!等腰和等边输出一个即可

#include <iostream>
#include <cmath>
using namespace std;
int main(){
    double a, b, c; cin >> a >> b >> c;
    double maxv, minv;
    maxv = -1, minv = 100;
    maxv = max(a, max(b, c)), minv = min(a, min(b, c));
    b += a + c;
    a = maxv, c = minv, b -= (a + c);
    if(a >= b + c)  cout << "NAO FORMA TRIANGULO" << endl;
    else{
        if(a * a == b * b + c * c)   cout << "TRIANGULO RETANGULO" << endl;
        else if(a * a > b * b + c * c)  cout << "TRIANGULO OBTUSANGULO" << endl;
        else    cout << "TRIANGULO ACUTANGULO" << endl;
        if(a == b && b == c)    cout << "TRIANGULO EQUILATERO" << endl;
        else if(b == c || a == b) cout << "TRIANGULO ISOSCELES" << endl;
    }
    return 0;
}