where is non-zero exit code in my code solving Bayan problem please help me
#include<iostream>
#include<cstring>

using namespace std;

int main()
{
    char nmat[1000][31];
    int no=0;
    int n;
    cin>>n;
    cin.ignore();
    if(1<=n&&n<=1000)
    {
    for(int i=0;i<n;i++)
        cin.getline(nmat[i],30);
    for(int i=1;i<n;i++)
    {
        for(int j=i-1;j>=0;j--)
        {
            if((strcmp(nmat[i],nmat[j]))==0)
            {
                no++;
                break;
            }
        }
    }



    cout<<no;
    }
    system("pause");
    return 0;
}