結果
問題 | No.827 総神童数 |
ユーザー | fgwiebfaoish |
提出日時 | 2020-06-12 18:40:58 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 637 ms / 2,000 ms |
コード長 | 4,382 bytes |
コンパイル時間 | 3,247 ms |
コンパイル使用メモリ | 110,112 KB |
実行使用メモリ | 59,852 KB |
最終ジャッジ日時 | 2023-09-06 09:24:22 |
合計ジャッジ時間 | 18,593 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge14 |
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 | 65 ms
20,840 KB |
testcase_01 | AC | 64 ms
20,912 KB |
testcase_02 | AC | 62 ms
18,888 KB |
testcase_03 | AC | 62 ms
18,816 KB |
testcase_04 | AC | 64 ms
22,744 KB |
testcase_05 | AC | 64 ms
20,752 KB |
testcase_06 | AC | 65 ms
20,896 KB |
testcase_07 | AC | 62 ms
20,692 KB |
testcase_08 | AC | 65 ms
20,784 KB |
testcase_09 | AC | 637 ms
59,852 KB |
testcase_10 | AC | 236 ms
35,380 KB |
testcase_11 | AC | 73 ms
21,448 KB |
testcase_12 | AC | 137 ms
32,020 KB |
testcase_13 | AC | 506 ms
53,180 KB |
testcase_14 | AC | 82 ms
24,096 KB |
testcase_15 | AC | 223 ms
37,276 KB |
testcase_16 | AC | 474 ms
45,684 KB |
testcase_17 | AC | 570 ms
53,544 KB |
testcase_18 | AC | 262 ms
39,988 KB |
testcase_19 | AC | 560 ms
49,096 KB |
testcase_20 | AC | 414 ms
42,284 KB |
testcase_21 | AC | 298 ms
39,628 KB |
testcase_22 | AC | 450 ms
46,048 KB |
testcase_23 | AC | 65 ms
20,900 KB |
testcase_24 | AC | 497 ms
48,400 KB |
testcase_25 | AC | 364 ms
40,836 KB |
testcase_26 | AC | 520 ms
48,588 KB |
testcase_27 | AC | 344 ms
41,004 KB |
testcase_28 | AC | 317 ms
38,868 KB |
testcase_29 | AC | 260 ms
33,772 KB |
testcase_30 | AC | 114 ms
30,604 KB |
testcase_31 | AC | 216 ms
35,376 KB |
testcase_32 | AC | 205 ms
32,928 KB |
testcase_33 | AC | 539 ms
48,416 KB |
testcase_34 | AC | 497 ms
46,344 KB |
testcase_35 | AC | 216 ms
35,528 KB |
testcase_36 | AC | 292 ms
37,304 KB |
testcase_37 | AC | 361 ms
42,868 KB |
testcase_38 | AC | 525 ms
48,232 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.Collections.Generic; using System.Collections; using System.Collections.Specialized; using System.Linq; using System.Text; using System.IO; using System.Reflection; using static System.Math; using System.Numerics; static class Program{ const int mod=(int)1e9+7; static List<int>[] li; static bool[] b; static int[] f; static void Main(){ Sc sc=new Sc(); var s=sc.Ia; int n=s[0],m=n-1; li=new List<int>[n+1]; b=new bool[n+1]; f=new int[n+1]; for(int i=1;i<=n;i++){li[i]=new List<int>();} for(int i=0;i<m;i++){ var e=sc.Ia; li[e[0]].Add(e[1]); li[e[1]].Add(e[0]); } Cb r=new Cb(n+1); Fu(1,1); Mint ans=0; for(int i = 1;i<=n&&f[i]!=0;i++) { Mint p=r.C1(n,i); p*=r.r[i-1]; p*=r.r[n-i]; p*=f[i]; ans+=p; } Console.WriteLine("{0}",ans); } static void Fu(int a,int g){ b[a]=true; f[g]++; for(int i=0;i<li[a].Count;i++){ if(!b[li[a][i]]){Fu(li[a][i],g+1);} } } } public class Cb{ private const int mod=(int)1e9+7; public long[] r; public Cb(int n){ r=new long[n]; r[0]=1; for(int i=1;i<n;i++){r[i]=(r[i-1]*i)%mod;} } public long C1(long n,long k){return (r[n]*Mi(r[k]*r[n-k]))%mod;} public long C2(long n,long k){ long l=1; n%=mod; for(int i=1;i<=k;i++){l=(l*(n-i+1))%mod;l=(l*Mi(i))%mod;} return l; } public long P1(long n,long k){return n<k?0:(r[n]*Mi(r[n-k]))%mod;} public long Mi(long a){ a=(a+mod)%mod; long b=mod,u=1,v=0; while(b>0){long t=a/b;a-=t*b;a^=b;b^=a;a^=b;u-=t*v;u^=v;v^=u;u^=v;} u%=mod; if(u<0){u+=mod;} return u%mod; } } public struct Mint{ const int mod=(int)1e9+7; private long d; public Mint(long d){this.d=d;} public static implicit operator Mint(long d){return new Mint(d%mod);} public static explicit operator long(Mint d){return d.d;} public override string ToString(){return d.ToString();} public static Mint operator+(Mint a,long b){a.d=(a.d+b)%mod;return a;} public static Mint operator+(Mint a,Mint b){a.d=(a.d+b.d)%mod;return a;} public static Mint operator-(Mint a,long b){a.d=(mod+a.d-b)%mod;return a;} public static Mint operator-(Mint a,Mint b){a.d=(mod+a.d-b.d)%mod;return a;} public static Mint operator*(Mint a,long b){a.d=(a.d*b)%mod;return a;} public static Mint operator*(Mint a,Mint b){a.d=(a.d*b.d)%mod;return a;} public static Mint operator/(Mint a,long b){a.d=(a.d*Mi(b))%mod;return a;} public static Mint operator/(Mint a,Mint b){a.d=(a.d*Mi(b.d))%mod;return a;} private static long Mi(long a){ a=(a+mod)%mod; long b=mod,u=1,v=0; while(b>0){ long t=a/b; a-=t*b;a^=b;b^=a;a^=b; u-=t*v;u^=v;v^=u;u^=v; } u%=mod; if(u<0){u+=mod;} return u%mod; } } public class Sc{ public int I{get{return int.Parse(Console.ReadLine());}} public long L{get{return long.Parse(Console.ReadLine());}} public double D{get{return double.Parse(Console.ReadLine());}} public string S{get{return Console.ReadLine();}} public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}} public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}} public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}} public string[] Sa{get{return Console.ReadLine().Split();}} public object[] Oa{get{return Console.ReadLine().Split();}} public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}} public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);} public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}} public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);} public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}} public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);} public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;} public T[] Arr<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;} public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;} public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;} }