Cod sursa(job #1879886)

Utilizator alexdaduBucurica Alexandru alexdadu Data 15 februarie 2017 10:56:54
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>

using namespace std;

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

int n,a[500010], b[500010];

void interclasare(int st, int mij, int dr)
{
    int i,j,k,t;

    for(i=st; i<=dr; i++)
        b[i]=a[i];

    i=st; k=st-1; j=mij+1;

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

    for(t=i; t<=mij; t++)
        a[++k]=b[t];
    for(t=j; t<=dr; t++)
        a[++k]=b[t];
}


void mergesort(int st, int dr)
{
    int mij;
    if(st<dr)
    {
        mij=(st+dr)/2;
        mergesort(st,mij);
        mergesort(mij+1, dr);
        interclasare(st,mij,dr);
    }
}


int main()
{
    int i;
    in>>n;
    for(i=1; i<=n; i++)
        in>>a[i];
    mergesort(1,n);

    for(i=1; i<=n; i++)
        out<<a[i]<<" ";

    return 0;
}