結果

問題 No.2262 Fractions
ユーザー KumaTachiRenKumaTachiRen
提出日時 2023-04-07 22:19:00
言語 C#
(.NET 8.0.203)
結果
TLE  
実行時間 -
コード長 10,391 bytes
コンパイル時間 9,214 ms
コンパイル使用メモリ 167,324 KB
実行使用メモリ 47,252 KB
最終ジャッジ日時 2024-10-02 19:48:05
合計ジャッジ時間 15,011 ms
ジャッジサーバーID
（参考情報） 		judge2 / 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 TLE -
testcase_01 -- -
testcase_02 -- -
testcase_03 -- -
testcase_04 -- -
testcase_05 -- -
testcase_06 -- -
testcase_07 -- -
testcase_08 -- -
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testcase_11 -- -
testcase_12 -- -
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testcase_15 -- -
testcase_16 -- -
testcase_17 -- -
testcase_18 -- -
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testcase_25 -- -
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testcase_27 -- -
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testcase_30 -- -
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testcase_32 -- -
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testcase_39 -- -
testcase_40 -- -
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testcase_45 -- -
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 (96 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 # 

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using static Functions;

static class Program
{
    static public void Main(string[] args)
    {
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        new Solver();
        Console.Out.Flush();
    }
}

public class Solver
{
    public Solver()
    {
        Solve();
    }

    void Solve()
    {
        int t = ri;
        while (t-- > 0)
        {
            int n = ri;
            long k = rl;

            long tot = 0;
            {
                var dp = new long[n + 1];
                for (int i = 1; i <= n; i++) dp[i] = Floor(n, i) * Floor(n, i);
                for (int i = n; i >= 1; i--)
                    for (int j = i * 2; j <= n; j += i)
                        dp[i] -= dp[j];

                if (dp[1] < k)
                {
                    Write(-1);
                    continue;
                }
                tot = dp[1];
            }

            if (k == (tot + 1) / 2)
            {
                Write($"1/1");
                continue;
            }

            bool inv = false;
            if (k > (tot + 1) / 2)
            {
                k = tot - k + 1;
                inv = true;
            }

            {
                long l = 0, r = (long)n * n;
                while (r - l > 1)
                {
                    long x = (l + r) / 2;
                    var dp = new long[n + 1];
                    for (int i = 1; i <= n; i++)
                        for (int a = i; a <= n; a += i)
                            dp[i] += Math.Min(n, a * x / n / n) / i;
                    for (int i = n; i >= 1; i--)
                        for (int j = i * 2; j <= n; j += i)
                            dp[i] -= dp[j];
                    if (dp[1] < k) l = x;
                    else r = x;
                }
                for (long a = 1; a <= n; a++)
                {
                    long x = a * l / n / n + 1;
                    long y = a * r / n / n;
                    if (x == y)
                    {
                        if (!inv) Write($"{y}/{a}");
                        else Write($"{a}/{y}");
                        break;
                    }
                }
            }
        }
    }

    const long INF = 1L << 60;
    int ri { get { return (int)sc.Integer(); } }
    long rl { get { return sc.Integer(); } }
    ulong rul { get { return sc.UInteger(); } }
    double rd { get { return sc.Double(); } }
    string rs { get { return sc.Scan(); } }
    string rline { get { return sc.Line(); } }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    T[] RepArray<T>(T t, int count) => Enumerable.Repeat(t, count).ToArray();
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void WriteJoin<T>(string s, IEnumerable<T> t) => Console.WriteLine(string.Join(s, t));
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void WriteMat<T>(T[,] a)
    {
        int sz1 = a.GetLength(0);
        int sz2 = a.GetLength(1);
        for (int i = 0; i < sz1; i++)
        {
            var s = new List<string>();
            for (int j = 0; j < sz2; j++) s.Add(a[i, j].ToString());
            WriteJoin(" ", s);
        }
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(object t) => Console.WriteLine(t.ToString());
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(string str) => Console.WriteLine(str);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(string str, object arg1) => Console.WriteLine(str, arg1);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(string str, object arg1, object arg2) => Console.WriteLine(str, arg1, arg2);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(string str, object arg1, object arg2, object arg3) => Console.WriteLine(str, arg1, arg2, arg3);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Write(string str, params object[] arg) => Console.WriteLine(str, arg);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void WriteFlush(object t)
    { Console.WriteLine(t.ToString()); Console.Out.Flush(); }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void WriteError(object t) => Console.Error.WriteLine(t.ToString());
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void YN(bool t) => Console.WriteLine(t ? "YES" : "NO");
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void Yn(bool t) => Console.WriteLine(t ? "Yes" : "No");
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    void yn(bool t) => Console.WriteLine(t ? "yes" : "no");
}

