CodingPartner Advanced

Advanced has 38 problems. Each one takes a template from Core and changes exactly one thing: the condition that keeps a window valid, the thing you binary-search over, or the state a DP carries.

Changing one thing at a time shows you which parts of a pattern stay fixed and which ones you're allowed to bend. That's the difference between remembering a solution and understanding a pattern. Each group links back to the Core problem it builds on, so you can compare them side by side.

Next comes Ultra, where nobody names the pattern for you.