Cod sursa(job #1251185)

Utilizator Impaler_009Mihai Nitu Impaler_009 Data 29 octombrie 2014 00:38:04
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.97 kb
#include <fstream>
#define maxn 500010

using namespace std;

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

int n,v[maxn],temp[maxn];

void mergesort (int p, int q)
{
    if (p == q)
      return;

    int mid = (p+q)/2;

    mergesort (p,mid);
    mergesort (mid+1,q);

    int i = p, j = mid+1, t = 0;

    while (i <= mid && j <= q)
    {
        if (v[i] <= v[j])
        {
            temp[++t] = v[i];
            ++i;
        }
        else
        {
            temp[++t] = v[j];
            ++j;
        }
    }

    if (i == mid+1)
    {
        for (; j <= q; ++j)
          temp[++t] = v[j];
    }
    else
    {
        for (; i <= mid; ++i)
          temp[++t] = v[i];
    }

    for (int i=p; i<=q; ++i)
    {
        v[i] = temp[i-p+1];
    }
}

int main()
{
    fin>>n;

    for (int i=1; i<=n; ++i)
      fin>>v[i];

    mergesort (1,n);

    for (int i=1; i<=n; ++i)
      fout<<v[i]<<" ";
}