快速排序

#include <iostream>

using namespace std;

const int N = 100010;
int q[N];

void quick_sort(int q[], int l, int r)
{
    if (l >= r) return;

    int i = l - 1;
    int j = r + 1;
    int x = q[l + r >> 1];

    while(i < j)
    {
        do i ++; while (q[i] < x);
        do j --; while (q[j] > x);
        if(i < j) swap(q[i], q[j]);
    }

    quick_sort(q, l, j);
    quick_sort(q, j + 1, r);
}

int main()
{
    int n;
    scanf("%d", &n);

    for (int i = 0; i < n; i ++)
    {
        scanf("%d", &q[i]);
    }

    quick_sort(q, 0, n - 1);

    for (int i = 0; i < n; i ++)
    {
        printf("%d ", q[i]);
    }

    return 0;
}

补代码拉！！！