diff --git a/problem-sets-competitive-programming.md b/problem-sets-competitive-programming.md
index 134d5d49e09d0fa620d1e75b394b702dd9eb0b88..5edf7f1ef3ed01f5f88fbce5338502bd7f6e8a45 100644
--- a/problem-sets-competitive-programming.md
+++ b/problem-sets-competitive-programming.md
@@ -38,6 +38,7 @@
 
 ### Problem Sets
 
+* [500 Data structures and algorithms interview questions and their solutions in C++](https://techiedelight.quora.com/500-Data-structures-and-algorithms-interview-questions-and-their-solutions-in-C%2B%2B)
 * [A2 Online Judge](https://a2oj.com/ps)
 * [Advent Of Code](http://adventofcode.com)
 * [Anarchy Golf](http://golf.shinh.org)