0

Hi,

Is there anyone who know which complexity these functions are?

I mean O(n), O(n^2), O(n^3), n log(n) or log(n)

1.

---------------------------------------------

```
void bogosort_array(double a[], int length) {
do
shuffle_array(a, length);
while (! is_array_sorted(a, length));
}
```

2.

---------------------------------------------

```
void reverse_string(char* s) {
int n = strlen(s);
for (int i = 0; i < n / 2; ++i) {
char temp = s[i];
s[i] = s[n - i - 1];
s[n - i - 1] = temp;
}
}
```

3.

-------------------------------------------------------------

```
double arrays_are_equal(double a[], double b[], int length) {
for (int i = 0; i < length; ++i) {
if (a[i] != b[i]) {
return 0;
}
}
return 1;
}
```

4.

------------------------------------------------------------------------

```
int find_number_of_matches(int needles[], int haystack[], int length) {
int nr_matches = 0;
for (int n = 0; n < length; ++n) {
for (int h = 0; h < length; ++h) {
if (needles[n] == haystack[h]) {
++nr_matches;
}
}
}
return nr_matches;
}
```

5.

-------------------------------------------------------------------------

```
void sort_array(double a[], int length) {
for (int sorted = 0; sorted < length - 1; ++sorted) {
int smallest_in_rest = sorted;
for (int in_rest = sorted + 1; in_rest < length; ++in_rest) {
if (a[in_rest] < a[smallest_in_rest]) {
smallest_in_rest = in_rest;
}
}
double temp = a[sorted];
a[sorted] = a[smallest_in_rest];
a[smallest_in_rest] = temp;
}
}
```

6.

----------------------------------------------------------------------

```
void shuffle_array(double a[], int length) {
for (int randomized = 0; randomized < length; ++randomized) {
// Select a random position in the rest of the array
int selected = randomized + rand() % (length - randomized);
// Swap the current position with the random position
double oldvalue = a[randomized];
a[randomized] = a[selected];
a[selected] = oldvalue;
}
}
```

*Edited 6 Years Ago by Nick Evan*: Added CODE-tags