Some of my recent searches over the internet are as follows,
- Introduction to Graphs: Definitions, Traversal, Depth-First Search - CodeChef Discuss
A very conceptual topic that every programmer at least skim through once (although just skimming doesn't give you any fruits). - NPTEL PHASE 2 - Courses
Something that should be taken as a online course by every single data-structures learner. - Computing Factorials of a huge number in C/C++: A tutorial - CodeChef Discuss
Huge number case study for those who are curious how these BigInt and other number manipulation libraries are build.