C :: Read In N / Then N Words And Check To See If First Word Is Repeated

Read in n, then n lastnames, and check to see if the first in the list is ever repeated again.Here's what I have so far:

Code:

#include <stdio.h>
#include <stdlib.h>
int strcmp(char *w1, char *w2);
int main() {
int j, n;
char string1[30], string2[30];
}

[code]....

I see the problem is that it lies within n amount of string that I am not going through every string to compare to the first one.How will do compare every string to the first one?

Current output:
3
alex
alex
alex
Not repeated

3
alex
ash
peter
Not repeated