Foreign Exchange (UVA - 10763)

#include 
#include 
#define maxn 500002
using namespace std;

int N1[maxn];
int N2[maxn];

int main()
{
    int n;
    int a,b;
    while(cin>>n&&n!=0)
    {
        int ok = 1;
        for(int i = 0;i>N1[i]>>N2[i];
        }
        if(n%2)
        {
            cout<<"NO"<