Cod sursa(job #1714010)

Utilizator valentinoMoldovan Rares valentino Data 7 iunie 2016 08:47:37
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.14 kb
#include <fstream>
#define NM 500010

using namespace std;

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

int v[NM], n;
void inter(int st, int dr, int mid);

void mergesort(int st, int dr)
{
    int mid;
    if(st < dr)
    {
        mid = (st + dr) >> 1;
        mergesort(st, mid);
        mergesort(mid + 1, dr);
        inter(st, dr, mid);
    }
    return;
}

void inter(int st, int dr, int mid)
{
    int i, j, k, b[NM];
    i = st;
    k = st;
    j = mid + 1;
    while(i <= mid && j <= dr)
    {
        if(v[i] < v[j])
        {
            b[k] = v[i];
            k++;
            i++;
        }
        else
        {
            b[k] = v[j];
            k++;
            j++;
        }
    }
    while(i <= mid)
    {
        b[k] = v[i];
        i++;
        k++;
    }
    while(j <= dr)
    {
        b[k] = v[j];
        j++;
        k++;
    }
    for(int i = st; i < k; ++i)
        v[i] = b[i];
}

int main()
{
    f >> n;
    for(int i = 1; i <= n; ++i)
        f >> v[i];
    mergesort(1, n);
    for(int i = 1; i <= n; ++i)
        g << v[i] << ' ';
    return 0;
}