Cod sursa(job #2165794)

Utilizator PopeangaMihneaPopeanga Mihnea- Stefan PopeangaMihnea Data 13 martie 2018 13:41:14
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.34 kb
#include <bits/stdc++.h>

using namespace std;

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

int x[500001];
int n;

void interclasez(int st, int dr, int m)
{
    int i, j, k, aux[500001];
    i=st; j=m+1; k=st-1;
    while(i<=m && j<=dr)
    {
        if(x[i]<x[j])
        {
            aux[++k]=x[i];
            ++i;
        }
        else
        {
            aux[++k]=x[j];
            ++j;
        }
    }
    while(i<=m)
    {
        aux[++k]=x[i];
        ++i;
    }
    while(j<=dr)
    {
        aux[++k]=x[j];
        ++j;
    }
    for(int i=st; i<=dr; ++i) x[i]=aux[i];
}

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

void quicksort(int st, int dr)
{
    int i, j;
    int m=(st+dr)/2;
    int piv=x[m];
    i=st; j=dr;
    while(i<=j)
    {
        while(x[i]<piv) ++i;
        while(x[j]>piv) --j;
        if(i<=j)
        {
            swap(x[i], x[j]);
            ++i;
            --j;
        }
    }
    if(i<dr) quicksort(i, dr);
    if(j>st) quicksort(st, j);
}

int main()
{
    fin>>n;
    for(int i=1; i<=n; ++i) fin>>x[i];
    quicksort(1, n);
    for(int i=1; i<=n; ++i) fout<<x[i]<<" ";
    fout<<"\n";
    return 0;
}