题解 | #三角形判断#

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

int main() 
{
    vector<int> arr;
    arr.resize(3, 0);
    while(cin >> arr[0] >> arr[1] >> arr[2])
    {
        sort(arr.begin(), arr.end());

        if(arr[0] + arr[1] > arr[2])
        {
            if(arr[0] == arr[2])
                cout << "Equilateral triangle!" << '\n';
            else if(arr[0] == arr[1] || arr[1] == arr[2])
                cout << "Isosceles triangle!" << '\n';
            else
                cout << "Ordinary triangle!" << '\n';
        }
        else
        {
            cout << "Not a triangle!" << '\n';
        }
    }

    
    return 0;
}