結果

問題 No.3113 The farthest point
ユーザー KumaTachiRen
提出日時 2025-04-18 20:38:12
言語 C#
(.NET 8.0.404)
結果
AC  
実行時間 497 ms / 2,000 ms
コード長 7,991 bytes
コンパイル時間 7,821 ms
コンパイル使用メモリ 170,556 KB
実行使用メモリ 188,136 KB
最終ジャッジ日時 2025-04-18 20:38:32
合計ジャッジ時間 17,616 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 33
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
  復元対象のプロジェクトを決定しています...
  /home/judge/data/code/main.csproj を復元しました (99 ミリ秒)。
  main -> /home/judge/data/code/bin/Release/net8.0/main.dll
  main -> /home/judge/data/code/bin/Release/net8.0/publish/

ソースコード

diff # 

using Lib;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using static Lib.OutputLib;
public class Solver
{
    const bool MultiTestCase = false;
    void Solve()
    {
        int n = ri;
        var dp = new ReRootingDP<long, long, long>(
            n,
            0,
            (x, y) => Math.Max(x, y),
            (x, e) => Math.Max(0, x + e),
            (x, _) => x
        );
        for (int i = 0; i < n - 1; i++)
        {
            int u = ri - 1, v = ri - 1, w = ri;
            dp.AddEdge(u, v, w);
        }
        long ans = dp.Calc().Max();
        Write(ans);
    }

#pragma warning disable CS0162, CS8618
    public Solver() { if (!MultiTestCase) Solve(); else for (int t = ri; t > 0; t--) Solve(); }
#pragma warning restore CS0162, CS8618

    const int IINF = 1 << 30;
    const long INF = 1L << 60;
    int ri { [MethodImpl(256)] get => (int)sc.Integer(); }
    long rl { [MethodImpl(256)] get => sc.Integer(); }
    uint rui { [MethodImpl(256)] get => (uint)sc.UInteger(); }
    ulong rul { [MethodImpl(256)] get => sc.UInteger(); }
    double rd { [MethodImpl(256)] get => sc.Double(); }
    string rs { [MethodImpl(256)] get => sc.Scan(); }
    string rline { [MethodImpl(256)] get => sc.Line(); }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
    void ReadArray(out int[] a, int n) { a = new int[n]; for (int i = 0; i < a.Length; i++) a[i] = ri; }
    void ReadArray(out long[] a, int n) { a = new long[n]; for (int i = 0; i < a.Length; i++) a[i] = rl; }
    void ReadArray<T>(out T[] a, int n, Func<T> read) { a = new T[n]; for (int i = 0; i < a.Length; i++) a[i] = read(); }
    void ReadArray<T>(out T[] a, int n, Func<int, T> read) { a = new T[n]; for (int i = 0; i < a.Length; i++) a[i] = read(i); }
}

