Cod sursa(job #1896906)

Utilizator flaviu_2001Craciun Ioan-Flaviu flaviu_2001 Data 28 februarie 2017 23:21:31
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.92 kb
#include <fstream>

using namespace std;

int n, v[500005];

void read()
{
    ifstream fin ("algsort.in");
    fin >> n;
    for (int i = 0; i < n; ++i)
        fin >> v[i];
    fin.close();
}

void write()
{
    ofstream fout ("algsort.out");
    for (int i = 0; i < n; ++i)
        fout << v[i] << " ";
    fout << "\n";
    fout.close();
}

void interclasare(int p, int m, int q)
{
    int r[n];
    int i = p, j = m+1, k = -1;
    while(i <= m && j <= q)
        if(v[i] < v[j])
            r[++k] = v[i++];
        else
            r[++k] = v[j++];
    while(i <= m)
        r[++k] = v[i++];
    while(j <= q)
        r[++k] = v[j++];
    for (int w = p; w <= q; ++w)
        v[w] = r[w-p];
}

void mergeSort(int p = 0, int q = n-1)
{
    if(q > p){
        int m = (p+q)/2;
        mergeSort(p, m);
        mergeSort(m+1, q);
        interclasare(p, m, q);
    }
}

int main()
{
    read();
    mergeSort();
    write();
    return 0;
}