Cod sursa(job #2082211)

Utilizator Cristian25Cristian Stanciu Cristian25 Data 5 decembrie 2017 20:28:56
Problema Sortare prin comparare Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 1.08 kb
#include <iostream>
#include <fstream>

using namespace std;
ifstream in("algsort.in");
ofstream out("algsort.out");
int a[500001],N;
void inter(int st,int dr,int mij)
{
    int i,j,k,b[100];
    i=st;
    j=mij+1;
    k=1;
    while(i<=mij && j<=dr)
    {
        if(a[i]<a[j])
        {
            b[k]=a[i];
            ++i;
        }
        else
        {
            b[k]=a[j];
            ++j;
        }
        ++k;
    }
    if(i<=mij)
        while(i<=mij)
        {
            b[k]=a[i];
            ++i;
            ++k;
        }
    else if(j<=dr)
        while(j<=dr)
        {
            b[k]=a[j];
            ++j;
            ++k;
        }
    for(k=1,i=st;i<=dr;++k,++i)
        a[i]=b[k];
}
void MergeSort(int st,int dr)
{
    if(st<dr)
    {
        int mij=(st+dr)/2;
        MergeSort(st,mij);
        MergeSort(mij+1,dr);
        inter(st,dr,mij);
    }
}
int main()
{
    in>>N;
    for(int i=1;i<=N;++i)
        in>>a[i];
    MergeSort(1,N);
    for(int i=1;i<=N;++i)
        out<<a[i]<<' ';
    return 0;
}