Cod sursa(job #1778236)

Utilizator moise_alexandruMoise Alexandru moise_alexandru Data 13 octombrie 2016 17:13:04
Problema Sortare prin comparare Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("algsort.in");
ofstream out("algsort.out");
const int maxn = 500005;
int a[maxn];
int b[maxn];
int v[maxn];
int n;

void interclasare(int st, int dr)
{
    int mij = (st + dr) / 2;
    int stx = st;
    int sty = mij + 1;
    for(int i = st; i <= mij; i++)
        a[i] = v[i];
    for(int i = mij + 1; i <= n; i++)
        b[i] = v[i];
    int poz = st - 1;
    while(stx <= mij && sty <= dr)
    {
        if(a[stx] < b[sty])
            v[++poz] = a[stx++];
        else
            v[++poz] = b[sty++];
    }
    while(stx <= mij)
        v[++poz] = a[stx++];
    while(sty <= mij)
        v[++poz] = b[sty++];
}

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

int main()
{
    in >> n;
    for(int i = 1; i <= n; i++)
        in >> v[i];
    mergesort(1, n);
    for(int i = 1; i <= n; i++)
        out << v[i] << " ";
    return 0;
}