Submission #749634

---

Source Code Expand

using System;
using System.Text;
using System.IO;
using System.Globalization;
using System.Collections.Generic;

namespace ConsoleApplication21
{
    class Program
    {
        public static int H, W;
        public static char[,] c;
        public static byte[,] d;
        static void Main()
        {
            StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
            H = sc.integer();
            W = sc.integer();
            int sx = 0, sy = 0, gx = 0, gy = 0;
            c = new char[W, H];
            d = new byte[W, H];
            for (int i = 0; i < H; i++)
            {
                for (int j = 0; j < W; j++)
                {
                    c[j, i] = sc.Char();
                    if (c[j, i] == 's') { sx = j; sy = i; }
                    if (c[j, i] == 'g') { gx = j; gy = i; }
                }
            }
            search(sx, sy);
            if (d[gx, gy] == 1) Console.Write("Yes\n");
            else Console.Write("No\n");
        }
        static void search(int x, int y)
        {
            int[] dx = { 1, -1, 0, 0 }, dy = { 0, 0, 1, -1 };
            for (int i = 0; i < 4; i++)
            {
                int nx = x + dx[i], ny = y + dy[i];
                if (0 <= nx && nx < W && 0<=ny && ny < H && c[nx, ny] != '#' && d[nx, ny] == 0)
                {
                    d[nx, ny] = 1;
                    search(nx, ny);
                }
            }
        }
    }
    public class StreamScanner
    {
        public StreamScanner(Stream stream) { str = stream; }
        private readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private long 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 Long()
        {
            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 int integer() { return (int)Long(); }
        public double Double() { return double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
}

Submission Info

Judge Result