Triangle Type Classifier

Hard ⏱ 18 min 39% acceptance ★★★★★ 4.9

Write a function triangle_type(a, b, c) that first checks whether the three side lengths form a valid triangle (see triangle inequality). If invalid, return "Not a triangle". Otherwise return "Equilateral" if all three sides are equal, "Isosceles" if exactly two sides are equal, or "Scalene" if all sides differ.

Examples

Example 1

Input

triangle_type(5, 5, 5)

Output

"Equilateral"

Explanation

All sides equal and forms a valid triangle.

Example 2

Input

triangle_type(5, 5, 8)

Output

"Isosceles"

Explanation

Two sides equal, valid triangle.

Example 3

Input

triangle_type(1, 1, 5)

Output

"Not a triangle"

Explanation

1+1 is not greater than 5.

Constraints

a, b, c are positive numbers.

Topics

Conditional Statementsnested conditionals

Companies

OracleDeloitte

Hints

Hint 1

Validate the triangle inequality before classifying the type.

Hint 2

Count how many of the three pairwise equalities hold, or compare directly with nested ifs.

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