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Ema's Supercomputer.cs
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Ema's Supercomputer.cs
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using System;
using System.Linq;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Globalization;
using System.Collections.Generic;
using System.Threading;
using kp.Algo;
using kp.Algo.IO;
namespace CodeForces
{
internal class Solution
{
const int StackSize = 20 * 1024 * 1024;
private void Solve()
{
int rows = NextInt();
int cols = NextInt();
var s = new string[rows];
for (int i = 0; i < rows; i++)
{
s[i] = NextLine().Trim();
}
int res = 0;
var w = new int[rows, cols];
int step = 0;
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < cols; j++)
{
if (s[i][j] == 'G')
{
w[i, j] = ++step;
int ur = i, dr = i, lc = j, rc = j;
var sq = 1;
var len = 0;
while (true)
{
for (int ii = 0; ii < rows; ii++)
{
for (int jj = 0; jj < cols; jj++)
{
if (s[ii][jj] == 'G' && (ii != i || jj != j))
{
int ur2 = ii, dr2 = ii, lc2 = jj, rc2 = jj;
var sq2 = 1;
while (true)
{
res = Math.Max(res, sq * sq2);
if (--ur2 < 0 || s[ur2][jj] != 'G' || w[ur2, jj] == step) break;
if (++dr2 == rows || s[dr2][jj] != 'G' || w[dr2, jj] == step) break;
if (--lc2 < 0 || s[ii][lc2] != 'G' || w[ii, lc2] == step) break;
if (++rc2 == cols || s[ii][rc2] != 'G' || w[ii, rc2] == step) break;
sq2 += 4;
}
}
}
}
if (--ur < 0 || s[ur][j] != 'G') break;
if (++dr == rows || s[dr][j] != 'G') break;
if (--lc < 0 || s[i][lc] != 'G') break;
if (++rc == cols || s[i][rc] != 'G') break;
sq += 4;
++len;
w[ur, j] = step;
w[dr, j] = step;
w[i, lc] = step;
w[i, rc] = step;
}
}
}
}
Out.WriteLine(res);
}
#region Local wireup
public int[] NextIntArray(int size)
{
var res = new int[size];
for (int i = 0; i < size; ++i) res[i] = NextInt();
return res;
}
public long[] NextLongArray(int size)
{
var res = new long[size];
for (int i = 0; i < size; ++i) res[i] = NextLong();
return res;
}
public double[] NextDoubleArray(int size)
{
var res = new double[size];
for (int i = 0; i < size; ++i) res[i] = NextDouble();
return res;
}
public int NextInt()
{
return _in.NextInt();
}
public long NextLong()
{
return _in.NextLong();
}
public string NextLine()
{
return _in.NextLine();
}
public double NextDouble()
{
return _in.NextDouble();
}
Scanner _in;
static readonly TextWriter Out = Console.Out;
void Start()
{
#if KP_HOME
_in = new Scanner("input.txt");
var timer = new Stopwatch();
timer.Start();
#else
_in = new Scanner( Console.In, false );
#endif
var t = new Thread(Solve, StackSize);
t.Start();
t.Join();
#if KP_HOME
timer.Stop();
Console.WriteLine(string.Format(CultureInfo.InvariantCulture, "Done in {0} seconds.\nPress <Enter> to exit.", timer.ElapsedMilliseconds / 1000.0));
Console.ReadLine();
#endif
}
static void Main()
{
new Solution().Start();
}
#endregion
}
}
namespace kp.Algo { }
namespace kp.Algo.IO
{
public class Scanner : IDisposable
{
#region Fields
readonly System.IO.TextReader _reader;
readonly int _bufferSize;
readonly bool _closeReader;
readonly char[] _buffer;
int _length, _pos;
#endregion
#region .ctors
public Scanner( System.IO.TextReader reader, int bufferSize, bool closeReader )
{
_reader = reader;
_bufferSize = bufferSize;
