题解 | 三角形判断

#include <iostream>
using namespace std;

int main() {
    int a, b, c;
    while (cin >> a >> b >> c) {
        if (a + b > c && a + c > b && c + b > a) {
            if (a==b&&a==c) cout << "Equilateral triangle!" << endl;
            if ((a == b && a != c) || (a == c && a != b) || (b == c &&
                    b != a))cout << "Isosceles triangle!" << endl;
            if(a!=b&&a!=c&&b!=c) cout << "Ordinary triangle!" << endl;

        } 
        else cout << "Not a triangle!" << endl;
    }
    return 0;
}
// 64 位输出请用 printf("%lld")