안선생의 개발 블로그
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#include<iostream>
using namespace std;
void swap(int* x, int* y)
{
int temp = *x;
*x = *y;
*y = temp;
}
void bubble(int a[], int n) //버블정렬
{
int i, j;
int flag = 0;
for (i = 0; i < n - 1; i++)
{
flag = 0;
for (j = 0; j < n - 1 - i; j++)
{
if (a[j] > a[j + 1])
{
swap(&a[j], &a[j + 1]);
flag = 1;
}
}
if (!flag) break;
}
}
void insertion(int a[], int n)
{
int i, j, x;
for (i = 1; i < n; i++)
{
j = i - 1;
x = a[i];
while (j > -1 && a[j] > x)
{
a[j + 1] = a[j];
j--;
}
a[j + 1] = x;
}
}
int partition(int a[], int l, int h)
{
int pivot = a[l];
int i = l, j = h;
do
{
do { i++; } while (a[i] <= pivot);
do { j--; } while (a[j] > pivot);
if (i < j)swap(&a[i], &a[j]);
} while (i < j);
swap(&a[l], &a[j]);
return j;
}
void quicksort(int a[], int l, int h)
{
int j;
if (l < h)
{
j = partition(a, l, h);
quicksort(a, l, j);
quicksort(a, j+1, h);
}
}
void selection(int a[], int n)
{
int i, j, k;
for (i = 0; i < n - 1; i++)
{
for (j = k = i; j < n; j++)
{
if (a[j] < a[k])
k = j;
}
swap(&a[i], &a[k]);
}
}
void merge(int a[], int l, int mid, int h)
{
int i=l, j=mid+1, k=l;
int b[100];
while (i <= mid && j <= h)
{
if (a[i] < a[j])
b[k++] = a[i++];
else
b[k++] = a[j++];
}
for (; i <= mid; i++)
b[k++] = a[i];
for (; j <= h; j++)
b[k++] = a[j];
for (int i = l; i <= h; i++)
a[i] = b[i];
}
void imergesort(int a[], int n)
{
int p, l, h, mid, i;
for (p = 2; p <= n; p = p * 2)
{
for (i = 0; i + p - 1 < n; i = i + p)
{
l = i;
h = i + p - 1;
mid = (l + h) / 2;
merge(a, l, mid, h);
}
}
if (p / 2 < n)
merge(a, 0, p / 2-1, n );
}
void mergesort(int a[], int l, int h)
{
int mid;
if (l < h)
{
mid = (l + h) / 2;
mergesort(a, l, mid);
mergesort(a, mid + 1, h);
merge(a, l, mid, h);
}
}
int findmax(int a[], int n)
{
int max = INT_MIN;
int i;
for (i = 0; i < n; i++)
{
if (a[i] > max)
max = a[i];
}
return max;
}
void countsort(int a[], int n) //
{
int i, j, max, * c;
max = findmax(a, n);
c = new int[max + 1];
for (i = 0; i < max + 1; i++)
{
c[i] = 0;
}
for (i = 0; i < n; i++)
{
c[a[i]]++;
}
i = j = 0;
while (j < max + 1)
{
if (c[j] > 0)
{
a[i++] = j;
c[j]--;
}
else
j++;
}
}
void shellsort(int a[], int n) //쉘정렬
{
int gap, i, j,temp;
for (gap = n / 2; gap >= 1; gap /= 2)
{
for (i = gap; i < n; i++)
{
temp = a[i];
j = i-gap;
while (j>= 0 && a[j] > temp)
{
a[j + gap] = a[j];
j = j - gap;
}
a[j + gap] = temp;
}
}
}
int main()
{
int a[] = { 3, 7,9,10,5,14},n=6;
shellsort(a, n);
for (int i = 0; i < n; i++)
cout << a[i] << " ";
return 0;
}
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