Cod sursa(job #1328924)

Utilizator tudorcomanTudor Coman tudorcoman Data 28 ianuarie 2015 21:25:19
Problema Radix Sort Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.5 kb
#include <fstream>
#include <vector>
#include <list>
#include <cstring>
#define get_byte(x) ((x>>(byte * 8))&RADIX)
using namespace std;

ifstream fin ("radixsort.in");
ofstream fout ("radixsort.out");

const int BASE = 10;
const int MAX_N = 10000000 + 1;
int numbers[MAX_N];
const int RADIX = 0xFF;
const int RADIX_SIZE = 8;
const int TOTAL_BYTES = sizeof(numbers[0]);
int n;


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);
    }
}
inline void read()
{
    int a,b,c;
    fin>>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;
    fin.close();
}
inline void write(ofstream& f)
{
    for(int i = 0; i < n; i +=10)
        f << numbers[i]<< ' ';
    f<<endl;
    f.close();
}
int main()
{
    read();
    radixsort();
    write(fout);
    return 0;
}