Cod sursa(job #1338941)

Utilizator okros_alexandruOkros Alexandru okros_alexandru Data 10 februarie 2015 15:57:50
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.89 kb
#include <fstream>

#define Nmax 500100

using namespace std;

int N, V[Nmax];

void Quicksort(int left, int right) {

    int midL = left;
    int midR = right;
    int pivotValue = V[(left + right) >> 1];

    for(int i = left; i < midR; i++)
        if(V[i] < pivotValue)
            swap(V[midL++], V[i]);
        else
        if(V[i] > pivotValue)
            swap(V[i--], V[--midR]);

    if(midL - left > 1)
        Quicksort(left, midL);

    if(right - midR > 1)
        Quicksort(midR, right);

}
void Read() {

    ifstream in("algsort.in");
    in >> N;

    for(int i = 0; i < N; i++)
        in >> V[i];

    in.close();
}
void Write() {

    ofstream out("algsort.out");

    for(int i = 0; i < N; i++)
        out << V[i] << ' ';

    out << '\n';
    out.close();
}
int main() {

    Read();
    Quicksort(0, N);
    Write();

    return 0;
}