結果

問題 No.196 典型DP (1)
ユーザー りあんりあん
提出日時 2019-01-13 16:13:41
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 101 ms / 2,000 ms
コード長 6,989 bytes
コンパイル時間 1,349 ms
コンパイル使用メモリ 123,680 KB
実行使用メモリ 36,096 KB
最終ジャッジ日時 2024-06-07 16:35:28
合計ジャッジ時間 4,934 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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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 25 ms
18,048 KB
testcase_01 AC 25 ms
17,920 KB
testcase_02 AC 26 ms
18,048 KB
testcase_03 AC 25 ms
18,048 KB
testcase_04 AC 26 ms
17,920 KB
testcase_05 AC 26 ms
17,920 KB
testcase_06 AC 24 ms
17,920 KB
testcase_07 AC 25 ms
18,048 KB
testcase_08 AC 25 ms
18,176 KB
testcase_09 AC 28 ms
18,176 KB
testcase_10 AC 25 ms
18,048 KB
testcase_11 AC 26 ms
17,920 KB
testcase_12 AC 26 ms
18,176 KB
testcase_13 AC 27 ms
18,304 KB
testcase_14 AC 26 ms
18,176 KB
testcase_15 AC 28 ms
18,432 KB
testcase_16 AC 31 ms
18,560 KB
testcase_17 AC 36 ms
18,816 KB
testcase_18 AC 45 ms
19,456 KB
testcase_19 AC 50 ms
19,584 KB
testcase_20 AC 57 ms
19,584 KB
testcase_21 AC 58 ms
19,840 KB
testcase_22 AC 57 ms
19,584 KB
testcase_23 AC 74 ms
24,576 KB
testcase_24 AC 69 ms
23,424 KB
testcase_25 AC 67 ms
23,168 KB
testcase_26 AC 99 ms
35,840 KB
testcase_27 AC 98 ms
35,840 KB
testcase_28 AC 96 ms
36,096 KB
testcase_29 AC 96 ms
35,840 KB
testcase_30 AC 97 ms
35,968 KB
testcase_31 AC 98 ms
35,584 KB
testcase_32 AC 99 ms
35,584 KB
testcase_33 AC 98 ms
35,456 KB
testcase_34 AC 99 ms
35,712 KB
testcase_35 AC 101 ms
35,584 KB
testcase_36 AC 94 ms
34,304 KB
testcase_37 AC 56 ms
20,480 KB
testcase_38 AC 94 ms
34,560 KB
testcase_39 AC 88 ms
31,232 KB
testcase_40 AC 97 ms
35,200 KB
testcase_41 AC 26 ms
18,048 KB
testcase_42 AC 26 ms
18,048 KB
testcase_43 AC 26 ms
18,048 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.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.IO;
using System.Text;

using static util;
using P = pair<int, int>;

using Binary = System.Func<System.Linq.Expressions.ParameterExpression, System.Linq.Expressions.ParameterExpression,
                           System.Linq.Expressions.BinaryExpression>;
using Unary = System.Func<System.Linq.Expressions.ParameterExpression, System.Linq.Expressions.UnaryExpression>;

class Program
{
    static StreamWriter sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
    static Scan sc = new Scan();
    const int M = 1000000007;
    const int M2 = 998244353;
    const long LM = (long)1e18;
    const double eps = 1e-11;
    static readonly int[] dd = { 0, 1, 0, -1, 0 };
    const string dstring = "RDLU";
    static void Main()
    {
        int n, k;
        sc.Multi(out n, out k);
        edge = new List<int>[n];
        for (int i = 0; i < n; i++)
            edge[i] = new List<int>();

        for (int i = 0; i < n - 1; i++)
        {
            int u, v;
            sc.Multi(out u, out v);
            edge[u].Add(v);
            edge[v].Add(u);
        }
        Prt(dfs(0, -1)[k]);
        sw.Flush();
    }
    static List<int>[] edge;
    static long[] dfs(int p, int par) {
        var dp = new long[2];
        dp[0] = 1;
        foreach (var item in edge[p])
        {
            if (item == par) continue;
            var a = dfs(item, p);
            var nex = new long[dp.Length + a.Length - 1];
            for (int i = 0; i < dp.Length; i++)
                for (int j = 0; j < a.Length; j++)
                    nex[i + j] = (nex[i + j] + dp[i] * a[j]) % M;

