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What is the number of comparisons required to extract 45th element of the min heap?
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O(1) or$\left ( 2^{45}-1 \right )$

if it is min heap and u r searching from root
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As here 45 i.e. a constant value is given , comparison will also be constant

right?
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mam, i hope his ( Rustam Ali ) doubt is, how you say it is ( 245 - 1).

Bye the way did you assume the root height = 1 ?

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@Shaik

why height will need here?

We only need no of comparison

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then how you got 245 -1

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@Shaik

draw this heap tree

1,4,2,5,6,7,3

See the number of comparison to find 3rd minimum is $2^{3}-1$ or not??
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that is in-directly referring height, when height of root=1

if height of root=0, then it would be 2(h-1) - 1

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or u can say  level
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sorry mam, it is level only... by taking height it will create more complexity
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for height it will be

$2^{h+1}-1$
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Time complexity will not be O (logn)?????

@srestha
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for the 45th minimumm in heap total uumber of comparisons =sum of first 44 natural numbers=44*45/2=990