結果

問題 No.2089 置換の符号
ユーザー KumaTachiRenKumaTachiRen
提出日時 2022-09-30 21:29:03
言語 C#
(.NET 8.0.404)
結果
AC  
実行時間 52 ms / 2,000 ms
コード長 6,902 bytes
コンパイル時間 7,881 ms
コンパイル使用メモリ 166,312 KB
実行使用メモリ 187,424 KB
最終ジャッジ日時 2024-12-22 22:23:40
合計ジャッジ時間 10,453 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
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
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 (98 ms)。
MSBuild のバージョン 17.9.6+a4ecab324 (.NET)
  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 #
プレゼンテーションモードにする

using System.Diagnostics;
using System;
using System.Linq;
using System.Numerics;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using static Functions;
using N = System.Int64;
static class Program
{
static public void Main(string[] args)
{
Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
var solver = new Solver();
solver.Solve();
Console.Out.Flush();
}
}
public class Solver
{
public void Solve()
{
int n = ri;
var bit = new BinaryIndexedTree<int>(n, (x, y) => x ^ y, 0);
int ans = (n * (n - 1) / 2) & 1;
for (int i = 0; i < n; i++)
{
int a = ri - 1;
ans ^= bit.Sum(a);
bit.Add(a, 1);
}
Write(ans == 0 ? 1 : -1);
}
class BinaryIndexedTree<T>
{
int size;
T[] data;
T e;
Func<T, T, T> op;
public BinaryIndexedTree(int _size, Func<T, T, T> _op, T _e)
{
size = _size + 1;
op = _op;
e = _e;
data = new T[size];
for (int i = 0; i < size; i++) data[i] = e;
}
public BinaryIndexedTree(T[] arr, Func<T, T, T> _op, T _e)
{
size = arr.Length + 1;
op = _op;
data = new T[size];
for (int i = 0; i < size; i++) data[i] = e;
for (int i = 0; i < size - 1; i++) AddSub(i + 1, arr[i]);
}
public void Add(int x, T v) => AddSub(x + 1, v);
private void AddSub(int x, T v)
{
for (int i = x; i < size; i += i & -i) data[i] = op(data[i], v);
}
public T Sum(int x) => SumSub(x + 1);
private T SumSub(int x)
{
T ret = e;
for (int i = x; i > 0; i -= i & -i) ret = op(ret, data[i]);
return ret;
}
}
const long inf = (long)1 << 60;
int ri { get { return (int)sc.Integer(); } }
long rl { get { return sc.Integer(); } }
double rd { get { return sc.Double(); } }
string rs { get { return sc.Scan(); } }
public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
void WriteJoin<T>(string s, T[] t) { Console.WriteLine(string.Join(s, t)); }
void WriteJoin<T>(string s, List<T> t) { Console.WriteLine(string.Join(s, t)); }
void Write<T>(T t) { Console.WriteLine(t.ToString()); }
void WriteFlush<T>(T t) { Console.WriteLine(t.ToString()); Console.Out.Flush(); }
void WriteError<T>(T t) { Console.Error.WriteLine(t.ToString()); }
void YN(bool t) { Console.WriteLine(t ? "YES" : "NO"); }
void Yn(bool t) { Console.WriteLine(t ? "Yes" : "No"); }
void yn(bool t) { Console.WriteLine(t ? "yes" : "no"); }
}
public static class Functions
{
public static int Popcount(long x)
{
x = x - ((x >> 1) & 0x5555555555555555);
x = (x & 0x3333333333333333) + ((x >> 2) & 0x3333333333333333);
x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0f;
x = x + (x >> 8);
x = x + (x >> 16);
x = x + (x >> 32);
return (int)(x & 0x0000007f);
}
public static int Ctz(long x)
{
if (x == 0) return -1;
return Popcount((x & -x) - 1);
}
public static int SafeMod(int x, int m)
{
int r = x % m;
return r < 0 ? r + m : r;
}
public static long SafeMod(long x, long m)
{
long r = x % m;
return r < 0 ? r + m : r;
}
public static long Floor(long a, long b) => a >= 0 ? a / b : (a + 1) / b - 1;
public static long Ceil(long a, long b) => a > 0 ? (a - 1) / b + 1 : a / b;
public static int Gcd(int a, int b) => b == 0 ? a : Gcd(b, a % b);
public static long Gcd(long a, long b) => b == 0 ? a : Gcd(b, a % b);
public static void Swap(ref int x, ref int y) { x ^= y; y ^= x; x ^= y; }
public static void Swap(ref long x, ref long y) { x ^= y; y ^= x; x ^= y; }
public static void Swap<T>(ref T x, ref T y) { T t = y; y = x; x = t; }
public static T Clamp<T>(T x, T l, T r) where T : IComparable<T> => x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r);
public static void Chmin<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) > 0) x = y; }
public static void Chmax<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) < 0) x = y; }
public static int LowerBound<T, S>(in T[] list, S val, Func<T, S, int> comp)
{
if (list.Length == 0) return -1;
if (comp(list.Last(), val) <= 0) return list.Length;
int l = 0, r = list.Length;
while (l < r)
{
int x = (l + r) / 2;
if (comp(list[x], val) < 0) l = x + 1;
else r = x;
}
return l;
}
public static int LowerBound<T, S>(in List<T> list, S val, Func<T, S, int> comp)
{
if (list.Count == 0) return -1;
if (comp(list.Last(), val) <= 0) return list.Count;
int l = 0, r = list.Count;
while (l < r)
{
int x = (l + r) / 2;
if (comp(list[x], val) < 0) l = x + 1;
else r = x;
}
return l;
}
public static int UpperBound<T, S>(in List<T> list, S val, Func<T, S, int> comp)
{
if (list.Count == 0) return 0;
if (comp(list.Last(), val) < 0) return list.Count;
int l = 0, r = list.Count;
while (l < r)
{
int x = (l + r) / 2;
if (comp(list[x], val) <= 0) l = x + 1;
else r = x;
}
return l;
}
}
public 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; } }
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++];
}
public char Char()
{
byte b = 0;
do b = read();
while (b < 33 || 126 < b);
return (char)b;
}
public string Scan()
{
var sb = new StringBuilder();
for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
return sb.ToString();
}
public long Integer()
{
long ret = 0; byte b = 0; var ng = false;
do b = read();
while (b != '-' && (b < '0' || '9' < b));
if (b == '-') { ng = true; b = read(); }
for (; true; b = read())
{
if (b < '0' || '9' < b) return ng ? -ret : ret;
else ret = ret * 10 + b - '0';
}
}
public double Double() { return double.Parse(Scan()); }
}
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