            dp = nex;
        }
        dp[dp.Length - 1] = 1;
        return dp;
    }

    static void DBG(string a) => Console.WriteLine(a);
    static void DBG<T>(IEnumerable<T> a) => DBG(string.Join(" ", a));
    static void DBG(params object[] a) => DBG(string.Join(" ", a));
    static void Prt(string a) => sw.WriteLine(a);
    static void Prt<T>(IEnumerable<T> a) => Prt(string.Join(" ", a));
    static void Prt(params object[] a) => Prt(string.Join(" ", a));
}
class pair<T, U> : IComparable<pair<T, U>>
{
    public T v1;
    public U v2;
    public pair(T v1, U v2) {
        this.v1 = v1;
        this.v2 = v2;
    }
    public int CompareTo(pair<T, U> a) {
        int c = Comparer<T>.Default.Compare(v1, a.v1);
        return c != 0 ? c : Comparer<U>.Default.Compare(v2, a.v2);
    }
    public override string ToString() => v1 + " " + v2;
    public void Deconstruct(out T a, out U b) {
        a = v1; b = v2;
    }
    public static bool operator>(pair<T, U> a, pair<T, U> b) => a.CompareTo(b) > 0;
    public static bool operator<(pair<T, U> a, pair<T, U> b) => a.CompareTo(b) < 0;
    public static bool operator>=(pair<T, U> a, pair<T, U> b) => a.CompareTo(b) >= 0;
    public static bool operator<=(pair<T, U> a, pair<T, U> b) => a.CompareTo(b) <= 0;
}
static class util
{
    public static pair<T, U> make_pair<T, U>(T v1, U v2) => new pair<T, U>(v1, v2);
    public static T sq<T>(T a) => Operator<T>.Multiply(a, a);
    public static T Max<T>(params T[] a) => a.Max();
    public static T Min<T>(params T[] a) => a.Min();
    public static bool inside(int i, int j, int h, int w) => i >= 0 && i < h && j >= 0 && j < w;
    public static Dictionary<T, int> compress<T>(this IEnumerable<T> a)
        => a.Distinct().OrderBy(v => v).Select((v, i) => new { v, i }).ToDictionary(p => p.v, p => p.i);
    public static Dictionary<T, int> compress<T>(params IEnumerable<T>[] a) => compress(a.Aggregate(Enumerable.Union));
    public static void swap<T>(ref T a, ref T b) where T : struct { var t = a; a = b; b = t; }
    public static void swap<T>(this IList<T> a, int i, int j) where T : struct { var t = a[i]; a[i] = a[j]; a[j] = t; }
    public static T[] copy<T>(this IList<T> a) {
        var ret = new T[a.Count];
        for (int i = 0; i < a.Count; i++) ret[i] = a[i];
        return ret;
    }
}
static class Operator<T>
{
    static readonly ParameterExpression x = Expression.Parameter(typeof(T), "x");
    static readonly ParameterExpression y = Expression.Parameter(typeof(T), "y");
    public static readonly Func<T, T, T> Add = Lambda(Expression.Add);
    public static readonly Func<T, T, T> Subtract = Lambda(Expression.Subtract);
    public static readonly Func<T, T, T> Multiply = Lambda(Expression.Multiply);
    public static readonly Func<T, T, T> Divide = Lambda(Expression.Divide);
    public static readonly Func<T, T> Plus = Lambda(Expression.UnaryPlus);
    public static readonly Func<T, T> Negate = Lambda(Expression.Negate);
    public static Func<T, T, T> Lambda(Binary op) => Expression.Lambda<Func<T, T, T>>(op(x, y), x, y).Compile();
    public static Func<T, T> Lambda(Unary op) => Expression.Lambda<Func<T, T>>(op(x), x).Compile();
}

class Scan
{
    public int Int => int.Parse(Str);
    public long Long => long.Parse(Str);
    public double Double => double.Parse(Str);
    public string Str => Console.ReadLine().Trim();
    public pair<T, U> Pair<T, U>() {
        T a; U b;
        Multi(out a, out b);
        return new pair<T, U>(a, b);
    }
    public P P {
        get {
            int a, b;
            Multi(out a, out b);
            return new P(a, b);
        }
    }
    public int[] IntArr => StrArr.Select(int.Parse).ToArray();
    public long[] LongArr => StrArr.Select(long.Parse).ToArray();
    public double[] DoubleArr => StrArr.Select(double.Parse).ToArray();
    public string[] StrArr => Str.Split(new[]{' '}, StringSplitOptions.RemoveEmptyEntries);
    bool eq<T, U>() => typeof(T).Equals(typeof(U));
    T ct<T, U>(U a) => (T)Convert.ChangeType(a, typeof(T));
    T cv<T>(string s) => eq<T, int>()    ? ct<T, int>(int.Parse(s))
                       : eq<T, long>()   ? ct<T, long>(long.Parse(s))
                       : eq<T, double>() ? ct<T, double>(double.Parse(s))
                       : eq<T, char>()   ? ct<T, char>(s[0])
                                         : ct<T, string>(s);
    public void Multi<T>(out T a) => a = cv<T>(Str);
    public void Multi<T, U>(out T a, out U b)
    { var ar = StrArr; a = cv<T>(ar[0]); b = cv<U>(ar[1]); }
    public void Multi<T, U, V>(out T a, out U b, out V c)
    { var ar = StrArr; a = cv<T>(ar[0]); b = cv<U>(ar[1]); c = cv<V>(ar[2]); }
    public void Multi<T, U, V, W>(out T a, out U b, out V c, out W d)
    { var ar = StrArr; a = cv<T>(ar[0]); b = cv<U>(ar[1]); c = cv<V>(ar[2]); d = cv<W>(ar[3]); }
    public void Multi<T, U, V, W, X>(out T a, out U b, out V c, out W d, out X e)
    { var ar = StrArr; a = cv<T>(ar[0]); b = cv<U>(ar[1]); c = cv<V>(ar[2]); d = cv<W>(ar[3]); e = cv<X>(ar[4]); }
    public void Multi<T, U, V, W, X, Y>(out T a, out U b, out V c, out W d, out X e, out Y f)
    { var ar = StrArr; a = cv<T>(ar[0]); b = cv<U>(ar[1]); c = cv<V>(ar[2]); d = cv<W>(ar[3]); e = cv<X>(ar[4]); f = cv<Y>(ar[5]); }
}
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