結果
| 問題 |
No.1103 Directed Length Sum
|
| コンテスト | |
| ユーザー |
👑  terry_u16
|
| 提出日時 | 2020-07-03 23:44:27 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 2,301 ms / 3,000 ms |
| コード長 | 12,357 bytes |
| コンパイル時間 | 1,236 ms |
| コンパイル使用メモリ | 121,892 KB |
| 実行使用メモリ | 321,068 KB |
| 最終ジャッジ日時 | 2024-09-17 05:06:11 |
| 合計ジャッジ時間 | 20,907 ms |
|
ジャッジサーバーID （参考情報） |
judge3 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 22 |
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.IO;
using System.Linq;
using System.Text;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using YukicoderContest255.Extensions;
using YukicoderContest255.Questions;
namespace YukicoderContest255.Questions
{
public class QuestionC : AtCoderQuestionBase
{
BasicGraph tree;
public override IEnumerable<object> Solve(TextReader inputStream)
{
var nodes = inputStream.ReadInt();
tree = new BasicGraph(nodes);
var isRoot = Enumerable.Repeat(true, nodes).ToArray();
for (int i = 0; i < nodes - 1; i++)
{
var (a, b) = inputStream.ReadValue<int, int>();
a--;
b--;
tree.AddEdge(new BasicEdge(a, b));
isRoot[b] = false;
}
var root = -1;
for (int i = 0; i < isRoot.Length; i++)
{
if (isRoot[i])
{
root = i;
break;
}
}
yield return Dfs(root, 0, 0) % 1000000007;
}
long Dfs(int node, int parents, long sum)
{
sum += parents;
long childrenSum = 0;
foreach (var edge in tree[node])
{
childrenSum += Dfs(edge.To.Index, parents + 1, sum);
}
return sum + childrenSum;
}
public interface INode
{
public int Index { get; }
}
public interface IEdge<TNode> where TNode : INode
{
TNode From { get; }
TNode To { get; }
}
public interface IWeightedEdge<TNode> : IEdge<TNode> where TNode : INode
{
long Weight { get; }
}
public interface IGraph<TNode, TEdge> where TEdge : IEdge<TNode> where TNode : INode
{
IEnumerable<TEdge> this[TNode node] { get; }
IEnumerable<TEdge> Edges { get; }
IEnumerable<TNode> Nodes { get; }
int NodeCount { get; }
}
public interface IWeightedGraph<TNode, TEdge> : IGraph<TNode, TEdge> where TEdge : IWeightedEdge<TNode> where TNode : INode { }
[StructLayout(LayoutKind.Auto)]
public readonly struct BasicNode : INode, IEquatable<BasicNode>
{
public int Index { get; }
public BasicNode(int index)
{
Index = index;
}
public override string ToString() => Index.ToString();
public override bool Equals(object obj) => obj is BasicNode node && Equals(node);
public bool Equals(BasicNode other) => Index == other.Index;
public override int GetHashCode() => HashCode.Combine(Index);
public static bool operator ==(BasicNode left, BasicNode right) => left.Equals(right);
public static bool operator !=(BasicNode left, BasicNode right) => !(left == right);
public static implicit operator BasicNode(int value) => new BasicNode(value);
}
[StructLayout(LayoutKind.Auto)]
public readonly struct BasicEdge : IEdge<BasicNode>
{
public BasicNode From { get; }
public BasicNode To { get; }
public BasicEdge(int from, int to)
{
From = from;
To = to;
}
public override string ToString() => $"{From}-->{To}";
}
[StructLayout(LayoutKind.Auto)]
public readonly struct WeightedEdge : IWeightedEdge<BasicNode>
{
public BasicNode From { get; }
public BasicNode To { get; }
public long Weight { get; }
public WeightedEdge(int from, int to) : this(from, to, 1) { }
public WeightedEdge(int from, int to, long weight)
{
From = from;
To = to;
Weight = weight;
}
public override string ToString() => $"{From}--[{Weight}]-->{To}";
}
public class BasicGraph : IGraph<BasicNode, BasicEdge>
{
private readonly List<BasicEdge>[] _edges;
public IEnumerable<BasicEdge> this[BasicNode node] => _edges[node.Index];
public IEnumerable<BasicEdge> Edges => Nodes.SelectMany(node => this[node]);
public IEnumerable<BasicNode> Nodes => Enumerable.Range(0, NodeCount).Select(i => new BasicNode(i));
public int NodeCount { get; }
public BasicGraph(int nodeCount) : this(nodeCount, Enumerable.Empty<BasicEdge>()) { }
