Submission #750302

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Source Code Expand

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

namespace ConsoleApplication21
{
    using P = KeyValuePair<int, int>;
    class Program
    {
        static void Main()
        {
            StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
            int H = sc.integer();
            int W = sc.integer();
            int sx = 0, sy = 0, gx = 0, gy = 0;
            char[,] c = new char[W, H];
            bool[,] d = new bool[W, H];
            int[] dx = { 1, -1, 0, 0 }, dy = { 0, 0, 1, -1 };
            Stack<P> a = new Stack<P>();
            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; }
                }
            }
            a.Push(new P(sx, sy));
            while (a.Count > 0)
            {
                P pop = a.Pop();
                for (int i = 0; i < 4; i++)
                {
                    int x = pop.Key + dx[i];
                    int y = pop.Value + dy[i];
                    if (0 <= x && x < W && 0 <= y && y < H && c[x, y] != '#' && d[x, y] == false)
                    {
                        a.Push(new P(x, y));
                        d[x, y] = true;
                    }
                }
            }
            if (d[gx, gy]) Console.Write("Yes\n");
            else Console.Write("No\n");
        }
    }
    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