The last page of the course is a contest: eight problems, roughly from easiest to hardest, that together use everything from Week 1 to Week 11 — input and output, conditions, loops, arrays, strings, sorting, a stack and a set. The first six are here, and the last two are on AtCoder. Give yourself three hours, and play it like a real contest:
- Read every problem first. Five minutes for all eight: the order is only a guess at the difficulty, and the problem that looks easiest to you is the one to start with.
- Solve the easiest first. An early accepted problem calms you down and banks points.
- Check the limits before you code: the types, and the speed.
- Test the edge cases before you submit, not after a wrong answer: n = 1, the largest values, the "no answer" case.
- Stuck for twenty minutes? Move on, and come back later with fresh eyes.
Good luck — and congratulations on reaching the end of the course.