ClassQuiz, C++ (gcc)

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//g++  7.4.0
//////////////////////////////////////////////////////////////////////////////
//ClassQuiz
//quiz() code credit goes to thecleverprogrammer and SmallLion/Mr Unity Buddy of github
//rest of the code created by Rezaul Hoque on May 23,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////
#include <iostream>
class Quiz{
public:
void welcome (){
for (int k=0;k<35;k++){
std::cout<<">";
}
std::cout<<"\n";
for(int k=0;k<35;k++){
std::cout<<"<";
}
std::cout<<"\n";
std::cout<<"Welcome to the quiz!You have 3 questions.Each right answer will bring you 10.";

}
void multiCh(std::string x,std::string y,std::string z){
std::cout<<x<<","<<y<<","<<z<<"\n";
}
void quiz(){

std::string RightAns[]={"Everest","Amazon","Bering"};
int score=0;

std::string ans;
std::cout<<"What is the name of the highest peak of the world?\n";
multiCh("Alps","Mt. Everest","Kilimanjaro");
std::cin>>ans;
if (ans==RightAns[0])
 {
  std::cout<<" Right you are!\n";
 
  ++score;}
else
  {std::cout<<"That's not right\n";}

std::cout<<"Which one is the longest river on earth?\n";
multiCh("Ganges"," Mississippi "," Amazon");
std::cin>>ans;
if(ans==RightAns[1]){
  
  std::cout<<" Right you are!\n";
  
 ++score;
 }
else
  {std::cout<<"That's not right.\n";}

std::cout<<"Which strait lies between USA and Russia?\n";
multiCh("Palk","Hormuz","Bering");
std::cin>>ans;
if(ans==RightAns[2])
  {
  std::cout<<" Right you are!\n";
 ++score;}
else
  {std::cout<<"That's not right.\n";}

int m;
m=score*10;
std::cout<<"Your score is "<<m;
if(m<30)
  std::cout<<". Try better next time!\n";
else if(m==30)
 std::cout<<". Awesome!\n";
}
};

int main()
{
Quiz q;
q.welcome();
q.quiz();
return 0;
  
}

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Compilation time: 0.63 sec, absolute running time: 0.16 sec, cpu time: 0 sec, memory peak: 5 Mb, absolute service time: 0,9 sec