Submission #420212

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Source Code Expand

using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int[] DR = { 0, 1, 0, -1 };
    static readonly int[] DC = { 1, 0, -1, 0 };
    int H, W;
    string[] Grid;
    bool[,] seen;

    public void Solve()
    {
        H = Reader.Int();
        W = Reader.Int();
        Grid = Reader.StringArray(H);
        seen = new bool[H, W];
        for (int r = 0; r < H; r++)
            for (int c = 0; c < W; c++)
                if (Grid[r][c] == 's' && DFS(r, c))
                {
                    Console.WriteLine("Yes");
                    return;
                }
        Console.WriteLine("No");
    }

    private bool DFS(int r, int c)
    {
        seen[r, c] = true;
        for (int d = 0; d < DR.Length; d++)
        {
            int nr = r + DR[d], nc = c + DC[d];
            if (IsInside(nr, nc))
            {
                if (Grid[nr][nc] == 'g' || !seen[nr, nc] && Grid[nr][nc] == '.' && DFS(nr, nc)) return true;
            }
        }
        return false;
    }

    bool IsInside(int r, int c) { return r >= 0 && r < H && c >= 0 && c < W; }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}

Submission Info

Judge Result