int main()
{
double a,b,c;
double A,B,C;
scanf(“%lf %lf %lf”,&a,&b,&c);

//替换
if(a<b){
    double t = a;
    a = b;
    b = t;
}
    if(a<c){
    double t = a;
    a = c;
    c = t;
}
    if(c>b){
    double t = c;
    c = b;
    b = t;
}

A = a;
B = b;
C = c;

if(A>=B+C){
    printf("NAO FORMA TRIANGULO");
}
else {
    if(A*A==B*B+C*C)
     printf("TRIANGULO RETANGULO\n");
     if(A*A>(B*B+C*C))
     printf("TRIANGULO OBTUSANGULO\n");
     if(A*A<(B*B+C*C))
     printf("TRIANGULO ACUTANGULO\n");
     if(A==B&&B==C){
        printf("TRIANGULO EQUILATERO\n"); 
     }
     else if(a==b||a==c||b==c)
        printf("TRIANGULO ISOSCELES\n");

}
return 0;

}

//注意相应的排序问题，替换