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Quick Sort Template

Quick sort is one of the most fundamental algorithms.

Quick Start

Create a new post

1
$ hexo new "My New Post"

More info: Writing

Test

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$ hexo g && hexo s -p 8001

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$ hexo g && hexo d

quick sort

quick_sort.cppview raw
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#include <iostream>
using namespace std;

const int N = 100005;
int q[N];
int n;

void quick_sort(int q[], int l, int r){
if(l>=r) return;
int x = q[l], i=l-1, j = 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(){
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;
}