Can anyone please guide how to match two string whether previous already inputted

Given n, which is the number of strings taken as input. For each input use have to print “YES” or “NO” whether the current string is already present or not.

Input:
5
Geeks
Hello
Great
Geeks
Hello
Output:

No
No
No
Yes
Yes

What I have tried:

bool isSubSequence(char str1[], char str2[], int m, int n)
{
    // Base Cases
    if (m == 0) return true;
    if (n == 0) return false;
 
    // If last characters of two strings are matching
    if (str1[m-1] == str2[n-1])
        return isSubSequence(str1, str2, m-1, n-1);
 
    // If last characters are not matching
    return isSubSequence(str1, str2, m, n-1);
}

Tags: C, Java