#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c; cin>>a>>b>>c; if(a>c)swap(a,c); if(b>c)swap(b,c); if(a>c)swap(a,c); if(b>c)swap(b,c); if(a+b<=c){ cout<<"Not triangle"; exit(0); } if(pow(a,2)+pow(b,2)pow(c,2))cout<<"Right triangle"<<endl; if(pow(a,2)+pow(b,2)>pow(c,2))cout<<"Acute triangle"<<endl; if(pow(a,2)+pow(b,2)<pow(c,2))cout<<"Obtuse triangle"<<endl; if(ab||ac||bc)cout<<"Isosceles triangle"<<endl; if(ab&&bc)cout<<"Equilateral triangle"<<endl; return 0; } 代码有点儿长，嘿嘿嘿