Cod sursa(job #1854264)

Utilizator Horia14Horia Banciu Horia14 Data 22 ianuarie 2017 15:32:39
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.98 kb
#include<cstdio>
#define NMAX 500002
using namespace std;

int a[NMAX], n;

void Read()
{
    FILE *fin = fopen("algsort.in","r");
    fscanf(fin,"%d",&n);
    for(int i=0; i<n; i++)
        fscanf(fin,"%d",&a[i]);
    fclose(fin);
}

inline void schimba(int i, int j)
{
    int aux = a[i];
    a[i] = a[j];
    a[j] = aux;
}

void QSort(int p, int q)
{
    int left = p, right = q, pivot = a[(p+q)>>1];
    while(left <= right)
    {
        while(a[left] < pivot) left++;
        while(a[right] > pivot) right--;
        if(left <= right)
        {
            schimba(left,right);
            left++;
            right--;
        }
    }
    if(p < right) QSort(p,right);
    if(left < q) QSort(left,q);
}

void Write()
{
    FILE *fout = fopen("algsort.out","w");
    for(int i=0; i<n; i++)
        fprintf(fout,"%d ",a[i]);
    fprintf(fout,"\n");
    fclose(fout);
}

int main()
{
    Read();
    QSort(0,n-1);
    Write();
    return 0;
}