Cod sursa(job #2553578)

Utilizator MarcGrecMarc Grec MarcGrec Data 22 februarie 2020 10:01:28
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.04 kb
#define MAX_N 500000

#include <fstream>
using namespace std;

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

int n, A[MAX_N + 1];

void MergeSort(int st, int dr);

int main()
{
    fin >> n;
    for (int i = 1; i <= n; ++i)
    {
        fin >> A[i];
    }

    MergeSort(1, n);

    for (int i = 1; i <= n; ++i)
    {
        fout << A[i] << ' ';
    }

    fin.close();
    fout.close();
    return 0;
}

int B[MAX_N + 1];
void MergeSort(int st, int dr)
{
    if (st == dr) { return; }

    int mij = (st + dr) / 2;
    MergeSort(st, mij);
    MergeSort(mij + 1, dr);

    int i = st, j = mij + 1, p = 0;
    while ((i <= mij) && (j <= dr))
    {
        if (A[i] < A[j])
        {
            B[++p] = A[i++];
        }
        else
        {
            B[++p] = A[j++];
        }
    }
    while (i <= mij)
    {
        B[++p] = A[i++];
    }
    while (j <= dr)
    {
        B[++p] = A[j++];
    }

    for (int i = st; i <= dr; ++i)
    {
        A[i] = B[i - st + 1];
    }
}