题解 | 三角形判断

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int a,b,c;
    while(cin >> a >> b >> c){
        int arr[3]={a,b,c};
        sort(arr,arr+3);
        int a=arr[0],b=arr[1],c=arr[2];
        if(a+b>c){
            if(a==b&&b==c){
                cout << "Equilateral triangle!" << endl;
            }
            else if(a==b||b==c||a==c){
                cout << "Isosceles triangle!" << endl;
            }
            else{
                cout << "Ordinary triangle!" << endl; 
            }
        }
        else{
            cout << "Not a triangle!" << endl;
        }
    }
    return 0;
}