Today I have done leetcode's May LeetCoding Challenge with cpp.

May LeetCoding Challenge 19

Description

Type of Triangle

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.

Example 1:

Input: nums = [3,3,3]
Output: "equilateral"
Explanation: Since all the sides are of equal length, therefore, it will form an equilateral triangle.

Example 2:

Input: nums = [3,4,5]
Output: "scalene"
Explanation: 
nums[0] + nums[1] = 3 + 4 = 7, which is greater than nums[2] = 5.
nums[0] + nums[2] = 3 + 5 = 8, which is greater than nums[1] = 4.
nums[1] + nums[2] = 4 + 5 = 9, which is greater than nums[0] = 3. 
Since the sum of the two sides is greater than the third side for all three cases, therefore, it can form a triangle.
As all the sides are of different lengths, it will form a scalene triangle.

Constraints:

• nums.length == 3
• 1 <= nums[i] <= 100

Solution

class Solution {
public:
  string triangleType(vector<int>& nums) {
    sort(nums.begin(), nums.end());
    if(nums[0] + nums[1] <= nums[2]) return "none";
    if(nums[0] == nums[2]) return "equilateral";
    if(nums[0] == nums[1] || nums[1] == nums[2]) return "isosceles";
    return "scalene";
  }
};

// Accepted
// 704/704 cases passed (0 ms)
// Your runtime beats 100 % of cpp submissions
// Your memory usage beats 88.05 % of cpp submissions (22.8 MB)