#include<iostream>
using namespace std;

//判断是否是直角三角形 
bool isHardTriangle(int a,int b,int c);

int main()
{
    while(true)
    {
        cout<<"请输入三角形三边"<<endl;

        int a,b,c;
        cin>>a>>b>>c;

        if(isHardTriangle(a,b,c)==true)
        {
            cout<<"是直角三角形"<<endl<<endl;
        }
        else
        {
            cout<<"不是直角三角形"<<endl<<endl;
        }       
    } 



    return 0;
} 

bool isHardTriangle(int a,int b,int c)
{
    bool isHardTriangle=false;

    //求三条边中最大值 
    int max;
    max=a>b?a:b;
    max=max>c?max:c;

    if(a==max) 
    {
        if(a*a==b*b+c*c)
        {
            isHardTriangle=true;
        }
    }
    else if(b==max)
    {
        if(b*b==a*a+c*c)
        {
            isHardTriangle=true;    
        }
    }
    else
    {
        if(c*c==a*a+b*b)
        {
            isHardTriangle=true;    
        }   
    }

    return isHardTriangle;
}