Artifact e2ad405452c3a39a7601f13daacffe55dc169abf
#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>
using namespace std;
typedef long long LL;
typedef long double LD;
typedef complex<LD> CMP;
class FoxAndHandle { public:
string lexSmallestName(string S)
{
string cur = "";
int p = 0;
while(cur.size()*2<S.size()) {
string next_best;
int next_p = -1;
for(int x=p; x<S.size(); ++x)
if(possible(cur+S[x], x+1, S)) {
if(next_p==-1 || next_best>cur+S[x])
next_best=cur+S[x], next_p=x+1;
}
cur = next_best;
p = next_p;
}
return cur;
}
bool possible(const string& used, int x, const string& S)
{
int freq[26] = {0};
int pos[26] = {0};
int tot[26] = {0};
for(int i=0; i<used.size(); ++i)
freq[used[i]-'a']++;
for(int i=0; i<S.size(); ++i) {
if(x<=i)
pos[S[i]-'a']++;
tot[S[i]-'a']++;
}
for(int c=0; c<26; ++c)
if((freq[c]+pos[c])*2<tot[c] || freq[c]*2>tot[c])
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(_, FoxAndHandle().lexSmallestName(S));}
int main(){
CASE(0)
string S = "foxfox";
string _ = "fox";
END
CASE(1)
string S = "ccieliel";
string _ = "ceil";
END
CASE(2)
string S = "abaabbab";
string _ = "aabb";
END
CASE(3)
string S = "bbbbaaaa";
string _ = "bbaa";
END
CASE(4)
string S = "fedcbafedcba";
string _ = "afedcb";
END
CASE(5)
string S = "nodevillivedon";
string _ = "deilvon";
END
/*
CASE(6)
string S = ;
string _ = ;
END
CASE(7)
string S = ;
string _ = ;
END
*/
}
// END CUT HERE