Cod sursa(job #1144356)

Utilizator manciu_ionIon Manciu manciu_ion Data 16 martie 2014 23:33:11
Problema Radix Sort Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 2.8 kb
#include <algorithm>
#include <cassert>
#include <cstring>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <cstdio>
#include <map>
#include <set>
#include <sstream>
#include <vector>

using namespace std;

#define MAX_N 10000000 + 1
#define RADIX 0xFF
#define RADIX_SIZE 8
#define TOTAL_BYTES sizeof(numbers[0])

int n;
int numbers[MAX_N];

#define get_byte(x) ((x>>(byte * 8))&RADIX)

void countsort(int A[], int B[], int byte) {
    int counter[1<<RADIX_SIZE];
    int index[1<<RADIX_SIZE];

    memset(counter, 0, sizeof(counter));

    for(int i = 0; i < n; i ++)
        ++counter[get_byte(A[i])];

    index[0] = 0;

    for(int i = 1; i < 1<<RADIX_SIZE; i ++)
        index[i] = index[i-1] + counter[i-1];

    for(int i = 0; i < n; i ++)
        B[index[get_byte(A[i])]++] = A[i];
}
void radixsort() {
    int *temp = new int[n]; // avem nevoie de un array ca spatiu temporar
    for (int i = 0; i < TOTAL_BYTES; i ++) {
        if(i % 2 == 0)
            countsort(numbers, temp, i);// sortez dupa byte-ul i
        else
            countsort(temp, numbers, i);
    }
}
void read()
{
    int a,b,c;
    scanf("%d%d%d%d", &n, &a, &b, &c);

    numbers[0] = b % c;
    for(int i = 1; i < n; i ++)
        numbers[i] = (1LL * a * numbers[i-1] % c + b) % c;
}
void write()
{
    for(int i = 0; i < n; i +=10)
        printf("%d ", numbers[i]);
    printf("\n");
}

int main()
{
    freopen("radixsort.in", "rt", stdin);
    freopen("radixsort.out", "wt", stdout);

    read();

    radixsort();
//    sort(numbers, numbers + n);

    write();

    fclose(stdin);
    fclose(stdout);
    return 0;
}

/*
#include<stdio.h>
#define MAX 20
#define SHOWPASS
#define BASE 10
void print(int *a, int n)
{
  int i;
  for (i = 0; i < n; i++)
    printf("%d\t", a[i]);
}

void radixsort(int *a, int n)
{
  int i, b[MAX], m = a[0], exp = 1;
  for (i = 1; i < n; i++)
  {
    if (a[i] > m)
      m = a[i];
  }

  while (m / exp > 0)
  {
    int bucket[BASE] ={  0 };
    for (i = 0; i < n; i++)
      bucket[(a[i] / exp) % BASE]++;
    for (i = 1; i < BASE; i++)
      bucket[i] += bucket[i - 1];
    for (i = n - 1; i >= 0; i--)
      b[--bucket[(a[i] / exp) % BASE]] = a[i];
    for (i = 0; i < n; i++)
      a[i] = b[i];
    exp *= BASE;

    #ifdef SHOWPASS
      printf("\nPASS   : ");
      print(a, n);
    #endif
  }
}

int main()
{
  int arr[MAX];
  int i, n;
  printf("Enter total elements (n <= %d) : ", MAX);
  scanf("%d", &n);
  n = n < MAX ? n : MAX;

  printf("Enter %d Elements : ", n);
  for (i = 0; i < n; i++)
    scanf("%d", &arr[i]);

  printf("\nARRAY  : ");
  print(&arr[0], n);

  radixsort(&arr[0], n);

  printf("\nSORTED : ");
  print(&arr[0], n);
  printf("\n");

  return 0;
}
*/