Add Codeforces problems and solutions

[vishruth-s]

Add Codeforces problems and solutions

[babitha667]

@Vishruth-S can you please check my pr #465 , I will add some more from Codeforces ,codechef and leetcode if you like my work .

[waridrox]

Will be happy to contribute to problems of Codeforces :)

[Vishruth-S]

@waridrox Sure go ahead. This is open to anyone. Just be sure to read Contributing.md and adhere to all guidelines given there 😃

[subhakr11droy]

Hi @Vishruth-S,

Added a Div-1 problem from Codeforces, kindly look into the pr #203

Thanks,
Shubhakar

[Vishruth-S]

@subhakr11droy Merged 👍

[babitha667]

@Vishruth-S can I add my Codeforces solutions with questions

[Vishruth-S]

@babitha667 Sure. Please read Contributing.md before sending a Pull request.

[babitha667]

@Vishruth-S please review my pull request #487 , I have added the recent Codeforces contest question with explanation and my solution. I have solved 5 questions out of 7 in contest , I would like add all the solutions if u like my contribution :)