Cod sursa(job #3287983)

Utilizator Ionut_fltFilote Alexandru Ionut Ionut_flt Data 20 martie 2025 10:39:34
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <fstream>
#include <vector>
using namespace std;

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

int n;
vector<int> v;

void merge(vector<int> &arr, int left, int mid, int right)
{
    int n1 = mid - left + 1;
    int n2 = right - mid;

    vector<int> L(n1), R(n2);

    for (int i = 0; i < n1; i++)
        L[i] = arr[left + i];
    for (int j = 0; j < n2; j++)
        R[j] = arr[mid + 1 + j];

    int i = 0, j = 0, k = left;
    while (i < n1 && j < n2)
    {
        if (L[i] <= R[j])
        {
            arr[k] = L[i];
            i++;
        }
        else
        {
            arr[k] = R[j];
            j++;
        }
        k++;
    }

    while (i < n1)
    {
        arr[k] = L[i];
        i++;
        k++;
    }

    while (j < n2)
    {
        arr[k] = R[j];
        j++;
        k++;
    }
}

void merge_sort(vector<int> &arr, int left, int right)
{
    if (left < right)
    {
        int mid = left + (right - left) / 2;
        merge_sort(arr, left, mid);
        merge_sort(arr, mid + 1, right);
        merge(arr, left, mid, right);
    }
}

int main()
{
    f >> n;
    v.resize(n);

    for (int i = 0; i < n; i++)
        f >> v[i];

    merge_sort(v, 0, n - 1);

    for (int i = 0; i < n; i++)
        g << v[i] << " ";

    f.close();
    g.close();
    return 0;
}