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📜 WAYPOINT LESSON

Checkpoint: Robustness

⭐ beginner⏳ 15 min read📍 Lesson 51 of 204

One graded challenge: throw exactly where the contract breaks, and survive the boundary tests.

Checkpoint — robustness. Pass the graded challenge below to finish the module.

The functions must throw std::invalid_argument/std::out_of_range on exactly the documented bad inputs — the tests use CHECK_THROWS for those and normal checks for the good paths.