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(Pseudocode walkthrough)
Sort the three sides in ascending order: a ≤ b ≤ c Check if a + b > c If true, return valid If false, return invalid
Example: sides [3, 4, 5]. After sorting: 3, 4, 5. Check 3 + 4 > 5? Yes (7 > 5), so valid.
Example: sides [1, 2, 10]. After sorting: 1, 2, 10. Check 1 + 2 > 10? No (3 < 10), so invalid.
