Cod sursa(job #2507474)

Utilizator gabriel_froneaFronea Gabriel gabriel_fronea Data 10 decembrie 2019 12:23:12
Problema Sortare prin comparare Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>

using namespace std;

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

int v[500001];

void partitie3(int v[], int st, int dr, int &p1, int &p2)
{
    p1=st;
    p2=dr-1;
    int i=st;
    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, p2+1, dr);
}

int main()
{
    int n;
    in>>n;
    int st=0;
    int dr=n-1;
    for(int i=0; i<n; i++)
    {
        in>>v[i];
    }
    qs(v, st, dr);
    for(int i=0; i<n; i++)
    {
        out<<v[i]<<" ";
    }
    return 0;
}