i am new to competitive programming …i am unable to solve more than one problem in the june challenge…
how should i improve my programming skills …
any book or website links to know the algorithms and programming skills…
Refer this link and learn various algorithms and data structures.
https://discuss.codechef.com/questions/48877/data-structures-and-algorithms
Also no one becomes great in a day or two, practice is the key.
Keep participating, keep solving and you will be good eventually !
go here and solve all the problems …
they should all have editorial… spend like 1-2 hours on a problem then look at editorial and try to understand it and implement every single one.
Here,Tutorials and some practice problems are there for almost each and every topic
https://discuss.codechef.com/questions/48877/data-structures-and-algorithms
And you better follow code monk series which starts at the beginning of every academic year as they host contests(topic wise) on every topic with a gap of one or two weeks.If you follow code monk series then you will will improve a lot and you can be able to solve every standard problem.
Here are some links, that might seem helpful to you.
http://codeforces.com/blog/entry/23054
https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/
https://discuss.codechef.com/questions/48877/data-structures-and-algorithms
Give a search to forum first. Such a question has been abundantly and excellently answered before. 
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Anytime buddy !