Given code, what is the running time in terms of big O / big ? Please mention operations

int sample_code_01 (int n) {

int s = 0;

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

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

++s;

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

++s;

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

++s;

}

return s;

}

int sample_code_02 (int n) {

int s = 0;

s += sample_code_01(n) * sample_code_01(n); // Above

s += sample_code_01(n/2);

return s;

}

int sample_code_03 (int n) {

int s = 0;

int t = 0;

while (t < n * n * n) {

for (int i = n; i > 0; i--)

s++;

for (int i = n; i > 1; i = i/2)

s++;

t += 2;

}

return s;

}

int sample_code_04 (int n) {

int s = 0;

int t = n;

while (t > 1) {

int u = 0;

while (u < n/2)

u++;

S++;

u = n / 2;

while (u > 0) {

u--;

s++;

}

t = t / 2;

}

return s;

}