Two Numbers Question Doubt

Can anyone Please tell me the logic behind this question. I have just started Competitive Programming.
And was struggling in this question.Please Help…!

https://discuss.codechef.com/questions/102955/twonms-editorial

Read from here…you wil get it!

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Yeah, so see, after the contest is over, Again open the question and scroll down,
There you will find a link that says:EDITORIAL…
THat’s it…Editorial contains detailed explanation of the problem solving approach to the problem.!

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You ought to use search feature of the forums. Just write the Q code in it and it will give you ALL topics related to the Q.

Also, for any Q, editorial link is given in the section where it tells about problem setter and other details. Its just how things work here.

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if(n%2==1)
a=a*2;
(a>b)?(printf("%lld\n",a/b)):(printf("%lld\n",b/a));