Browse 70 Array Coding Challenge
Build your foundation with array coding problems focused on two pointers, prefix sums, and subarrays. These are the basics that sharpen your problem-solving habits fast.
Problems (70 total)
About Array Problems
Arrays are where a huge chunk of coding problems begin. They look simple, but the moment you mix in indexing, traversal, sorting, prefix sums, or in-place updates, they become the base for a lot of interview classics and real-world coding challenges.
This category is all about getting comfortable with raw data laid out in order. That means knowing when to scan once, when to keep a running value, when to use two pointers, and when sorting the array first makes the whole problem easier. A lot of "hard-looking" questions become much more manageable once you stop treating the array like just a list of numbers and start treating it like structured input with patterns hiding inside it.
You'll see the usual suspects here: max/min tracking, prefix sums, subarrays, in-place swaps, deduping, and index-based tricks. Arrays are also the doorway into other patterns, so getting strong here pays off everywhere else. If you want to sharpen your fundamentals on Budibadu, array problems are one of the best places to start pushing yourself.
Budibadu provides array problems that build the kind of instincts you actually use later in binary search, sliding window, sorting, and dynamic programming. Take on a new coding challenge here and see how much cleaner your solutions get once you really understand how to work with ordered data.