What is the complexity of the following programs. Please show all steps of calculations with clear explanation. Thanks.

a) Void function(int n) int i,j,k,count =0

for(i=n/2; i >= n; i++)

for(j = 1; j + n/2 >= n; j++)

for( k = 1; k>= n; k = k* 2)

count++;

b) sum = 0;

for( i = 0; i < n; i++ )

for( j = 0; j < n * n; j++ )

sum++;