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Cod sursa(job #485321)
#include<fstream>
#include<iostream>
using namespace std;
void radix_sort(int byte, int n ,unsigned long *src, unsigned long *dest)
{
unsigned long count[256]={0};
unsigned long index[256]={0};
for(int i=0; i<n; ++i)
count[(src[i]>>(byte<<3))&0xff]++;
for(int i=1; i<256; ++i)
index[i]=index[i-1]+count[i-1];
for(int i=0; i<n; ++i)
dest[index[(src[i]>>(byte<<3))&0xff]++]=src[i];
}
int main()
{
int n;
unsigned long *a;
unsigned long *b;
fstream fin("algsort.in", fstream::in);
fstream fout("algsort.out", fstream::out);
fin>>n;
a=new unsigned long[n];
b=new unsigned long[n];
for(int i=0; i<n; ++i)
{
fin>>a[i];
//cout<<a[i]<<" ";
}
//cout<<endl;
radix_sort(0,n,a,b);
radix_sort(1,n,b,a);
radix_sort(2,n,a,b);
radix_sort(3,n,a,b);
for(int i=0; i<n; ++i)
fout<<a[i]<<" ";
fout<<endl;
delete a;
delete b;
fin.close();
fout.close();
return 0;
}