Cod sursa(job #2215855)

Utilizator Horia14Horia Banciu Horia14 Data 23 iunie 2018 22:11:46
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.91 kb
#include<cstdio>
#include<cstdlib>
#include<ctime>
#define MAX_N 500000
using namespace std;

int v[MAX_N], n;

void read() {
    FILE* fin = fopen("algsort.in","r");
    fscanf(fin,"%d",&n);
    for(int i = 0; i < n; i++)
        fscanf(fin,"%d",&v[i]);
}

void quickSort(int Begin, int End) {
    int b = Begin, e = End, pivot = v[b+rand()%(e-b+1)];
    while(b <= e) {
        while(v[b] < pivot) b++;
        while(v[e] > pivot) e--;
        if(b <= e) {
            int tmp = v[b];
            v[b] = v[e];
            v[e] = tmp;
            b++;
            e--;
        }
    }
    if(Begin < e) quickSort(Begin,e);
    if(b < End) quickSort(b,End);
}

void write() {
    FILE* fout = fopen("algsort.out","w");
    for(int i = 0; i < n; i++)
        fprintf(fout,"%d ",v[i]);
    fprintf(fout,"\n");
    fclose(fout);
}

int main() {
    read();
    srand(time(NULL));
    quickSort(0,n-1);
    write();
    return 0;
}