i have WA on test #3

my code here:

#include <iostream>
using namespace std;

int main()
{
    int n, s = 0;
    cin >> n;

    string *arr = new string[n];
    string a;
    getline(cin, a);
    for(int i = 0; i < n; i++)
    {
        getline(cin, a);
        for(int j = 0; j < i; j++)
        {
            if(a == arr[j])
            {
                s++;
                break;
            }
            else arr[i] = a;
        }
    }

    cout << s << endl;

    return 0;
}

Edited by author 26.01.2016 21:58