Type of triangle

Array Math Sorting

44.1% acceptance

Feb 25, 2026

458

You are given a 0-indexed integer array nums of size 3 which can form the sides of a triangle. A triangle is called equilateral if it has all sides of equal length. A triangle is called isosceles if it has exactly two sides of equal length. A triangle is called scalene if all its sides are of different lengths. Return a string representing the type of triangle that can be formed or "none" if it cannot form a triangle.

Solution

Rust

Time O(n log n)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn triangle_type(mut nums: Vec<i32>) -> String {
    nums.sort();
    if nums[0] + nums[1] <= nums[2] { return "none".to_string(); }
    if nums[0] == nums[2] { return "equilateral".to_string(); }
    if nums[0] == nums[1] || nums[1] == nums[2] { return "isosceles".to_string(); }
    "scalene".to_string()
  }
}