Submission #46561251

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Source Code Expand

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;

namespace Tasks;

public class E
{
    public static void Main()
    {
        using var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }

    public static void Solve()
    {
        var (N, T) = Scanner.Scan<int, string>();
        var S = new string[N];
        for (var i = 0; i < N; i++)
        {
            S[i] = Scanner.Scan<string>();
        }

        var A = new int[N];
        var B = new int[N];
        for (var i = 0; i < N; i++)
        {
            var a = 0;
            var b = 0;
            for (var j = 0; j < S[i].Length; j++)
            {
                if (a < T.Length && S[i][j] == T[a]) a++;
                if (b < T.Length && S[i][^(j + 1)] == T[^(b + 1)]) b++;
            }

            A[i] = a;
            B[i] = b;
        }

        Array.Sort(B);

        long answer = 0;
        for (var i = 0; i < N; i++)
        {
            var lb = LowerBound(B, T.Length - A[i]);
            answer += N - lb;
        }

        Console.WriteLine(answer);
    }

    public static int LowerBound<T>(List<T> source, T key, IComparer<T>? comparer = null)
        => LowerBound(System.Runtime.InteropServices.CollectionsMarshal.AsSpan(source), key, comparer);

    public static int LowerBound<T>(ReadOnlySpan<T> source, T key, IComparer<T>? comparer = null)
    {
        comparer ??= Comparer<T>.Default;
        var (lo, hi) = (-1, source.Length);
        while (hi - lo > 1)
        {
            var mi = lo + ((hi - lo) >> 1);
            if (comparer.Compare(source[mi], key) >= 0) hi = mi;
            else lo = mi;
        }

        return hi;
    }

    public static class Scanner
    {
        public static T Scan<T>() where T : IConvertible => Convert<T>(ScanStringArray()[0]);
        public static (T1, T2) Scan<T1, T2>() where T1 : IConvertible where T2 : IConvertible
        {
            var input = ScanStringArray();
            return (Convert<T1>(input[0]), Convert<T2>(input[1]));
        }
        public static (T1, T2, T3) Scan<T1, T2, T3>() where T1 : IConvertible where T2 : IConvertible where T3 : IConvertible
        {
            var input = ScanStringArray();
            return (Convert<T1>(input[0]), Convert<T2>(input[1]), Convert<T3>(input[2]));
        }
        public static (T1, T2, T3, T4) Scan<T1, T2, T3, T4>() where T1 : IConvertible where T2 : IConvertible where T3 : IConvertible where T4 : IConvertible
        {
            var input = ScanStringArray();
            return (Convert<T1>(input[0]), Convert<T2>(input[1]), Convert<T3>(input[2]), Convert<T4>(input[3]));
        }
        public static (T1, T2, T3, T4, T5) Scan<T1, T2, T3, T4, T5>() where T1 : IConvertible where T2 : IConvertible where T3 : IConvertible where T4 : IConvertible where T5 : IConvertible
        {
            var input = ScanStringArray();
            return (Convert<T1>(input[0]), Convert<T2>(input[1]), Convert<T3>(input[2]), Convert<T4>(input[3]), Convert<T5>(input[4]));
        }
        public static (T1, T2, T3, T4, T5, T6) Scan<T1, T2, T3, T4, T5, T6>() where T1 : IConvertible where T2 : IConvertible where T3 : IConvertible where T4 : IConvertible where T5 : IConvertible where T6 : IConvertible
        {
            var input = ScanStringArray();
            return (Convert<T1>(input[0]), Convert<T2>(input[1]), Convert<T3>(input[2]), Convert<T4>(input[3]), Convert<T5>(input[4]), Convert<T6>(input[5]));
        }
        public static IEnumerable<T> ScanEnumerable<T>() where T : IConvertible => ScanStringArray().Select(Convert<T>);
        private static string[] ScanStringArray()
        {
            var line = Console.ReadLine()?.Trim() ?? string.Empty;
            return string.IsNullOrEmpty(line) ? Array.Empty<string>() : line.Split(' ');
        }
        private static T Convert<T>(string value) where T : IConvertible => (T)System.Convert.ChangeType(value, typeof(T));
    }
}

Submission Info

Judge Result