public BasicGraph(int nodeCount, IEnumerable<BasicEdge> edges)
{
_edges = Enumerable.Repeat(0, nodeCount).Select(_ => new List<BasicEdge>()).ToArray();
NodeCount = nodeCount;
foreach (var edge in edges)
{
AddEdge(edge);
}
}
public BasicGraph(int nodeCount, IEnumerable<IEnumerable<int>> distances)
{
_edges = new List<BasicEdge>[nodeCount];
int i = 0;
foreach (var row in distances)
{
_edges[i] = new List<BasicEdge>(nodeCount);
int j = 0;
foreach (var distance in row)
{
if (distance == 1)
{
_edges[i].Add(new BasicEdge(i, j++));
}
}
i++;
}
}
public void AddEdge(BasicEdge edge) => _edges[edge.From.Index].Add(edge);
}
}
}
namespace YukicoderContest255
{
class Program
{
static void Main(string[] args)
{
IAtCoderQuestion question = new QuestionC();
var answers = question.Solve(Console.In);
var writer = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
Console.SetOut(writer);
foreach (var answer in answers)
{
Console.WriteLine(answer);
}
Console.Out.Flush();
}
}
}
#region Base Class
namespace YukicoderContest255.Questions
{
public interface IAtCoderQuestion
{
IEnumerable<object> Solve(string input);
IEnumerable<object> Solve(TextReader inputStream);
}
public abstract class AtCoderQuestionBase : IAtCoderQuestion
{
public IEnumerable<object> Solve(string input)
{
var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
var reader = new StreamReader(stream, Encoding.Unicode);
return Solve(reader);
}
public abstract IEnumerable<object> Solve(TextReader inputStream);
}
}
#endregion
#region Extensions
namespace YukicoderContest255.Extensions
{
public static class TextReaderExtensions
{
public static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
public static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
public static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
public static string ReadString(this TextReader reader) => reader.ReadLine();
public static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
public static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
public static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
public static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
// Supports primitive type only.
public static T1 ReadValue<T1>(this TextReader reader) => (T1)Convert.ChangeType(reader.ReadLine(), typeof(T1));
public static (T1, T2) ReadValue<T1, T2>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
return (v1, v2);
}
public static (T1, T2, T3) ReadValue<T1, T2, T3>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
return (v1, v2, v3);
}
public static (T1, T2, T3, T4) ReadValue<T1, T2, T3, T4>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
return (v1, v2, v3, v4);
}
public static (T1, T2, T3, T4, T5) ReadValue<T1, T2, T3, T4, T5>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
return (v1, v2, v3, v4, v5);
}
public static (T1, T2, T3, T4, T5, T6) ReadValue<T1, T2, T3, T4, T5, T6>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
return (v1, v2, v3, v4, v5, v6);
}
public static (T1, T2, T3, T4, T5, T6, T7) ReadValue<T1, T2, T3, T4, T5, T6, T7>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7));
return (v1, v2, v3, v4, v5, v6, v7);
}
public static (T1, T2, T3, T4, T5, T6, T7, T8) ReadValue<T1, T2, T3, T4, T5, T6, T7, T8>(this TextReader reader, char separator = ' ')
{
var inputs = ReadStringArray(reader, separator);
var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1));
var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2));
var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3));
var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4));
var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5));
var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6));
var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7));
var v8 = (T8)Convert.ChangeType(inputs[7], typeof(T8));
return (v1, v2, v3, v4, v5, v6, v7, v8);
}
}
}
#endregion