Added 2 new sources in problem-sets-competitive-programming.md (#10556)

* Update problem-sets-competitive-programming.md

Added 2 new sites for competitive programming  problem sets.

* create ladders and add appropriate links

* Update problem-sets-competitive-programming.md
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* [CTF Capture the Flag](#capture-the-flag)
* [Data science](#data-science)
* [HTML and CSS](#html-and-css)
* [Ladders](#ladders)
* [Problem Sets](#problem-sets)
@ -44,7 +45,6 @@
* [oj.uz](https://oj.uz)
* [Sigmageek](https://sigmageek.com)
* [Sphere Online Judge](http://www.spoj.com/contests)
* [Strivers CP Sheet](https://takeuforward.org/interview-experience/strivers-cp-sheet/)
* [Techgig](https://www.techgig.com)
* [Topcoder](https://www.topcoder.com)
* [Toph](https://toph.co)
@ -82,10 +82,18 @@
* [Frontend Mentor](https://www.frontendmentor.io/challenges?languages=CSS&sort=difficulty%7Casc&type=free) *(email address requested)*
### Ladders
* [A2 Online Judge](https://a2oj.netlify.app)
* [Atcoder Problems](https://kenkoooo.com/atcoder/#/table)
* [C2 Ladders](https://c2-ladders-juol.onrender.com)
* [Striver's A2Z DSA Course/sheet](https://takeuforward.org/strivers-a2z-dsa-course/strivers-a2z-dsa-course-sheet-2)
* [Strivers CP Sheet](https://takeuforward.org/interview-experience/strivers-cp-sheet/)
### Problem Sets
* [500 Data structures and algorithms interview questions and their solutions in C++](https://www.quora.com/q/techiedelight/500-Data-Structures-and-Algorithms-interview-questions-and-their-solutions)
* [A2 Online Judge](https://a2oj.netlify.app)
* [Advent Of Code](http://adventofcode.com)
* [AdventJS - 25 días de retos con JavaScript](https://adventjs.dev) - Miguel Ángel Durán «midudev» *(GitHub account requested, not required)*
* [Anarchy Golf](http://golf.shinh.org)
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* [Python Practice Projects](http://pythonpracticeprojects.com)
* [Rosalind](http://rosalind.info/problems/locations/)
* [Sphere Online Judge](http://www.spoj.com/problems/classical)
* [Striver's A2Z DSA Course/sheet](https://takeuforward.org/strivers-a2z-dsa-course/strivers-a2z-dsa-course-sheet-2)
* [TalentBuddy](http://www.talentbuddy.co/blog/)
* [The Ultimate Topic List(with Tutorials, Problems, and Templates)](https://blog.shahjalalshohag.com/topic-list/) - Shahjalal Shohag
* [Timus Online Judge](http://acm.timus.ru)