@Arjun Sir I think its not rght to say best case as Min(m,n). It depnds like if m>n and whichever side will contain smaller values will be finished first. It may be m or n not always minimum.. ryt sir?

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+33 votes

Best answer

+12 votes

A : 10 20 30 90

B. : 40 50 60 70

Suppose A.length =m ,B.length=n

Here m+n-1 comparisons are required

So O(m+n)//this is one of the worst case comparison

B. : 40 50 60 70

Suppose A.length =m ,B.length=n

Here m+n-1 comparisons are required

So O(m+n)//this is one of the worst case comparison

+8 votes

If there are 2 arrays like this

A: 10 20 60 90

B: 30 50 70 100

And store the resultent array in C[ ]

while((a[]!=NULL) && (b[]!=NULL)) { if((a[i]<b[j])||(b[j]==NULL)) { c[k++]=a[i++]; } else { c[k++]=b[j++]; } }

+8 votes

@srestha, kindly notice that in question its written two sorted list, not array.

in this case,

best case:- all elements of 2nd list is greater than that of 1st list then minimum comparison is Min(m,n) as it will take only one iteration.for comparison rest will be inserted as it is.

and worst case:- let 2 sorted list be 1,2,3,4 and 1,2,3,4 so here total comparison for merging should be =7(last element need not be compared) so total comparison= m+n-1= O(m+n).

in this case,

best case:- all elements of 2nd list is greater than that of 1st list then minimum comparison is Min(m,n) as it will take only one iteration.for comparison rest will be inserted as it is.

and worst case:- let 2 sorted list be 1,2,3,4 and 1,2,3,4 so here total comparison for merging should be =7(last element need not be compared) so total comparison= m+n-1= O(m+n).

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