static class Program
{
    static public void Main(string[] args)
    {
        SourceExpander.Expander.Expand();
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        new Solver();
        Console.Out.Flush();
    }
}
#region Expanded by https://github.com/kzrnm/SourceExpander
namespace Lib{public class ReRootingDP<T,V,E>where T:struct{private readonly int n;private readonly T id;private readonly Func<T,T,T>op;private readonly Func<T,E,T>add_edge;private readonly Func<T,V,T>add_vertex;private readonly List<(int to,E data)>[]edges;private readonly V[]vertex_data;int edge_count=0;(int to,E data)[]csr;int[]csr_idx;T[]ans,dp;public T this[int i,int j]{get=>dp[GetDPIndex(i,j)];}public T this[int i]{get=>ans[i];}public ReRootingDP(int n,T id,Func<T,T,T>op,Func<T,E,T>add_edge,Func<T,V,T>add_vertex){this.n=n;this.id=id;this.op=op;this.add_edge=add_edge;this.add_vertex=add_vertex;edges=new List<(int,E)>[n];for(int i=0;i<n;i++)edges[i]=new List<(int,E)>();vertex_data=new V[n];}public void SetVertex(int u,V data)=>vertex_data[u]=data;public int AddEdge(int u,int v,E data){edges[u].Add((v,data));edges[v].Add((u,data));return edge_count++;}public int AddEdge(int u,int v,E data,E rdata){edges[u].Add((v,data));edges[v].Add((u,rdata));return edge_count++;}public void UnsafeDirectedAddEdge(int u,int v,E data)=>edges[u].Add((v,data));public T[]Calc(){CSRBuild();dp=new T[2*(n-1)];ans=new T[n];seen=new bool[n];for(int i=0;i<n;i++)if(!seen[i])DFS1(i);seen=new bool[n];for(int i=0;i<n;i++)if(!seen[i])DFS2(i);return(T[])ans.Clone();}bool[]seen;private void DFS1(int x,int p=-1){seen[x]=true;T val=id;for(int idx=csr_idx[x];idx<csr_idx[x+1];idx++){var(y,e)=csr[idx];if(y==p)continue;DFS1(y,x);val=op(val,add_edge(dp[GetDPIndex(y,x)],e));}if(p==-1)ans[x]=add_vertex(val,vertex_data[x]);else dp[GetDPIndex(x,p)]=add_vertex(val,vertex_data[x]);}private void DFS2(int x,int p=-1){seen[x]=true;int deg=csr_idx[x+1]-csr_idx[x];var dp_r=new T[deg+1];dp_r[deg]=id;for(int i=deg-1;i>=0;i--){var(y,e)=csr[csr_idx[x]+i];dp_r[i]=op(dp_r[i+1],add_edge(dp[GetDPIndex(y,x)],e));}if(p!=-1)ans[x]=add_vertex(dp_r[0],vertex_data[x]);T sum_l=id;for(int i=0;i<deg;i++){var(y,e)=csr[csr_idx[x]+i];if(y!=p){dp[GetDPIndex(x,y)]=add_vertex(op(sum_l,dp_r[i+1]),vertex_data[x]);DFS2(y,x);}sum_l=op(sum_l,add_edge(dp[GetDPIndex(y,x)],e));}}[MethodImpl(256)]private void CSRBuild(){csr_idx=new int[n+1];csr=new(int to,E data)[2*(n-1)];for(int x=0,z=0;x<n;x++){edges[x].Sort((p1,p2)=>p1.to-p2.to);for(int i=0;i<edges[x].Count;i++)csr[z++]=edges[x][i];csr_idx[x+1]=z;}}[MethodImpl(256)]private int GetDPIndex(int x,int y){int l=csr_idx[x],r=csr_idx[x+1];while(r-l>1){int m=(l+r)/2;if(csr[m].to<=y)l=m;else r=m;}return l;}}}
namespace Lib{public partial class StreamScanner{public StreamScanner(Stream stream){str=stream;}private readonly Stream str;private readonly byte[]buf=new byte[1024];private int len,ptr;public bool isEof=false;public bool IsEndOfStream{get{return isEof;}}[MethodImpl(256)]private byte Read(){if(isEof)throw new EndOfStreamException();if(ptr>=len){ptr=0;if((len=str.Read(buf,0,1024))<=0){isEof=true;return 0;}}return buf[ptr++];}[MethodImpl(256)]public char Char(){byte b;do b=Read();while(b<33||126<b);return(char)b;}[MethodImpl(256)]public string Line(){var sb=new StringBuilder();for(var b=Char();b!=10&&!isEof;b=(char)Read())sb.Append(b);return sb.ToString();}[MethodImpl(256)]public string Scan(){var sb=new StringBuilder();for(var b=Char();b>=33&&b<=126;b=(char)Read())sb.Append(b);return sb.ToString();}[MethodImpl(256)]public long Integer(){long ret=0;var ng=false;byte b;do b=Read();while(b!='-'&&(b<'0'||'9'<b));if(b=='-'){ng=true;b=Read();}for(;'0'<=b&&b<='9';b=Read())ret=ret*10+(b^'0');return ng?-ret:ret;}[MethodImpl(256)]public ulong UInteger(){ulong ret=0;byte b;do b=Read();while(b<'0'||'9'<b);for(;'0'<=b&&b<='9';b=Read())ret=ret*10+(ulong)(b^'0');return ret;}[MethodImpl(256)]public double Double()=>double.Parse(Scan());}}
namespace Lib{public static class OutputLib{[MethodImpl(256)]public static void WriteJoin<T>(string s,IEnumerable<T>t)=>Console.WriteLine(string.Join(s,t));[MethodImpl(256)]public static void WriteMat<T>(T[,]a,string sep=" "){int sz1=a.GetLength(0),sz2=a.GetLength(1);var b=new T[sz2];for(int i=0;i<sz1;i++){for(int j=0;j<sz2;j++)b[j]=a[i,j];WriteJoin(sep,b);}}[MethodImpl(256)]public static void WriteMat<T>(T[][]a,string sep=" "){foreach(var ar in a)WriteJoin(sep,ar);}[MethodImpl(256)]public static void WriteMat<T>(T[][]a,Func<T,string>map,string sep=" "){foreach(var ar in a)WriteJoin(sep,ar.Select(x=>map(x)));}[MethodImpl(256)]public static void Write(object t)=>Console.WriteLine(t.ToString());[MethodImpl(256)]public static void Write(params object[]arg)=>Console.WriteLine(string.Join(" ",arg.Select(x=>x.ToString())));[MethodImpl(256)]public static void Write(string str)=>Console.WriteLine(str);[MethodImpl(256)]public static void WriteFlush(object t){Console.WriteLine(t.ToString());Console.Out.Flush();}[MethodImpl(256)]public static void WriteError(object t)=>Console.Error.WriteLine(t.ToString());[MethodImpl(256)]public static void Flush()=>Console.Out.Flush();[MethodImpl(256)]public static void YN(bool t)=>Console.WriteLine(t?"YES":"NO");[MethodImpl(256)]public static void Yn(bool t)=>Console.WriteLine(t?"Yes":"No");[MethodImpl(256)]public static void yn(bool t)=>Console.WriteLine(t?"yes":"no");[MethodImpl(256)]public static void DeleteLine()=>Console.Write("\x1b[1A\x1b[2K");[MethodImpl(256)]public static void ProgressBar(long now,long total,int blocks=50){int x=(int)((2*now*blocks+1)/(2*total));Console.Write($"\x1b[G[\x1b[42m{string.Concat(Enumerable.Repeat("_",x))}\x1b[0m{string.Concat(Enumerable.Repeat("_",blocks-x))}] : {now} / {total}");}}}
namespace SourceExpander{public class Expander{[Conditional("EXP")]public static void Expand(string inputFilePath=null,string outputFilePath=null,bool ignoreAnyError=true){}public static string ExpandString(string inputFilePath=null,bool ignoreAnyError=true){return "";}}}
#endregion Expanded by https://github.com/kzrnm/SourceExpander
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