CS106B - Free Course from Stanford

CS106B is a free course from Stanford available online. This course is about data structures and recursion.

The latest free video lectures are made last 2011 Spring Quarter and you can access them at ClassX - CS106B: Programming Abstractions. The professor during this quarter is Steve Cooper. You can visit the CS106B's website in this quarter here. All lecture handouts, codes, the course reader, assignments and many other materials for the course are available in the website.

An older set of video lectures are available at SEE (Stanford Engineering Everywhere) - Programming Abstractions. Go to the bottom part of the web page to download the complete course materials.

If you are planning to do the assignments and compile the example codes during the lectures you'll need Visual Studio 2005 and the CS106 Library. If you have Visual Studio 2008 instead, please read Dani's article on how you can make the CS106B Library work with Visual Studio 2008.

Enjoy!

I have done some of the assignments last 2011 Spring Quarter. You can view my solutions here. Please pardon my code because they are not well structured and not commented. Thanks.

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Your Ride Is Here

This is the problem specification of "Your Ride is Here" from USACO.

It is a well-known fact that behind every good comet is a UFO. These UFOs often come to collect loyal supporters from here on Earth. Unfortunately, they only have room to pick up one group of followers on each trip. They do, however, let the groups know ahead of time which will be picked up for each comet by a clever scheme: they pick a name for the comet which, along with the name of the group, can be used to determine if it is a particular group's turn to go (who do you think names the comets?). The details of the matching scheme are given below; your job is to write a program which takes the names of a group and a comet and then determines whether the group should go with the UFO behind that comet.

Both the name of the group and the name of the comet are converted into a number in the following manner: the final number is just the product of all the letters in the name, where "A" is 1 and "Z" is 26. For instance, the group "USACO" would be 21 * 19 * 1 * 3 * 15 = 17955. If the group's number mod 47 is the same as the comet's number mod 47, then you need to tell the group to get ready! (Remember that "a mod b" is the remainder left over after dividing a by b; 34 mod 10 is 4.)

Write a program which reads in the name of the comet and the name of the group and figures out whether according to the above scheme the names are a match, printing "GO" if they match and "STAY" if not. The names of the groups and the comets will be a string of capital letters with no spaces or punctuation, up to 6 characters long.

Examples:

Input	Output
COMETQ HVNGAT	GO
ABSTAR USACO	STAY

PROGRAM NAME: ride

This means that you fill in your header with:
PROG: ride

INPUT FORMAT

Line 1: An upper case character string of length 1..6 that is the name of the comet.

Line 2: An upper case character string of length 1..6 that is the name of the group.

NOTE: The input file has a newline at the end of each line but does not have a "return". Sometimes, programmers code for the Windows paradigm of "return" followed by "newline"; don't do that! Use simple input routines like "readln" (for Pascal) and, for C/C++, "fscanf" and "fid>>string".


SAMPLE INPUT (file ride.in) 
COMETQ
HVNGAT

OUTPUT FORMAT

A single line containing either the word "GO" or the word "STAY".

SAMPLE OUTPUT (file ride.out)
GO

You can view my solution at PlanetSourceCode.com

 

Validation of viewstate MAC failed - ASP.NET Error

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Server Error in '/Login' Application.

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

What I did to solve this.

I removed the action attribute in the <form> tag.

I changed

<form id="form1" action="DisplayName.aspx" runat="server">

into

<form id="form1" runat="server">

and placed

Response.Redirect("DisplayName.aspx");

in code behind file.