Cod sursa(job #2625142)

Utilizator stefanst77Luca Stefan Ioan stefanst77 Data 5 iunie 2020 19:13:30
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.19 kb
#include <bits/stdc++.h>

using namespace std;

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

int a[500007], n;

void Interclasare(int st, int mij, int dr)
{
    int aux[dr - st + 7], k = 0;
    int i = st;
    int j = mij + 1;
    while(i <= mij && j <= dr)
    {
        if (a[i] < a[j])
            aux[++k] = a[i++];
        else
            aux[++k] = a[j++];
        /**
        if (a[i] > a[j])
            aux[++k] = a[j++];
        if (a[i] == a[j])
        {
            aux[++k] = a[i++];
            aux[++k] = a[j++];
        }
        */
    }
    while (i <= mij)
        aux[++k] = a[i++];
    while (j <= dr)
        aux[++k] = a[j++];

    for (i = 1; i <= k; i++)
        a[st + i - 1] = aux[i];
}

void MergeSort(int st, int dr)
{
    if (st < dr)
    {
        int mij = (st + dr) / 2;
        MergeSort(st, mij);
        MergeSort(mij + 1, dr);
        Interclasare(st, mij, dr);
    }
}

int main()
{
    fin >> n;
    for (int i = 1; i <= n; i++)
        fin >> a[i];
    fin.close();
    MergeSort(1, n);
    for (int i = 1; i <= n; i++)
        fout << a[i]  << " ";
    fout << "\n";
    fout.close();
    return 0;
}