/*--------------------------------------------------------*/
void quick_sort_1(float *list, int *index, int left_end, int right_end)
{
int i, j, temp;
float chosen;
chosen = list[index[(left_end + right_end)/2]];
i = left_end-1;
j = right_end+1;
for (;;)
{
while (list[index[++i]] < chosen);
{
while (list[index[--j]] > chosen);
if (i < j)
{
temp=index [j];
index [j] = index [i];
index [i] = temp;
}
else if (i == j)
{
++i;
break;
}
else break;
}
}
if (left_end < j) quick_sort_1(list, index, left_end, j);
if (i < right_end) quick_sort_1(list, index, i, right_end);
return;
}
void quick_sort_1(int a[], int l, int r) {
//整列する要素が一つなら終わり
int v;
if (l >= r) {
return;
}
v = partition(a, l, r);
quick_sort_1(a, l, v-1);
quick_sort_1(a, v+1, r);
}
/*--------------------------------------------------------*/
void quick_sort(float *list, int *index, int n)
{
int i;
for (i=0; i<n; i++) index[i]=i;
quick_sort_1(list, index, 0, n-1);
return;
}
static int quick_sort_1(int *arr, int l, int r, int size)
{
if (l >= r)
return -1;
int pivot = (l+r)/2;
//swap the pivot to end
swap_pivot(&arr[pivot], &arr[r]);
int left = l;
int right = r-1; //because the pivot swap to the end, so the right index need to decrease 1
while (/*left < right*/1)
{
while (less_than(arr[left], arr[r], &comp)) ++ left;
while(less_than(arr[r], arr[right], &comp)) -- right;
if (left < right)
{
int temp = arr[left];
arr[left] = arr[right];
arr[right] = temp;
++ left;
-- right;
++ swap_times;
}
else
break;
}
swap_pivot(&arr[r], &arr[left]);
for(int n = 0; n < size; ++n)
cout << arr[n] << " ";
cout<<endl;
quick_sort_1(arr, l, left-1, size);
quick_sort_1(arr, left+1, r, size);
return 0;
}
int quickSort_1(int *arr, int size)
{
comp = 0;
swap_times = 0;
rdirect out("D:\\output.txt");
cout<<"**************** Quick sort 1 **************************"<<endl;
quick_sort_1(arr, 0, size-1, size);
cout << "compare :" << comp << " times\n";
cout << "swap :" << swap_times << " times\n";
return 0;
}
void quick_sort(int a[], int n) {
quick_sort_1(a, 0, n-1);
}