Pagini recente » Cod sursa (job #3241806) | Cod sursa (job #3284958) | Cod sursa (job #571320) | Cod sursa (job #171301) | Cod sursa (job #2451388)
#include <fstream>
#include <vector>
#include <queue>
std::vector<unsigned int> read(std::istream &in);
void radix_sort(std::vector<unsigned int> &V);
int main()
{
std::ios_base::sync_with_stdio(false);
std::ifstream fin("algsort.in");
std::ofstream fout("algsort.out");
std::vector<unsigned int> V = read(fin);
radix_sort(V);
for (size_t i = 0; i < V.size(); i += 1)
fout << V[i] << ' ';
fout << std::endl;
return 0;
}
void radix_sort(std::vector<unsigned int> &V)
{
int d;
std::vector<unsigned int> temp_V(V.size());
std::vector<unsigned int> digit_counts(257);
for (unsigned int pos = 0; pos < 32; pos += 8)
{
temp_V.swap(V);
for (size_t i = 0; i < digit_counts.size(); ++i)
digit_counts[i] = 0;
for (auto v : temp_V)
{
d = (v >> pos) & 255;
digit_counts[d + 1] += 1;
}
for (size_t i = 1; i < digit_counts.size(); ++i)
digit_counts[i] += digit_counts[i - 1];
for (auto v : temp_V)
{
d = (v >> pos) & 255;
V[digit_counts[d]] = v;
digit_counts[d] += 1;
}
}
}
std::vector<unsigned int> read(std::istream &in)
{
int n;
in >> n;
std::vector<unsigned int> V(n);
for (size_t i = 0; i < V.size(); ++i)
{
in >> V[i];
}
return V;
}