快速排序

#include<iostream>
#include<time.h>
#include<stdlib.h>
using namespace std;

#define N 15

void print(int a[],int n)
{
	int i=1;
	while(i<=N)
	{
		cout<<a[i]<<" ";
		i++;
	}
	cout<<endl;
}

void s_swap(int &a,int &b)
{
	int t=a;
	a=b;
	b=t;
}

int s_less(int &a,int &b)
{
	return a<b?1:0;
}

int partion_v1(int a[],int l,int r)
{
	int i=l-1;
	int j=r;
	int v = a[r];
	
	while(1)
	{
		while(s_less(a[++i],v));
		while(s_less(v,a[--j]))
		{
			if(j==l)
			{
				break;
			}
		}

		if(i>=j){
			break;
		}

		s_swap(a[i],a[j]);
	}
		
	return i;	
}

int partion(int a[],int l,int r)
{
	int x=a[r];
	int i=l-1;
	
	for(int j=l;j<r;j++)
	{
		if(x>=a[j]){
			i++;
			s_swap(a[i],a[j]);
		}
	}
	s_swap(a[i+1],a[r]);

	return i+1;
}

void quicksort(int a[],int l,int r)
{
	if(l<r)
	{
		int p=partion(a,l,r);	
		quicksort(a,l,p-1);
		quicksort(a,p+1,r);
	}
}

void quicksort_v1(int a[],int l,int r)
{
	if(r<=l){
		return;
	}
	
	int p=partion_v1(a,l,r);	
	quicksort(a,l,p-1);
	quicksort(a,p+1,r);
	
}

int main()
{
	int a[N+1];
	srand(time(0));
	for(int i=1;i<=N;i++)
	{
		a[i] = rand()%(100*N);
	}

	quicksort_v1(a,1,N);

	print(a,N);

	return 0;
}