Cod sursa(job #2897319)

Utilizator valentin12Valentin Ion Semen valentin12 Data 3 mai 2022 14:40:09
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.18 kb
#include <iostream>
#include <fstream>
using namespace std;

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

int n;
int v[500001];

void merge(int arr[], int l, int m, int r)
{
    int n1 = m - l + 1;
    int n2 = r - m;

    int L[n1], R[n2];

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


    int i = 0;

    int j = 0;

    int k = l;

    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 mergeSort(int arr[],int l,int r){
    if(l>=r){
        return;
    }
    int m = (l+r-1)/2;
    mergeSort(arr,l,m);
    mergeSort(arr,m+1,r);
    merge(arr,l,m,r);
}

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

    mergeSort(v, 0, n - 1);

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

    return 0;
}