Vectori de frecventa

#include <iostream>
using namespace std;
int main()
{
 int i,v[10],c;
 long long x;
 for(i=0;i<=9;++i) v[i]=0;
 cin>>x;
 while(x){c=x%10;x=x/10;v[c]=1;}
 for(i=9;i>=0;--i) if(v[i]!=0) cout<<i;
 return 0;
}
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