REALBIN - Editorial

Sad reacts only.
They should have mentioned to use fast IO or endl… just like CodeForces does.


Probably this: __builtin_popcount - Codeforces


Considering your example, a = 1 and b = 5. Let x = 1/5
Divyam can use the operations ‘add’ or ‘subtract’ in such a way that he can avoid 0 or 1.
If Chef gives him 1/5, then he can add it to make x = 2/5
Suppose again x = 1/5 is given, then he can subtract 1/5 from x and then x becomes 1/5.
So, no matter how many times you give 1/5, Divyam can go from 1/5 to 2/5 and then return to 1/5 again.


Thanks for pointing. I should have check the range for the function.
Got accepted.

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Can, anybody tell me how should I run this code in Java. I am getting TLE . In Java we don’t have endl to break the input .!!!

It was basically because of some endl nonsense . It gave accepted by using /n .

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Today I realized that endl is worse than logN, really !!!

No is missing

yeah… :expressionless:
lost a lot today bcoz of that stupid thing

same situation bro :frowning:


Why are you printing Yes in both case ?

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My solution was to see that whether denominator is a power of 2 or not i applied some complicated math to prove that and here is my solution

void solve()

unsigned long long int a,b;

    b = b/a;

if(ceil(log2(b)) == floor(log2(b)))


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I just checked if b is equal to some 2 power x (say) and if it exceeds it(b) then directly outputing no and going to next test case.
For reference : Submission

In addition to printing “No” in the second case you should use fast input output to get AC . Hope it helps!

I had the same check but instead of looping while dividing by 2, I went on to check the number of set bits in the denominator. If it is 1 => the denominator is a power of two. Used __builtin_popcountll() as well as a function for counting set bits. But the result was TLE in both cases.
i guess it was because of endl.

If a number ‘x’ is a power of 2 then the value of (x&(x-1)) == 0 always, I feel this is faster to do.

what happens when A=1 and B=5 then the X=1/5=0.2 then chef can provide Y=4/5=0.8 to make it 1 or Y=1/5=.2 to make it 0. ?

Then the o/p should be yes right?

I have thought that B should be a combination of 2s and 5s and if there is any other prime factors then the o/p should be “No” . Why should 5 not be considered?

I know this it is O(1) time complexity but it was not working for me i don’t know why .It was giving TLE