#include <iostream>
#include <algorithm>
using namespace std;
int pow(int x)
{
    return x * x;
}
int main()
{
    int a , b , c;
    cin >> a >> b >> c;
    int t[4] = {0 , a , b , c};
    sort(t + 1 , t + 3 + 1);
    if(t[1] + t[2] < t[3])
    {
        cout << "Not triangle" << endl;
        return 0;
    }
    if(pow(t[1]) + pow(t[2]) == pow(t[3]))
    {
        cout << "Right triangle" << endl;
    }
    else if(pow(t[1]) + pow(t[2]) > pow(t[3]))
    {
        cout << "Acute triangle" << endl;
    }
    else if(pow(t[1]) + pow(t[2]) < pow(t[3]))
    {
        cout << "Obtuse triangle" << endl;
    }
    if(t[1] == t[2] || t[1] == t[3] || t[2] == t[3])
    {
        cout << "Isosceles triangle" << endl;
    }
    if(t[1] == t[2] && t[2] == t[3])
    {
        cout << "Equilateral triangle" << endl;
    }
    return 0;
}

讨论版看了好久，但是看了很多跟我一样83卡最后一个的也还是没懂自己的哪里错了555 求dalao解惑