Cod sursa(job #797465)

Utilizator gallexdAlex Gabor gallexd Data 14 octombrie 2012 04:59:09
Problema Sortare prin comparare Scor 80
Compilator cpp Status done
Runda Arhiva educationala Marime 0.9 kb
#include <cstdio>

#define SWAP(a, b) aux=a, a=b, b=aux

int N;
int v[500010];

int part(int left, int right, int pivot) {
    int pvalue = v[pivot], final = left, aux;
    SWAP(v[pivot], v[right]);
    for (int i=left; i<right; ++i)
        if (v[i]<pvalue) {
            SWAP(v[i],v[final]);
            ++final;
        }
    SWAP(v[final], v[right]);
    return final;
}

void quicksort(int left, int right) {
    if(left<right) {
        int pivot;
        pivot = left + (right-left)/2;
        pivot = part(left, right, pivot);
        quicksort(left, pivot-1);
        quicksort(pivot+1, right);
    }
}

int main () {

    freopen("algsort.in","rt",stdin);
    freopen("algsort.out","wt",stdout);

    scanf("%d", &N);
    for (int i=0; i<N; ++i)
        scanf("%d", &v[i]);
    quicksort(0,N-1);
    for (int i=0; i<N; ++i)
        printf("%d ", v[i]);

    return 0;
}