Cod sursa(job #1208219)

Utilizator Al3ks1002Alex Cociorva Al3ks1002 Data 15 iulie 2014 02:40:22
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.95 kb
#include<cstdio>
#include<fstream>
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<vector>
#include<bitset>
#include<deque>
#include<queue>
#include<set>
#include<map>
#include<cmath>
#include<cstring>
#include<ctime>
#include<cstdlib>

using namespace std;
const int nmax = 500005;

int n,i,a[nmax];

int partition(int l,int r)
{
    int x=a[rand()%(r-l+1)+l];
    int i=l-1;
    int j=r+1;

    for(;;)
    {
        do j--; while(a[j]>x);
        do i++; while(a[i]<x);

        if(i<j) swap(a[i],a[j]);
        else return j;
    }
}

void quicksort(int l,int r)
{
    if(l>=r) return;

    int x=partition(l,r);

    quicksort(l,x);
    quicksort(x+1,r);
}

int main()
{
    freopen("algsort.in","r",stdin);
    freopen("algsort.out","w",stdout);

    srand(time(0));

    scanf("%d",&n);

    for(i=1;i<=n;i++) scanf("%d",&a[i]);

    quicksort(1,n);

    for(i=1;i<=n;i++) printf("%d ",a[i]);

    return 0;
}