I have access violation on the test 7! Help me, please! This is my code, sorry for my bad English!
#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    int a=0;
    int c=0;
    char nMatrix[100][31];
    char str[10];
    bool nArray[100];
    cin.getline(str,10);
    for(int i=0;i<n;i++)
    {
        cin.getline(nMatrix[i],31);
    }
    for(int i=0;i<n;i++)
    {
        nArray[i] = false;
    }
    for(int i=0;i<n;i++)
    {
        if(!nArray[i])
        {
            for(int j=i;j<n;j++)
            {
                if(strcmp(nMatrix[i],nMatrix[j])==0)
                {
                    nArray[j] = true;
                    a++;
                }
            }
        }
        if(a!=0) a--;
        c+=a;
        a=0;
    }
    cout<<c<<endl;
    return 0;
}

char nMatrix[1000][31];
 bool nArray[1000];

Thank you!!! I'm real lol))))