Cod sursa(job #1973738)

Utilizator TincaMateiTinca Matei TincaMatei Data 25 aprilie 2017 20:07:14
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.71 kb
#include <cstdio>

const int MAX_N = 500000;
int v[ MAX_N ];

void qsort(int begin, int end) {
  int b, e, pivot, aux;
  b = begin;
  e = end;
  pivot = v[(b + e) / 2];
  while(b <= e) {
    while(v[b] < pivot) b++;
    while(v[e] > pivot) e--;
    if(b<=e) {
      aux = v[b];
      v[b] = v[e];
      v[e] = aux;
      b++;
      e--;
    }
  }
  if(begin < e)
    qsort(begin, e);
  if(b < end)
    qsort(b, end);
}

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

  qsort(0, n - 1);

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