BAC 2016 SIII Ex .4

#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("date.in");

int main()
{
    int x,p1=-1,p2=-1,i1=-1,i2=-1,ok=1;
    while(fin>>x){
        if(x%2==0){
         if(p1==-1){
            p1=x;
            p2=x;
         }
         else{
                p1=p2;
                p2=x;
            if(p1<=p2)
            {
               ok=0;
            }
         }
        }
        else
        {
            if(i1==-1)
            {
                i1=x;
                i2=x;
            }
            else
            {
                i1=i2;
                i2=x;
                if(i1>=i2)
                {
                   ok=0;
                }
            }
        }
    }
     /// (ok==1)? cout<<"DA": cout<<"NU";
     if(ok==1){
        cout<<"DA";

     }
     else
     {
         cout<<"NU";
     }
    return 0;
}