MultiLevel Inheritence hacckerrank solution

 #include <cmath>

#include <cstdio>

#include <vector>

#include <iostream>

#include <algorithm>

using namespace std;

class Triangle{

public:

void triangle(){

cout<<"I am a triangle\n";

}

};

class Isosceles : public Triangle{

  public:

  void isosceles(){

    cout<<"I am an isosceles triangle\n";

  }

};

class Equilateral:public Isosceles

{

public:void equilateral(){cout<<"I am an equilateral triangle\n";}

};

//Write your code here.

int main(){

  

    Equilateral eqr;

    eqr.equilateral();

    eqr.isosceles();

    eqr.triangle();

    return 0;

}