added codeforces problem solution

[Lokeshsharma1703]

Please place an x inside the [brackets] in the checklist below

Make sure all the item in the checklist have been done before making the PR

• [x ] You have starred the repo
• [x ] If you have added a new folder, there are no spaces in the name of the folder
• [x ] The link to the problem set is present on the first line of the code file
• [ x] Your code (solution) in your code file(s) is accepted by the problemset on CodeForces

[virejdasani]

Please remove the _ and make it consistent with all the other folders in this repo

[Lokeshsharma1703]

updated code according to your instructions