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CodeChef --- Alternating Work Days


 There are three case

1.Equal day
2.Alice 1 day greater than Bob
3.Bob 1 day greater than Alice


///Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ll tst,a,b,p,q;
    cin>>tst;
    while(tst--)
    {
        cin>>a>>b>>p>>q;
        if(p%a==0 && q%b==0)
        {
            ll alice=ceil(p/a);
            ll bob=ceil(q/b);
            if(abs(alice-bob)<=1)
                cout<<"YES"<<endl;
            else
                cout<<"NO"<<endl;
        }
        else
            cout<<"NO"<<endl;
    }
    return 0;
}
///Alhamdulillah

problem link:https://www.codechef.com/LP2TO307/problems/ALTER
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