Find big O for each:

a. for(int count = 0, i = 1; i < n; i *= 2)

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

count++;

b. for(int count = 0, i = 1; i < n; i * = 2)

for(int j = 0; j < i; j++)

count++;

c. for(int count = 0, i = 0; i < n * n; i++)

if( i % n == 0)

for(int j = 0; j < i; j++)

count++;