Cod sursa(job #1823939)

Utilizator TincaMateiTinca Matei TincaMatei Data 6 decembrie 2016 23:46:15
Problema Radix Sort Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.01 kb
#include <cstdio>

const int MAX_N = 10000000;
unsigned int v[1+MAX_N], vc[1+MAX_N];
const int NR_BITS = 16;
const int BUCKET = 1 << NR_BITS;
int nr[BUCKET + 1];

inline void split(int n, int e) {
  int byte, mask, p;
  for(int i = 0; i < BUCKET; ++i)
    nr[i] = 0;
  mask = BUCKET - 1;
  p = e * NR_BITS;
  for(int i = 1; i <= n; ++i) {
    byte = (v[i] >> p) & mask;
    nr[byte + 1]++;
  }
  for(int i = 1; i < BUCKET; ++i)
    nr[i] += nr[i - 1];
  for(int i = 1; i <= n; ++i) {
    byte = (v[i] >> p) & mask;
    vc[nr[byte] + 1] = v[i];
    nr[byte]++;
  }
  for(int i = 1; i <= n; ++i)
    v[i] = vc[i];
}

int main() {
  int n, a, b, c;
  FILE *fin = fopen("radixsort.in", "r");
  fscanf(fin, "%d%d%d%d", &n, &a, &b, &c);
  fclose(fin);

  v[1] = b;
  for(int i = 2; i <= n; ++i)
    v[i] = (1LL * a * v[i - 1] + b) % c;

  for(int i = 0; i < 32 / NR_BITS; ++i)
    split(n, i);

  FILE *fout = fopen("radixsort.out", "w");
  for(int i = 1; i <= n; i = i + 10)
    fprintf(fout, "%u ", v[i]);
  fclose(fout);
  return 0;
}