 紙ぺーぱー紙ぺーぱー
提出日時 2016-12-20 00:33:56
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 25 ms / 2,000 ms
コード長 10,238 bytes
コンパイル時間 2,928 ms
コンパイル使用メモリ 120,068 KB
実行使用メモリ 25,948 KB
最終ジャッジ日時 2024-06-01 22:27:30
合計ジャッジ時間 3,242 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
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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 23 ms
25,820 KB
testcase_01 AC 23 ms
23,652 KB
testcase_02 AC 23 ms
25,560 KB
testcase_03 AC 23 ms
23,904 KB
testcase_04 AC 23 ms
23,652 KB
testcase_05 AC 23 ms
23,892 KB
testcase_06 AC 21 ms
23,776 KB
testcase_07 AC 20 ms
23,760 KB
testcase_08 AC 20 ms
23,628 KB
testcase_09 AC 23 ms
25,816 KB
testcase_10 AC 23 ms
23,652 KB
testcase_11 AC 23 ms
21,556 KB
testcase_12 AC 22 ms
23,648 KB
testcase_13 AC 22 ms
23,636 KB
testcase_14 AC 24 ms
25,944 KB
testcase_15 AC 23 ms
25,948 KB
testcase_16 AC 23 ms
23,648 KB
testcase_17 AC 24 ms
25,824 KB
testcase_18 AC 23 ms
21,812 KB
testcase_19 AC 22 ms
23,644 KB
testcase_20 AC 23 ms
23,772 KB
testcase_21 AC 24 ms
23,644 KB
testcase_22 AC 25 ms
23,908 KB
testcase_23 AC 24 ms
25,832 KB
testcase_24 AC 25 ms
25,692 KB
testcase_25 AC 23 ms
23,776 KB
testcase_26 AC 23 ms
24,108 KB
testcase_27 AC 23 ms
23,648 KB
testcase_28 AC 21 ms
23,520 KB
testcase_29 AC 22 ms
23,980 KB
testcase_30 AC 21 ms
25,552 KB
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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 n = sc.Integer();
            if (2 * n > 2756)
            {
                IO.Printer.Out.WriteLine("Impossible");
                return;
            }
            var s = sc.Scan(n);
            var scc = new SCCGraph(2 * n);

            for (int i = 0; i < n; i++)
                for (int j = i + 1; j < n; j++)
                {
                    var a = s[i].Substring(0, 1);
                    var bc = s[i].Substring(1);

                    var ab = s[i].Substring(0, 2);
                    var c = s[i].Substring(2, 1);

                    var A = s[j].Substring(0, 1);
                    var BC = s[j].Substring(1);

                    var AB = s[j].Substring(0, 2);
                    var C = s[j].Substring(2, 1);

                    //1 & 1 dame
                    if (a == A || bc == BC)
                    {
                        scc.AddEdge(i, n + j);
                        scc.AddEdge(j, n + i);
                    }
                    //0 & 0 dame
                    if (ab == AB || c == C)
                    {
                        scc.AddEdge(n + i, j);
                        scc.AddEdge(n + j, i);
                    }
                    //1 & 0 dame
                    if (a == C || bc == AB)
                    {
                        scc.AddEdge(i, j);
                        scc.AddEdge(n + j, n + i);
                    }
                    //0 & 1 dame
                    if (ab == BC || c == A)
                    {
                        scc.AddEdge(n + i, n + j);
                        scc.AddEdge(j, i);
                    }
                }
            scc.Build();
            for (int i = 0; i < n; i++)
                if (scc.IsSameGroup(i, n + i))
                {
                    IO.Printer.Out.WriteLine("Impossible");
                    return;
                }
            for (int i = 0; i < n; i++)
            {
                if (scc.group[i] < scc.group[i + n])
                    IO.Printer.Out.WriteLine($"{s[i][0]} {s[i][1]}{s[i][2]}");
                else IO.Printer.Out.WriteLine($"{s[i][0]}{s[i][1]} {s[i][2]}");

            }
        }
        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 SCCGraph
public class SCCGraph
{
    int n;

    List<int>[] g;

    /// <summary>
    /// 強連結成分内の集合
    /// </summary>
    public List<List<int>> scc;
    /// <summary>
    /// 元のグラフのインデックスから強連結成分分解後のインデックスへの写像
    /// </summary>
    public int[] group;

    /// <summary>
    /// 強連結成分のサイズ
    /// </summary>
    public int size;
    /// <summary>
    /// 強連結成分分解後のグラフ
    /// </summary>
    public List<int>[] G;
    /// <summary>
    /// 強連結成分分解後の自己ループの数
    /// </summary>
    public int[] L;

    public SCCGraph(int N)
    {
        n = N;
        g = new List<int>[n];
        scc = new List<List<int>>();
        for (int i = 0; i < n; i++)
        {
            g[i] = new List<int>();
        }
    }
    public void AddEdge(int f, int t)
    {
        g[f].Add(t);
    }

    /// <summary>
    /// 強連結成分をして，グラフを再構築する
    /// </summary>
    public void Build()
    {
        Decomposite();
        group = new int[n];
        L = new int[size];
        G = new List<int>[size];
        for (int i = 0; i < size; i++)
        {
            G[i] = new List<int>();
            foreach (var x in scc[i]) group[x] = i;
        }
        for (int i = 0; i < n; i++)
        {
            var u = group[i];
            foreach (var to in g[i])
            {
                var v = group[to];
                if (u == v) L[u]++;
                else G[u].Add(v);

            }

        }

    }
    /// <summary>
    /// 強連結成分分解をする
    /// </summary>
    public int Decomposite()
    {
        var S = new FastStack<int>(n + 2);
        var B = new FastStack<int>(n + 2);
        var I = new int[n];
        var iter = new int[n];
        var s = new FastStack<int>(n + 2);
        for (int i = 0; i < n; i++)
        {
            if (I[i] != 0) continue;
            Debug.WriteLine(i);
            s.Push(i);
            while (s.Any())
            {
                DFS:
                var u = s.Peek();
                if (I[u] == 0)
                {
                    B.Push(I[u] = S.Count);
                    S.Push(u);
                    iter[u] = 0;
                }
                while (iter[u] < g[u].Count)
                {
                    var v = g[u][iter[u]++];
                    if (I[v] == 0)
                    {
                        Debug.WriteLine(v);
                        s.Push(v);
                        goto DFS;
                    }
                    else while (I[v] < B.Peek()) B.Pop();
                }
                if (I[u] == B.Peek())
                {
                    var ns = new List<int>();
                    scc.Add(ns);
                    B.Pop();
                    while (I[u] < S.Count)
                    {
                        var p = S.Pop();
                        ns.Add(p);
                        I[p] = n + scc.Count;
                    }
                }
                s.Pop();

            }
        }
        return size = scc.Count;

    }
    public bool IsSameGroup(int u, int v) { return group[u] == group[v]; }
}
#endregion
#region Stack<T>
public class FastStack<T>
{
    T[] data;
    int ptr;
    public FastStack(int size) { data = new T[size]; }
    public void Push(T item) { data[ptr++] = item; }
    public T Pop() { return data[--ptr]; }
    public T Peek() { return data[ptr - 1]; }
    public bool Any() { return ptr != 0; }
    public T Last { get { return data[ptr - 1]; } set { data[ptr - 1] = value; } }
    public int Count { get { return ptr; } }
}
#endregion
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