Cod sursa(job #2624715)

Utilizator UrsaWarlordFrincu Madalin Gabriel UrsaWarlord Data 5 iunie 2020 10:42:22
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <bits/stdc++.h>
using namespace std;

// 1: numere aleatorii
// 2: numere aproape sortate
// 3: numere sortate invers
// 4: numere aleatorii dar multe perechi de numere identice

void merge(int arr[], int l, int m, int r)
{

    int i,j,k;
    int n1 = m - l + 1;
    int n2 = r - m;
    int L[n1],R[n2];

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

    i = 0;
    j = 0;
    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)
    {
        int m = l+(r-l)/2; // overflow on (l+r)/2 big numbers
        mergeSort(arr,l,m);
        mergeSort(arr,m+1,r);
        merge(arr,l,m,r);
    }
}

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

int main()
{
    f >> N;
    int myvect[N];
    for(int i=0;i<N;i++)
        f >> myvect[i];
    mergeSort(myvect,0,N-1);
    for(int i=0;i<N;i++)
        g << myvect[i] << " ";
}