Are the below statements true about skiplists?
In a sorted set of elements skip lists can implement the below operations
I. given a element find closest element to the given value in the sorted set in O(logn) II. find the number of elements in the set whose values fall a given range in O(logn)
For example consider a 2 level skip list. the level-2 skip list can skip one node on a average and at some places may skip 2 nodes, depending on probabilities. this ensures O(logn).
Workspace
NA
SHSTTON
20
Solv. Corr.
127
Solv. In. Corr.
147
Attempted
0 M:0 S
Avg. Time
43 / 48
Choose the correct option.
What are the disadvantages in implementing buddy system algorithm for free lists ?
Ainternal fragmentation
Bwe no more have the hole lists in order of memory address, so it is difficult to detect if 2 holes remain adjacent in memory and shall be merged into one hole
In Move-To-front Method the element which is searched is moved to the head of the list. And if a node is searched even once, it is moved to the head of the list and given maximum priority even if it is not going to be accessed frequently in the future. Such a situation is referred to as over-rewarding.
Workspace
NA
SHSTTON
49
Solv. Corr.
130
Solv. In. Corr.
179
Attempted
0 M:0 S
Avg. Time
45 / 48
Choose the correct option.
Which of the following data structure is preferred to have lesser search time when the list size is small?
Self-organizing list is easy and simple to implement than search tree and it requires no additional space. So using self organizing list is preferred when list size is small.
Workspace
NA
SHSTTON
81
Solv. Corr.
59
Solv. In. Corr.
140
Attempted
0 M:0 S
Avg. Time
46 / 48
Choose the correct option.
What is buddy memory management of free lists ?
Amodified version of first fit
Bmodified version of best fit
Cbuddy allocation keeps several free lists, each one holds blocks which are of one particular size
When an allocation request is received, the list that holds blocks that are just large enough to satisfy the request are considered, and an open location is returned. If no free blocks that are smaller than two times the size that are requested are available, a larger block is split in two to satisfy the requirements.
Workspace
NA
SHSTTON
58
Solv. Corr.
60
Solv. In. Corr.
118
Attempted
0 M:0 S
Avg. Time
47 / 48
Choose the correct option.
Assume there is a free list which contains nodes and is filled with a value if it is already assigned and the value will be the size of requested block else will be 0. The below code represents what ?
z = startpoint;
while ((z < end) && (*z <= len))
{
assign this block
}
As z is start point and now from beginning we are moving and checking if we reached end and then checking size naively assigning the first block which is bigger than required size hence it is first fit.
Workspace
NA
SHSTTON
65
Solv. Corr.
78
Solv. In. Corr.
143
Attempted
0 M:0 S
Avg. Time
48 / 48
Choose the correct option.
How does implicit free lists(garbage collection) works in adding memory to free list ?
Awhichever comes last will be added to free list
Bcertain blocks cannot be used if there are no pointers to them and hence they can be freed
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