public static class Functions
{
    public static int Popcount(ulong x)
    {
        x = (x & 0x5555555555555555UL) + ((x >> 1) & 0x5555555555555555UL);
        x = (x & 0x3333333333333333UL) + ((x >> 2) & 0x3333333333333333UL);
        x = (x & 0x0f0f0f0f0f0f0f0fUL) + ((x >> 4) & 0x0f0f0f0f0f0f0f0fUL);
        x = (x & 0x00ff00ff00ff00ffUL) + ((x >> 8) & 0x00ff00ff00ff00ffUL);
        x = (x & 0x0000ffff0000ffffUL) + ((x >> 16) & 0x0000ffff0000ffffUL);
        x = (x & 0x00000000ffffffffUL) + ((x >> 32) & 0x00000000ffffffffUL);
        return (int)x;
    }
    public static int Popcount(int x)
    {
        x = (x & 0x55555555) + ((x >> 1) & 0x55555555);
        x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
        x = (x & 0x0f0f0f0f) + ((x >> 4) & 0x0f0f0f0f);
        x = (x & 0x00ff00ff) + ((x >> 8) & 0x00ff00ff);
        x = (x & 0x0000ffff) + ((x >> 16) & 0x0000ffff);
        return x;
    }
    public static int Ctz(long x)
    {
        if (x == 0) return -1;
        return Popcount((ulong)((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;
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static int Sign(long x) => x == 0 ? 0 : (x < 0 ? -1 : 1);
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static int DigitSum(long n, int d = 10) { long s = 0; while (n > 0) { s += n % d; n /= d; } return (int)s; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static long Floor(long a, long b) => a >= 0 ? a / b : (a + 1) / b - 1;
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static long Ceil(long a, long b) => a > 0 ? (a - 1) / b + 1 : a / b;
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static int Gcd(int a, int b) => b == 0 ? a : Gcd(b, a % b);
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static long Gcd(long a, long b) => b == 0 ? a : Gcd(b, a % b);
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Swap(ref int x, ref int y) { x ^= y; y ^= x; x ^= y; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Swap(ref long x, ref long y) { x ^= y; y ^= x; x ^= y; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Swap<T>(ref T x, ref T y) { T t = y; y = x; x = t; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] 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);
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static T Clamp<T>(ref T x, T l, T r) where T : IComparable<T> => x = x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r);
    [MethodImpl(MethodImplOptions.AggressiveInlining)] public static void Chmin<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) > 0) x = y; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)] 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>(T[] arr, Func<T, int> comp, int l = -1, int r = -1) => LowerBound<T>(arr.AsSpan<T>(), comp, l, r);
    public static int LowerBound<T>(Span<T> data, Func<T, int> comp, int l = -1, int r = -1)
    {
        if (data.Length == 0) return -1;
        if (l == -1) l = 0;
        if (r == -1) r = data.Length;
        while (l < r)
        {
            int x = (l + r) / 2;
            if (comp(data[x]) < 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 Line()
    {
        var sb = new StringBuilder();
        for (var b = Char(); b != 10 && !isEof; b = (char)read()) sb.Append(b);
        return sb.ToString();
    }
    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 ulong UInteger()
    {
        ulong ret = 0; byte b = 0;
        do b = read();
        while (b < '0' || '9' < b);
        for (; true; b = read())
        {
            if (b < '0' || '9' < b) return ret;
            else ret = ret * 10 + b - '0';
        }
    }
    public double Double() { return double.Parse(Scan()); }
}
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