SDUT OnlineJudge

#include<iostream>
using namespace std;
void Quick_Sort(int *arr, int begin, int end);
int main()
{
    int n;
    cin>>n;
    int a[100000];
    for(int i = 0;i<n;i++)
    {
        cin>>a[i];
    }
    Quick_Sort(a,0,n-1);
    for(int i = 0;i<n;i++)
    {
        cout<<a[i]<<" ";
    }
    return 0;

}

void Quick_Sort(int *arr, int begin, int end){
    if(begin > end)
        return;
    int tmp = arr[begin];
    int i = begin;
    int j = end;
    while(i != j){
        while(arr[j] >= tmp && j > i)
            j--;
        while(arr[i] <= tmp && j > i)
            i++;
        if(j > i){
            int t = arr[i];
            arr[i] = arr[j];
            arr[j] = t;
        }
    }
    arr[begin] = arr[i];
    arr[i] = tmp;
    Quick_Sort(arr, begin, i-1);
    Quick_Sort(arr, i+1, end);
}