정렬 C++
2021. 6. 1. 15:45ㆍStudy/CS
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#include <iostream>
using namespace std;
int *arr2;
void swap(int *arr,int a,int b)
{
int temp = arr[a];
arr[a] = arr[b];
arr[b] = temp;
}
void BubbleSort(int *arr,int len)
{
for(int i = len-1 ; i > 0 ; i--)
{
for(int j = 0 ; j < i ; j++)
{
if(arr[j] > arr[j+1])
{
swap(arr,j,j+1);
}
}
}
}
void SelectionSort(int *arr ,int len)
{
for(int i = 0 ; i < len-1 ; i++)
{
int selection = arr[i];
for(int j = i+1 ; j < len ; j++)
{
if(selection > arr[j])
{
selection = arr[j];
swap(arr, i,j);
}
}
}
}
void InsertionSort(int *arr ,int len)
{
for(int i = 1 ; i < len ; i++)
{
int key = arr[i];
int tmp = i-1;
while((tmp >= 0) && (arr[tmp] > key))
{
arr[tmp+1] = arr[tmp];
tmp--;
}
arr[tmp+1] = key;
}
}
void merge(int *arr ,int len ,int left, int right)
{
int mid = (left+right)/2;
int l = left;
int r = mid+1;
int idx = left;
while(l <= mid && r <= right)
{
if(arr[l] < arr[r])
{
arr2[idx++] = arr[l++];
}
else
{
arr2[idx++] = arr[r++];
}
}
int tmp = l > mid ? r : l;
while(idx <= right)
{
arr2[idx++] = arr[tmp++];
}
for(int i = left ; i <= right ; i++)
{
arr[i] = arr2[i];
//cout << arr[i] << " ";
}
//cout << endl;
}
//divide and conquer
void MergeSort(int *arr ,int len, int left, int right)
{
if(left < right)
{
int mid = (left+right)/2;
MergeSort(arr,len, left, mid);
MergeSort(arr,len, mid+1, right);
merge(arr,len,left,right);
}
}
void QuickSort(int *arr ,int left,int right)
{
if(left >= right) return;
int pivot = left;
int i = pivot + 1;
int j = right;
while(i <= j)
{
while(arr[pivot] > arr[i] && i <= right)
{
i++;
}
while(arr[pivot] < arr[j] && j >= left)
{
j--;
}
if(i <= j)
{
swap(arr,i,j);
}
else
{
swap(arr,pivot,j);
}
}
QuickSort(arr, left, j-1);
QuickSort(arr, j+1, right);
}
int main(int argc, const char * argv[]) {
int arr[] = {7,5,1,2,11,3,8,4,9};
int len = (sizeof(arr) / sizeof(int));
arr2 = new int[len];
//Bubble Sort
//BubbleSort(arr, len);
//Selection Sort
//SelectionSort(arr, len);
//Insertion Sort
//InsertionSort(arr, len);
//Merge Sort
//MergeSort(arr, len,0, len-1);
//Quick sort
//QuickSort(arr,0,len-1);
for(int i = 0 ; i < len ; i++)
{
cout << arr[i] << " ";
}
return 0;
}
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