Give the order of growth (as a function of N ) of the running times of each of the. plz solve in (java)

following code fragments:

a. int sum = 0;

for (int n = N; n > 0; n /= 2)

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

sum++;

b. int sum = 0;

for (int i = 1 i < N; i *= 2)

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

sum++;

c. int sum = 0;

for (int i = 1 i < N; i *= 2)

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

sum++;