快排

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;



int one[1000000];

void quickSort(int le, int ri){
    int key = one[le];
    int a=le, b=ri;
    while(a < b){
        while(one[b] >= key && a < b){
            b--;
        }
        one[a] = one[b];
        while(one[a] <= key && a < b){
            a++;
        }
        one[b] = one[a];
    }
    one[a] = key;
    if(le < a-1){
        quickSort(le, a-1);
    }
    if(ri > a+1){
        quickSort(a+1, ri);
    }
}


int main(){
    int n;
    while(cin >> n){
        for(int e=1; e <= n; e++){
            one[e] = rand()%10;
        }
        for(int e=1; e <= n; e++){
            printf("%d%c", one[e], e==n ? '\n':' ');
        }
        quickSort(1,n);
        for(int e=1; e <= n; e++){
            printf("%d%c", one[e], e==n ? '\n':' ');
        }
    }
    return 0;
}

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