Cod sursa(job #2600402)

Utilizator As932Stanciu Andreea As932 Data 12 aprilie 2020 15:32:34
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");

const int nmax=500005;

int n,a[nmax],b[nmax];

void read()
{
    fin>>n;

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

void mergeLR(int l,int r,int mid)
{
    int i=l,j=mid+1;
    int ni=mid,nj=r;
    int k=l;

    while(i<=ni && j<=nj)
        if(a[i]<=a[j])
            b[k++]=a[i++];
        else
            b[k++]=a[j++];

    while(i<=ni)
        b[k++]=a[i++];

    while(j<=nj)
        b[k++]=a[j++];

    for(int in=l;in<=r;in++)
        a[in]=b[in];
}

void merge_sort(int l,int r)
{
    int mid=(l+r)/2;

    if(l==r)
        return;

    merge_sort(l,mid);
    merge_sort(mid+1,r);

    mergeLR(l,r,mid);
}

void print()
{
    for(int i=1;i<=n;i++)
        fout<<a[i]<<" ";
}

int main()
{
    read();
    merge_sort(1,n);
    print();

    return 0;
}