Cod sursa(job #2872471)

Utilizator matthriscuMatt . matthriscu Data 17 martie 2022 09:13:07
Problema Radix Sort Scor 30
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <fstream>
#include <vector>

#define BYTE_SIZE 8
#define NMAX 10000000

using namespace std;

unsigned char get_nth_byte(int x, unsigned int n)
{
	return (x & ((int)(unsigned char)-1 << (n * BYTE_SIZE))) >> (n * BYTE_SIZE);
}

int main(void)
{
	ifstream fin("radixsort.in");
	ofstream fout("radixsort.out");

	int N, A, B, C;
	fin >> N >> A >> B >> C;

	int *v = new int[N];
	v[0] = B;
	for (int i = 1; i < N; ++i)
		v[i] = (A * v[i - 1] + B) % C;
	
	for (int byte = 0; byte < sizeof(int); ++byte) {
		vector<int> buckets[1 << BYTE_SIZE];

		for (int i = 0; i < N; ++i)
			buckets[get_nth_byte(v[i], byte)].push_back(v[i]);

		int cnt = 0;
		for (int i = 0; i < (1 << BYTE_SIZE); ++i)
			for (const int &x : buckets[i])
				v[cnt++] = x;
	}

	for (int i = 0; i < N; i += 10)
		fout << v[i] << ' ';
	fout << '\n';

	delete[] v;
	fin.close();
	fout.close();
	return 0;
}