This is my answer.

#include<iostream> 
using namespace std; 
int main(){ 
int a,b,c; 
cin>>a>>b>>c; 
if(a+b>c&&a+c>b&&b+c>a){ 
if(a==c&&a==b&&c==b){ 
 cout<<"Equilateral Triangle"; 
}else if(a==b||a==c||b==c){ 
 cout<<"Isosceles Triangle"; 
}else if(a*a+b*b==c*c||c*c+b*b==a*a||a*a+c*c==b*b){ 
 cout<<"Right Triangle"; 
}else{ 
 cout<<"Simple Triangle"; 
} 
}else { 
cout<<"No"; 
} 

}