Cod sursa(job #2507492)

Utilizator Alexandra_GheAlexandra Gheorghe Alexandra_Ghe Data 10 decembrie 2019 12:43:30
Problema Sortare prin comparare Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <iostream>
#include <fstream>

using namespace std;

ifstream in("algsort.in");
ofstream out("algsort.out");

int v[500000];

void partitie3 (int v[],int st, int dr, int &p1,int &p2)
{
    p1=st;
    p2=dr-1;
    for(int i=st; i<=p2; )
    {
        if(v[i]<v[dr])
        {
            swap(v[i],v[p1++]);
            i++;
        }
        else if(v[i]>v[dr])
        {
            swap(v[i],v[p2--]);
        }
        else i++;
    }
    swap (v[dr],v[++p2]);
}

void qs(int v[],int st,int dr)
{
    if(st>=dr)
    {
        return;
    }
    int p1,p2;
    partitie3(v,st,dr,p1,p2);
    qs(v,st,p1-1);
    qs(v,p1+1,dr);
}

int main()
{
    int n,i;
    in>>n;
    for(i=0; i<n; i++)
    {
        in>>v[i];
    }
    for(i=n; i>0; i--)
    {
        int p=rand()%i;
        swap(v[i-1],v[p]);
    }
    qs(v,0,n-1);
    for(i=0; i<n; i++)
    {
        out<<v[i]<<" ";
    }
}