Triangle Type

Lab C++ Intermediate 20 points

Read three side lengths and print invalid, equilateral, isosceles or scalene.

Input

Three integers.

Output

One word.

Example

Input

3 3 3

Output

equilateral

Sample input available Sample output available

Editor

C++

Hints

min({a, b, c}) and max({a, b, c}) work with an initializer list.

Solution explanation

Finding the smallest, middle and largest side avoids checking every order.

Show solution

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    int lo = min({a, b, c}), hi = max({a, b, c});
    int mid = a + b + c - lo - hi;
    if (lo + mid <= hi) cout << "invalid\n";
    else if (lo == hi) cout << "equilateral\n";
    else if (lo == mid || mid == hi) cout << "isosceles\n";
    else cout << "scalene\n";
    return 0;
}

Output

Answer