Difficulty

Easy DSA Problems with Solutions

Foundational problems that take 10–20 minutes for a confident interviewer to solve. Start here.

Easy problems are the warm-ups — they exercise a single pattern in isolation (a hash map lookup, a single sliding window, one DFS) without combining patterns or fighting tricky edge cases. Master the easy tier first; it's the fastest way to internalize the canonical solution for each pattern. Every easy problem on Ratta ships with intuition, complexity analysis, and verified code in C++, Java, Python, and Go — so you can practice in your interview language and quickly verify your work.