Dynamic programming

For improving our programming knowledge,we learn different algorithm and then find the problem numbers of different online programming sites.
Here is 300 DP problems of Uva
300 DP Problems

Big Number problem in JAVA in programming contest

Bignumber problem can be solved easily using BigInteger class in java.Here is a sample for doing this....

import java.math.BigInteger;

public class BIG
{
public static void main(String[] args)
{
//initialization
BigInteger N1 = new BigInteger ("1000000000000000000");
BigInteger N2 = new BigInteger ("123456789123");
BigInteger N3 = new BigInteger ("50000000000");
//Math operations
BigInteger mult = N1.multiply(N2); //This is how to send arguments in bigint functions
BigInteger add = N1.add(N2);
BigInteger div= N1.divide(N2);
BigInteger substract1 = N1.subtract(N2); //N1-N2
BigInteger substract2 = N2.subtract(N1); //N2-N1
BigInteger gcd = N1.gcd(N3);
//Printing output
System.out.println("Mult >>> " + mult);
System.out.println("add >>> " + add);
System.out.println("div >>> " + div);
System.out.println("substract1 >>> " + substract1);
System.out.println("substract2 >>> " + substract2);
System.out.println("gcd N1 N3 >>> " + gcd);
}
}

There are some more built in functions:

BigInteger.ONE; (==1)
BigInteger.ZERO;(==0)
A.abs();
A.add(N);
A.divide(N);
A.divideAndRemainder(N); (returns an array)
A.max(N);
A.min(N);
A.mod(N);
A.multiply(N);
A.remainder(N);
A.signum(N);

A.doubleValue();
A.floatValue();
A.intValue();
A.longValue();
A.toString();
A.compareTo(N)

converting an integer to bigint
BigInteger A = BigInteger.valueOf(20000);
You can take input using scanner just as you input int,long etc.


Reference:
BigInteger Class

Converting .jar to .exe

Generally people try to,look for making the .exe of their application created by java.Actually I did the same and found that there is no need to convert our JAR files to .EXE .Because we know that JAVA is platform independent.But in .exe,this attribute will be lost.So,lets don't spoil our times to convert .jar to a .exe

To make a little bit clear sense,you can read this post,
convert-java-into-program-i-e-exe-file.html
how-convert-jar-file-into-exe-file.html





If you are not clear by now,then read this......
CREATING JAR FILES

Sending mail from php

Today I am going to post a simple method to send mail from php code.To this we must use SMTP [Simple Mail Transfer protocol]which uses default port that is 25.Before sending mail,SMTP server name must be included in php.ini .To make our job easier I will use three php files.
They are
01: SMTPconfig.php
02: SMTPclass.php
03: index.php


01: SMTPconfig.php

//Server Address
$SmtpServer="gmail.com";
$SmtpPort="25"; //default
$SmtpUser="yourgmailid@gmail.com";
$SmtpPass="yourgmailpassword";


Here,SMTP server setup is completed.



02: SMTPclass.php


class SMTPClient
{

function SMTPClient ($SmtpServer, $SmtpPort, $SmtpUser, $SmtpPass, $from, $to, $subject, $body)
{

$this->SmtpServer = $SmtpServer;
$this->SmtpUser = base64_encode ($SmtpUser);
$this->SmtpPass = base64_encode ($SmtpPass);
$this->from = $from;
$this->to = $to;
$this->subject = $subject;
$this->body = $body;

if ($SmtpPort == "")
{
$this->PortSMTP = 25;
}
else
{
$this->PortSMTP = $SmtpPort;
}
}

function SendMail ()
{
if ($SMTPIN = fsockopen ($this->SmtpServer, $this->PortSMTP))
{
fputs ($SMTPIN, "EHLO ".$HTTP_HOST."\r\n");
$talk["hello"] = fgets ( $SMTPIN, 1024 );
fputs($SMTPIN, "auth login\r\n");
$talk["res"]=fgets($SMTPIN,1024);
fputs($SMTPIN, $this->SmtpUser."\r\n");
$talk["user"]=fgets($SMTPIN,1024);
fputs($SMTPIN, $this->SmtpPass."\r\n");
$talk["pass"]=fgets($SMTPIN,256);
fputs ($SMTPIN, "MAIL FROM: <".$this->from.">\r\n");
$talk["From"] = fgets ( $SMTPIN, 1024 );
fputs ($SMTPIN, "RCPT TO: <".$this->to.">\r\n");
$talk["To"] = fgets ($SMTPIN, 1024);
fputs($SMTPIN, "DATA\r\n");
$talk["data"]=fgets( $SMTPIN,1024 );
fputs($SMTPIN, "To: <".$this->to.">\r\nFrom: <".$this->from.">\r\nSubject:".$this->subject."\r\n\r\n\r\n".$this->body."\r\n.\r\n");
$talk["send"]=fgets($SMTPIN,256);
//CLOSE CONNECTION AND EXIT ...
fputs ($SMTPIN, "QUIT\r\n");
fclose($SMTPIN);
//
}
return $talk;
}
}
/////////////////////////////////



03: index.php


include('SMTPconfig.php');
include('SMTPClass.php');
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$to = "to_mailid";
$from = "from_mailid";
$subject = "subject";
$body = "message";
$SMTPMail = new SMTPClient ($SmtpServer, $SmtpPort, $SmtpUser, $SmtpPass, $from, $to, $subject, $body);
$SMTPChat = $SMTPMail->SendMail();
}


Thanks for visiting this...
to be more clear Click here

Blog collections

Here I am posting a link where you can find almost all kind of programming related blogs...Blog collection

Displaying a table from database

Hi everyone,how is going on?
You can use TUTORIAL for any kind of problems in JAVA.

Codeforces

to be a good programmer, we must attend programming contest.A contest is going to be held at 10 P.M.(Bangladesh) in 18th March,2011.
visit this to register

And a contest will be held on tomorrow at