結果

問題 No.1072 A Nice XOR Pair
ユーザー EmKjpEmKjp
提出日時 2020-06-05 21:41:30
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 160 ms / 2,000 ms
コード長 5,939 bytes
コンパイル時間 1,059 ms
コンパイル使用メモリ 117,132 KB
実行使用メモリ 51,360 KB
最終ジャッジ日時 2024-12-17 13:54:53
合計ジャッジ時間 2,820 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
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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 28 ms
23,912 KB
testcase_01 AC 28 ms
23,784 KB
testcase_02 AC 27 ms
24,024 KB
testcase_03 AC 27 ms
24,040 KB
testcase_04 AC 28 ms
24,112 KB
testcase_05 AC 28 ms
25,960 KB
testcase_06 AC 29 ms
25,964 KB
testcase_07 AC 159 ms
43,912 KB
testcase_08 AC 131 ms
32,044 KB
testcase_09 AC 125 ms
27,952 KB
testcase_10 AC 129 ms
29,956 KB
testcase_11 AC 122 ms
34,012 KB
testcase_12 AC 160 ms
51,360 KB
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;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Text;
using System.Linq;
using E = System.Linq.Enumerable;
internal partial class Solver {
public void Run() {
var n = ni();
var x = ni();
var a = ni(n);
var h = new HashMap<int, int>();
foreach (var p in a) {
h[p]++;
}
long ans = 0;
foreach (var p in a) {
var count = h[p ^ x];
if (p == (p ^ x)) {
count--;
}
ans += count;
}
cout.WriteLine(ans / 2);
}
}
public class HashMap<TKey, TValue> : Dictionary<TKey, TValue> {
public new TValue this[TKey index] {
get {
TValue value;
if (TryGetValue(index, out value)) {
return value;
} else {
return base[index] = default(TValue);
}
}
set {
base[index] = value;
}
}
}
// PREWRITEN CODE BEGINS FROM HERE
static public class StringExtensions {
static public string JoinToString<T>(this IEnumerable<T> source, string separator = " ") {
return string.Join(separator, source);
}
}
internal partial class Solver : Scanner {
public static void Main() {
#if LOCAL
byte[] inputBuffer = new byte[1000000];
var inputStream = Console.OpenStandardInput(inputBuffer.Length);
using (var reader = new StreamReader(inputStream, Console.InputEncoding, false, inputBuffer.Length)) {
Console.SetIn(reader);
new Solver(Console.In, Console.Out).Run();
}
#else
Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
new Solver(Console.In, Console.Out).Run();
Console.Out.Flush();
#endif
}
#pragma warning disable IDE0052
private readonly TextReader cin;
private readonly TextWriter cout;
private readonly TextWriter cerr;
#pragma warning restore IDE0052
public Solver(TextReader reader, TextWriter writer)
: base(reader) {
cin = reader;
cout = writer;
cerr = Console.Error;
}
public Solver(string input, TextWriter writer)
: this(new StringReader(input), writer) {
}
#pragma warning disable IDE1006
#pragma warning disable IDE0051
private int ni() { return NextInt(); }
private int[] ni(int n) { return NextIntArray(n); }
private long nl() { return NextLong(); }
private long[] nl(int n) { return NextLongArray(n); }
private double nd() { return NextDouble(); }
private double[] nd(int n) { return NextDoubleArray(n); }
private string ns() { return Next(); }
private string[] ns(int n) { return NextArray(n); }
#pragma warning restore IDE1006
#pragma warning restore IDE0051
}
internal static class LinqPadExtension {
[Conditional("DEBUG")]
public static void Dump<T>(this T obj) {
#if DEBUG
LINQPad.Extensions.Dump(obj);
#endif
}
}
public class Scanner {
private readonly TextReader Reader;
private readonly CultureInfo ci = CultureInfo.InvariantCulture;
private readonly char[] buffer = new char[2 * 1024];
private int cursor = 0, length = 0;
private string Token;
private readonly StringBuilder sb = new StringBuilder(1024);
public Scanner()
: this(Console.In) {
}
public Scanner(TextReader reader) {
Reader = reader;
}
public int NextInt() { return checked((int)NextLong()); }
public long NextLong() {
var s = Next();
long r = 0;
int i = 0;
bool negative = false;
if (s[i] == '-') {
negative = true;
i++;
}
for (; i < s.Length; i++) {
r = r * 10 + (s[i] - '0');
#if DEBUG
if (!char.IsDigit(s[i])) throw new FormatException();
#endif
}
return negative ? -r : r;
}
public double NextDouble() { return double.Parse(Next(), ci); }
public string[] NextArray(int size) {
string[] array = new string[size];
for (int i = 0; i < size; i++) {
array[i] = Next();
}
return array;
}
public int[] NextIntArray(int size) {
int[] array = new int[size];
for (int i = 0; i < size; i++) {
array[i] = NextInt();
}
return array;
}
public long[] NextLongArray(int size) {
long[] array = new long[size];
for (int i = 0; i < size; i++) {
array[i] = NextLong();
}
return array;
}
public double[] NextDoubleArray(int size) {
double[] array = new double[size];
for (int i = 0; i < size; i++) {
array[i] = NextDouble();
}
return array;
}
public string Next() {
if (Token == null) {
if (!StockToken()) {
throw new Exception();
}
}
var token = Token;
Token = null;
return token;
}
public bool HasNext() {
if (Token != null) {
return true;
}
return StockToken();
}
private bool StockToken() {
while (true) {
sb.Clear();
while (true) {
if (cursor >= length) {
cursor = 0;
if ((length = Reader.Read(buffer, 0, buffer.Length)) <= 0) {
break;
}
}
var c = buffer[cursor++];
if (33 <= c && c <= 126) {
sb.Append(c);
} else {
if (sb.Length > 0) break;
}
}
if (sb.Length > 0) {
Token = sb.ToString();
return true;
}
return false;
}
}
}
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