結果
問題 | No.196 典型DP (1) |
ユーザー | 紙ぺーぱー |
提出日時 | 2015-04-26 22:56:29 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 198 ms / 2,000 ms |
コード長 | 6,290 bytes |
コンパイル時間 | 2,754 ms |
コンパイル使用メモリ | 113,576 KB |
実行使用メモリ | 53,500 KB |
最終ジャッジ日時 | 2023-09-18 12:22:23 |
合計ジャッジ時間 | 9,810 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge13 |
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 | 51 ms
20,388 KB |
testcase_01 | AC | 52 ms
20,384 KB |
testcase_02 | AC | 52 ms
20,428 KB |
testcase_03 | AC | 51 ms
20,480 KB |
testcase_04 | AC | 51 ms
20,436 KB |
testcase_05 | AC | 52 ms
20,392 KB |
testcase_06 | AC | 51 ms
20,336 KB |
testcase_07 | AC | 51 ms
20,424 KB |
testcase_08 | AC | 51 ms
20,320 KB |
testcase_09 | AC | 52 ms
20,388 KB |
testcase_10 | AC | 52 ms
20,428 KB |
testcase_11 | AC | 52 ms
20,404 KB |
testcase_12 | AC | 52 ms
22,564 KB |
testcase_13 | AC | 52 ms
20,440 KB |
testcase_14 | AC | 53 ms
20,528 KB |
testcase_15 | AC | 58 ms
20,944 KB |
testcase_16 | AC | 70 ms
23,144 KB |
testcase_17 | AC | 94 ms
30,444 KB |
testcase_18 | AC | 128 ms
34,944 KB |
testcase_19 | AC | 149 ms
40,492 KB |
testcase_20 | AC | 195 ms
51,380 KB |
testcase_21 | AC | 197 ms
50,868 KB |
testcase_22 | AC | 195 ms
52,844 KB |
testcase_23 | AC | 193 ms
50,904 KB |
testcase_24 | AC | 194 ms
50,912 KB |
testcase_25 | AC | 193 ms
50,872 KB |
testcase_26 | AC | 183 ms
51,384 KB |
testcase_27 | AC | 182 ms
53,400 KB |
testcase_28 | AC | 183 ms
50,856 KB |
testcase_29 | AC | 182 ms
53,372 KB |
testcase_30 | AC | 183 ms
53,500 KB |
testcase_31 | AC | 198 ms
49,176 KB |
testcase_32 | AC | 197 ms
50,712 KB |
testcase_33 | AC | 197 ms
52,856 KB |
testcase_34 | AC | 196 ms
50,776 KB |
testcase_35 | AC | 197 ms
52,772 KB |
testcase_36 | AC | 196 ms
47,156 KB |
testcase_37 | AC | 196 ms
50,748 KB |
testcase_38 | AC | 196 ms
50,732 KB |
testcase_39 | AC | 197 ms
49,200 KB |
testcase_40 | AC | 197 ms
52,708 KB |
testcase_41 | AC | 50 ms
18,424 KB |
testcase_42 | AC | 52 ms
22,376 KB |
testcase_43 | AC | 52 ms
20,512 KB |
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
using System; using System.Linq; 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 n = sc.Integer(); var k = sc.Integer(); var G = Enumerate(n, x => new List<int>()); for (int i = 0; i < n - 1; i++) { var a = sc.Integer(); var b = sc.Integer(); G[a].Add(b); G[b].Add(a); } var size = new int[n]; Func<int, int, int> dfs = null; dfs = (prev, cur) => { var s = 1; foreach (var to in G[cur]) if (to != prev) s += dfs(cur, to); return size[cur] = s; }; dfs(-1, 0); var cnt = new ModInteger[n + 1, n + 1]; Action<int, int> rec = null; rec = (prev, cur) => { var sz = size[cur]; cnt[cur, 0] = 1; cnt[cur, sz] = 1; var max = 0; foreach (var to in G[cur]) { if (prev == to) continue; rec(cur, to); for (int i = max; i >= 0; i--) { for (int j = 1; j <= size[to]; j++) { cnt[cur, i + j] += cnt[cur, i] * cnt[to, j]; max = Math.Max(max, i + j); } } } }; rec(-1, 0); IO.Printer.Out.WriteLine(cnt[0, k]); } 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 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, IEnumerable<T> source) { base.Write(format, source.OfType<object>().ToArray()); } public void WriteLine<T>(string format, IEnumerable<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); 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 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); } } } 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 ModNumber public partial struct ModInteger { public const long Mod = (long)1e9 + 7; public long num; public ModInteger(long n) : this() { num = n % Mod; } public override string ToString() { return num.ToString(); } public static ModInteger operator +(ModInteger l, ModInteger r) { var n = l.num + r.num; if (n >= Mod)n -= Mod; return new ModInteger(n); } public static ModInteger operator -(ModInteger l, ModInteger r) { var n = l.num - r.num; if (n < 0)n += Mod; return new ModInteger(n); } public static ModInteger operator *(ModInteger l, ModInteger r) { return new ModInteger((l.num * r.num) % Mod); } public static implicit operator ModInteger(long n) { return new ModInteger(n); } } #endregion