Cod sursa(job #1512646)

Utilizator andreiblaj17Andrei Blaj andreiblaj17 Data 28 octombrie 2015 13:55:41
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include <iostream>
#include <fstream>

#define nmax 500001

using namespace std;

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

int n;
int A[nmax];

void read();
void qs(int st, int dr);
void write();

int main()
{
    
    read();
    qs(1, n);
    write();
    
    return 0;
}

void read()
{
    fi >> n;
    for (int i = 1; i <= n; i++)
        fi >> A[i];
}

void qs(int st, int dr)
{
    
    if (st > dr)
        return;
    
    int pivot = A[(st + dr) >> 1];
    int i = st, j = dr;
    
    for (; i<=j;)
    {
        
        for (; A[i] < pivot;) i++;
        for (; A[j] > pivot;) j--;
        
        if (i <= j)
        {
            swap(A[i], A[j]);
            i++, j--;
        }
        
    }
    
    qs(st, j);
    qs(i, dr);
    
}

void write()
{
    for (int i = 1; i <= n; i++)
        fo << A[i] << " ";
}