Visual C++ :: How To Make Random Array To Not Repeat

Here is my code for a simple game. paste it and try it.

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
using namespace std;
int main (void) {
stringg[4],

[code]...

What they do (enter 4 actions)?

";
for (int ai = 0; ai < 4; ai++)
getline(cin, a[ai]);
cout << "

Where is happening (enter 4 locations)?

";
for (int li = 0; li < 4; li++)
getline(cin, l[li]);
for (int c = 0; c < 4; c++)
cout << g[rand() % 4] << " and " << b[rand() % 4] << " are " << a[rand() % 4] << " from a " << l[rand() % 4] << endl;
return (0);
}

At the end in the 4 lines some of the names, actions and locations repeat. How do I make them to not repeat and use every name that you will enter? do I need random_shuffle? How can I integrate it in my code?