請問個為大大要怎樣才不會TLE

#include<iostream>

using namespace std;
int main()
{
    int n;
    while(cin>>n)
    {
        string x[n];
        int y=0;
        for(int i=0;i<n;i++)
        {
            y=0;
            cin>>x[i];
            for(int j=0;j<i;j++)
            {
                if(x[i]==x[j])
                {
                    cout<<"Old! "<<j+1<<endl;
                    y=1;
                    break;
                }
            }
            if(y==0)
                cout<<"New! "<<i+1<<endl;
        }
    }
}