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Cod sursa(job #520730)
#include<fstream.h>
#include<algorithm>
#include<vector>
using namespace std;
vector<int> v[300];
vector <int> :: iterator it;
int a[500005];
int main()
{
int i,k,n,q,val,nr;
ifstream f("algsort.in");
f>>n;
for (i=1;i<=n;i++)
f>>a[i];
int p=4;
k=1<<p;
for (q=1;q<=31/p+1;++q)
{
for (i=1;i<=n;++i)
{
val=(a[i]>>(p*q-p));
val=val-((val>>p)<<p);
v[val].push_back(a[i]);
}
nr=0;
for (i=0;i<k;++i)
{
for (it=v[i].begin();it<v[i].end();++it)
a[++nr]=*it;
v[i].clear();
v[i].resize(4);
}
}
ofstream g("algsort.out");
for (i=1;i<=n;i++)
g<<a[i]<<' ';
f.close();
g.close();
return 0;
}