```cpp
include[HTML_REMOVED]
include[HTML_REMOVED]
using namespace std;
int main(){
double a,b,c,t,s;
cin>>a>>b>>c;
if(a<b){
t=a;
a=b;
b=t;}
if(a<c){
t=a;
a=c;
c=t;}
if(b<c){
t=b;
b=c;
c=t;}//注意题目要求降序依次为abc
if(a>=(b+c))
{
printf("NAO FORMA TRIANGULO\n");
}
else{ //要输出所有符合条件的句子,需要都用if语句,若用if-else if-else就只会输出第一个
if((a*a)>(b*b+c*c)){//注意关系符的优先级,不要忘了加括号
printf("TRIANGULO OBTUSANGULO\n");
}
if((a*a)==(b*b+c*c)){
printf("TRIANGULO RETANGULO\n");
}
if((a*a)<(b*b+c*c)){
printf("TRIANGULO ACUTANGULO\n");
}
if((a==b)&&(a==c)){
printf("TRIANGULO EQUILATERO\n");
}
if(((a==b)&&(a!=c))||((a==c)&&(a!=b))||((b==c)&&(b!=a))){
printf("TRIANGULO ISOSCELES\n");
}
}
return 0;
}