Quicksort------代码之美

#include<iostream>
#include<cstdlib>
#include<time.h>
using namespace std;
void swap(const int a,const int b,int x[])
{
	int temp = x[a];
	x[a] = x[b];
	x[b] = temp;
}
void quicksort(int l, int u, int x[])//1.386nlgn 实际是二分搜索树
{

	int i, m;
	if (l >= u)return;
	swap(l, (rand() % (u - l + 1) + l),x);
	m = l;
	for (i = l + 1; i <= u; i++)
		if (x[i] < x[l])
			swap(++m, i, x);
	swap(l, m, x);
	quicksort(l, m - 1, x);
	quicksort(m + 1, u, x);
}
int main() {
	srand(time(0));
	int x[100];
	int p = 10;
	for (int i = 0; i < p; i++)
		cin >> x[i];
	quicksort(0, p-1, x);
	for (int i = 0; i <p; i++)
		cout << x[i] << endl;
}