_closeReader = closeReader;
_buffer = new char[_bufferSize];
FillBuffer( false );
}
public Scanner( System.IO.TextReader reader, bool closeReader ) : this( reader, 1 << 16, closeReader ) { }
public Scanner( string fileName ) : this( new System.IO.StreamReader( fileName, System.Text.Encoding.Default ), true ) { }
#endregion
#region IDisposable Members
public void Dispose()
{
if ( _closeReader )
{
_reader.Close();
}
}
#endregion
#region Properties
public bool Eof
{
get
{
if ( _pos < _length ) return false;
FillBuffer( false );
return _pos >= _length;
}
}
#endregion
#region Methods
private char NextChar()
{
if ( _pos < _length ) return _buffer[_pos++];
FillBuffer( true );
return _buffer[_pos++];
}
private char PeekNextChar()
{
if ( _pos < _length ) return _buffer[_pos];
FillBuffer( true );
return _buffer[_pos];
}
private void FillBuffer( bool throwOnEof )
{
_length = _reader.Read( _buffer, 0, _bufferSize );
if ( throwOnEof && Eof )
{
throw new System.IO.IOException( "Can't read beyond the end of file" );
}
_pos = 0;
}
public int NextInt()
{
var neg = false;
int res = 0;
SkipWhitespaces();
if ( !Eof && PeekNextChar() == '-' )
{
neg = true;
_pos++;
}
while ( !Eof && !IsWhitespace( PeekNextChar() ) )
{
var c = NextChar();
if ( c < '0' || c > '9' ) throw new ArgumentException( "Illegal character" );
res = 10 * res + c - '0';
}
return neg ? -res : res;
}
public int[] NextIntArray( int n )
{
var res = new int[n];
for ( int i = 0; i < n; i++ )
{
res[i] = NextInt();
}
return res;
}
public long NextLong()
{
var neg = false;
long res = 0;
SkipWhitespaces();
if ( !Eof && PeekNextChar() == '-' )
{
neg = true;
_pos++;
}
while ( !Eof && !IsWhitespace( PeekNextChar() ) )
{
var c = NextChar();
if ( c < '0' || c > '9' ) throw new ArgumentException( "Illegal character" );
res = 10 * res + c - '0';
}
return neg ? -res : res;
}
public long[] NextLongArray( int n )
{
var res = new long[n];
for ( int i = 0; i < n; i++ )
{
res[i] = NextLong();
}
return res;
}
public string NextLine()
{
SkipUntilNextLine();
if ( Eof ) return "";
var builder = new System.Text.StringBuilder();
while ( !Eof && !IsEndOfLine( PeekNextChar() ) )
{
builder.Append( NextChar() );
}
return builder.ToString();
}
public double NextDouble()
{
SkipWhitespaces();
var builder = new System.Text.StringBuilder();
while ( !Eof && !IsWhitespace( PeekNextChar() ) )
{
builder.Append( NextChar() );
}
return double.Parse( builder.ToString(), System.Globalization.CultureInfo.InvariantCulture );
}
public double[] NextDoubleArray( int n )
{
var res = new double[n];
for ( int i = 0; i < n; i++ )
{
res[i] = NextDouble();
}
return res;
}
public string NextToken()
{
SkipWhitespaces();
var builder = new System.Text.StringBuilder();
while ( !Eof && !IsWhitespace( PeekNextChar() ) )
{
builder.Append( NextChar() );
}
return builder.ToString();
}
private void SkipWhitespaces()
{
while ( !Eof && IsWhitespace( PeekNextChar() ) )
{
++_pos;
}
}
private void SkipUntilNextLine()
{
while ( !Eof && IsEndOfLine( PeekNextChar() ) )
{
++_pos;
}
}
private static bool IsWhitespace( char c )
{
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
private static bool IsEndOfLine( char c )
{
return c == '\n' || c == '\r';
}
#endregion
}
}