Problem Solving

السلام عليكم و رحمة الله و بركاته

I came through three interesting links yesterday. May be they are common, I'm not really sure.

Here they are..

-UVA toolkit

Here you can browse for a problem, write the Input & it generates the output for you.

Perfect for testing when you think you have the problem right :)

It also links you to the problem statement and the statistics of the problem.

-Young Programmer

Here, there are 2 useful links

1.A Problem set that covers the following topics

• C programming basic
• Algorithm
• Math puzzle
• IQ

2.acm UVa Solutions

where you can check the source codes of some problems.

-Algorithmist

If you navigated to the "UVa" on the left side, you can choose a volume and browse for problems.

Then you can check the category & difficulty of your problem.

If you chose a specific problem, you get some hints for it & sometimes the code is available too.

Detecting the "Enter" key

السلام عليكم و رحمة الله و بركاته

This is a short post.

almost a year ago, I tried to solve a problem on the UVa and i got it "Time limit exceeded". I knew before submitting that it won't be accepted, as i didn't know how to detect the "Enter" key press and it was needed as a stop condition for the first loop :D

anyway, here we go

if you are trying to use "cin" then you'll not be able to detect the new line.

when debugging, u may enter 10 new lines & then a value...i mean it will wait for the value and won't consider the new lines!

you may go to a lower level

if(cin.get() == '\n')

but that's when u are expecting the enter to be pressed

as it reads 1 char only

or u can use "cin.getline()"

and then check for the string's length

if == 0 then "Enter" is pressed

That's useful when u r expecting a mix of strings & enters

sources:

Detecting the enter key

ACMaa Magdi (thanks :))