結果

問題 No.778 クリスマスツリー
ユーザー ひばち
提出日時 2019-08-22 01:34:10
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 316 ms / 2,000 ms
コード長 6,385 bytes
コンパイル時間 2,292 ms
コンパイル使用メモリ 117,976 KB
実行使用メモリ 87,532 KB
最終ジャッジ日時 2024-10-14 02:00:39
合計ジャッジ時間 4,418 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
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 12
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
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 #
プレゼンテーションモードにする

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using static System.Console;
using static System.Convert;
using static System.Math;
//using static System.Globalization.CultureInfo;
using System.Text;
class Program
{
private static void chmin<T>(ref T num, T val) where T : IComparable<T>
=> num = num.CompareTo(val) == 1 ? val : num;
private static void chmax<T>(ref T num, T val) where T : IComparable<T>
=> num = num.CompareTo(val) == -1 ? val : num;
private static void swap<T>(ref T v1,ref T v2)
{ var t = v2;v2 = v1;v1 = t; }
static void Main(string[] args)
{
var pr = new Program();
var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
Console.SetOut(sw);
pr.Solve();
Console.Out.Flush();
}
List<int>[] adj;
BIT b;
long res;
void Solve()
{
var num = Input.num;
adj = Input.edge<int>(num);
for (var i = 0; i < num - 1; i++)
adj[Input.Next<int>()].Add(i + 1);
b = new BIT(num + 1);
res = 0;
dfs(0);
WriteLine(res);
}
void dfs(int index)
{
b.add(index+1, 1);
if (index != 0)
res += b[index];
foreach (var ad in adj[index])
dfs(ad);
b.add(index + 1, -1);
}
}
public class BIT
{
//1-indexed
long[] _item;
public BIT(int num)
{
_item = new long[num + 1];
}
public long this[int index]
{
get { var s = 0L; for (var i = index; i > 0; i -= i & -i) s += _item[i]; return s; }
}
public void add(int index, long value)
{
for (var i = index; i < _item.Length; i += i & -i) _item[i] += value;
}
}
public class Input
{
public static string read => ReadLine().Trim();
public static int[] ar => read.Split(' ').Select(int.Parse).ToArray();
public static int num => ToInt32(read);
public static long[] arL => read.Split(' ').Select(long.Parse).ToArray();
public static long numL => ToInt64(read);
public static T[] create<T>(int n, Func<int, T> f)
=> Enumerable.Repeat(0, n).Select(f).ToArray();
public static char[][] grid(int h)
=> create(h, _ => read.ToCharArray());
public static int[] ar1D(int n)
=> create(n, _ => num);
public static long[] arL1D(int n)
=> create(n, _ => numL);
public static string[] strs(int n)
=> create(n, _ => read);
public static int[][] ar2D(int n)
=> create(n, _ => ar);
public static long[][] arL2D(int n)
=> create(n, _ => arL);
public static List<T>[] edge<T>(int n)
=> create(n, _ => new List<T>());
public static T GetValue<T>(string g)
{
var t = typeof(T);
if (t == typeof(int))
return (T)(object)int.Parse(g);
if (t == typeof(long))
return (T)(object)long.Parse(g);
if (t == typeof(string))
return (T)(object)g;
if (t == typeof(char))
return (T)(object)char.Parse(g);
if (t == typeof(double))
return (T)(object)double.Parse(g);
if (t == typeof(bool))
return (T)(object)bool.Parse(g);
return default(T);
}
public static void Make<T1, T2>(out T1 v1, out T2 v2)
{
v1 = Next<T1>();
v2 = Next<T2>();
}
public static void Make<T1, T2, T3>(out T1 v1, out T2 v2, out T3 v3)
{
Make(out v1, out v2);
v3 = Next<T3>();
}
public static void Make<T1, T2, T3, T4>(out T1 v1, out T2 v2, out T3 v3, out T4 v4)
{
Make(out v1, out v2, out v3);
v4 = Next<T4>();
}
public static void Make<T1, T2, T3, T4, T5>(out T1 v1, out T2 v2, out T3 v3, out T4 v4, out T5 v5)
{
Make(out v1, out v2, out v3, out v4);
v5 = Next<T5>();
}
public static void Make<T1, T2, T3, T4, T5, T6>(out T1 v1, out T2 v2, out T3 v3, out T4 v4, out T5 v5, out T6 v6)
{
Make(out v1, out v2, out v3, out v4, out v5);
v6 = Next<T6>();
}
private static Queue<string> sc;
public static T Next<T>(){ sc = sc ?? new Queue<string>(); if (sc.Count == 0) foreach (var item in read.Split(' ')) sc.Enqueue(item);return
        GetValue<T>(sc.Dequeue()); }
public static void Next<T>(ref T val) => val = Next<T>();
public const long Inf = (long)1e18;
public const double eps = 1e-6;
public const string Alfa = "abcdefghijklmnopqrstuvwxyz";
public const int MOD = 1000000007;
}
public class Pair<T1, T2> : IComparable<Pair<T1, T2>>
{
public T1 v1 { get; set; }
public T2 v2 { get; set; }
public Pair() { v1 = Input.Next<T1>(); v2 = Input.Next<T2>(); }
public Pair(T1 v1, T2 v2)
{ this.v1 = v1; this.v2 = v2; }
public int CompareTo(Pair<T1, T2> p)
{
var c = Comparer<T1>.Default.Compare(v1, p.v1);
if (c == 0)
c = Comparer<T2>.Default.Compare(v2, p.v2);
return c;
}
public override string ToString()
=> $"{v1.ToString()} {v2.ToString()}";
public override bool Equals(object obj)
=> this == (Pair<T1, T2>)obj;
public override int GetHashCode()
=> v1.GetHashCode() ^ v2.GetHashCode();
public static bool operator ==(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) == 0;
public static bool operator !=(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) != 0;
public static bool operator >(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) == 1;
public static bool operator >=(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) != -1;
public static bool operator <(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) == -1;
public static bool operator <=(Pair<T1, T2> p1, Pair<T1, T2> p2)
=> p1.CompareTo(p2) != 1;
}
public class Pair<T1, T2, T3> : Pair<T1, T2>, IComparable<Pair<T1, T2, T3>>
{
public T3 v3 { get; set; }
public Pair() : base() { v3 = Input.Next<T3>(); }
public Pair(T1 v1, T2 v2, T3 v3) : base(v1, v2)
{ this.v3 = v3; }
public int CompareTo(Pair<T1, T2, T3> p)
{
var c = base.CompareTo(p);
if (c == 0)
c = Comparer<T3>.Default.Compare(v3, p.v3);
return c;
}
public override string ToString()
=> $"{base.ToString()} {v3.ToString()}";
}
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