Artifact 22cbd7d786057de9f7264891c6e4f11de266d072
#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;
class ColorfulStrings { public:
string getKth(int n, int k)
{
// cannot have 11 distinct digits
// if we have 0, then ...
// if we have 1, then ...
if(n>8)
return "";
string s = (n>=2 ? "23456789" : "0123456789");
do {
if( is_colorful(s,n) )
if( --k == 0 )
return s.substr(0,n);
} while( next_perm(s, n>=2 ? 8-n : 10-n) );
return "";
}
bool is_colorful(string& s, int n) {
set<int> ps;
for(int i=0; i<n; ++i) {
int p = s[i]-'0';
if( !ps.insert(p).second )
return false;
for(int j=i+1; j<n; ++j) {
p *= s[j]-'0';
if( !ps.insert(p).second )
return false;
}
}
return true;
}
int fact(int n) {
return n ? n*fact(n-1) : 1;
}
bool next_perm(string& s, int nn) {
int f = fact(nn);
while(f--)
if( !next_permutation(s.begin(), s.end()) )
return false;
return true;
}
};
// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
{ ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
{ os << "{ ";
for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const string& Expected, const string& Received) {
bool ok = (Expected == Received);
if(ok) cerr << "PASSED" << timer() << endl; else { cerr << "FAILED" << timer() << endl;
cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END verify_case(_, ColorfulStrings().getKth(n, k));}
int main(){
CASE(0)
int n = 3;
int k = 4;
string _ = "238";
END
CASE(1)
int n = 4;
int k = 2000;
string _ = "";
END
CASE(2)
int n = 5;
int k = 1;
string _ = "23457";
END
CASE(3)
int n = 2;
int k = 22;
string _ = "52";
END
CASE(4)
int n = 6;
int k = 464;
string _ = "257936";
END
CASE(5)
int n = 1;
int k = 1;
string _ = "0";
END
CASE(6)
int n = 50;
int k = 1000000000;
string _ = "???";
END
CASE(7)
int n = 2;
int k = 57;
string _ = "???";
END
}
// END CUT HERE