Cod sursa(job #2675888)

Utilizator AlexNicuNicu Alexandru AlexNicu Data 22 noiembrie 2020 19:13:43
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;
#define MAX_N 500000
#define NO_VALUES (1 << 31)
#define NO_BUCKETS (1 << 16)
#define VALUES_PER_BUCKET (1 << 15)
#define VALUES_PER_BUCKET_BITS 15
int v1[MAX_N], v2[MAX_N];
int freq[NO_BUCKETS], ind[NO_BUCKETS];

inline int getBucketNumber(int value) {
  return value >> VALUES_PER_BUCKET_BITS;
}

int main() {
  FILE* fin = fopen("algsort.in", "r");
  int n, i;
  fscanf(fin, "%d", &n);
  for (i = 0; i < n; ++i)
    fscanf ( fin, "%d", &v1[i] );
  fclose(fin);

  for (i = 0; i < n; ++i)
    ++freq[getBucketNumber(v1[i])];

  for (i = 1; i < NO_BUCKETS; ++i)
    ind[i] = ind[i - 1] + freq[i - 1];

  for (i = 0; i < n; ++i)
    v2[ind[getBucketNumber(v1[i])]++] = v1[i];

  sort(v2 + 0, v2 + freq[0]);
  for (i = 1; i < NO_BUCKETS; ++i) {
    freq[i] += freq[i - 1];
    sort(v2 + freq[i - 1], v2 + freq[i]);
  }

  FILE* fout = fopen("algsort.out", "w");
  for (i = 0; i < n; ++i)
    fprintf(fout, "%d ", v2[i]);
  fclose(fout);
  return 0;
}