how to make the random array output not duplicate in c++? [duplicate]

so i have a project, this project is about the random things program. the problem is when I want to create a random team generator, using an array, the printed data is often the same or duplicate. how to solve this problem? is it still possible to use arrays?

#include <iostream>
#include <stdlib.h> 
#include <time.h> 


using namespace std;
int main() {
int a,b,c,d,e,f,i,random;
string name[100],g;
srand(time(0));


cout<<"enter the number of members : ";
cin>>a;
cout<<"enter the number of members per group : ";
cin>>b;
c = a / b;
cout<<"The number of groups is: "<< c <<endl;
for(e=0;e<a;e++){
    cout<< "Enter the Member's name of-" << e+1 << ": ";
    cin>> name[e];
}

for(d=0;d<c;d++){
    cout<<"Team"<< d+1<<endl;
    for(f=1;f<=b;f++){
        random = rand()%a;

        cout<< random[name]<<endl;

    }
}

}