HDU 4861（多校）1001 Couple doubi

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

long long  k,p;
int main()
{
    while(~scanf("%I64d%I64d",&k,&p))
    {
        int s=0;
        if(p==2)
        {
           if(((k+1)/2%2))
              cout<<"YES"<<endl;
           else
              cout<<"NO"<<endl;
           continue;
        }
        s=k/(p-1);
        if(s%2)
            cout<<"YES"<<endl;
        else
            cout<<"NO"<<endl;
    }
    return 0;
}

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

long long  k,p;
int main()
{
    while(~scanf("%I64d%I64d",&k,&p))
    {
        int s=k/(p-1);
        if(s%2)
            cout<<"YES"<<endl;
        else
            cout<<"NO"<<endl;
    }
    return 0;
}