Artifact 7c3fa8bfe90815c9dea09ee07ef9d513fb6040ec
#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;
int gcd(int x, int y)
{
while(x)
swap(x, y%=x);
return y;
}
int lcm(int x, int y)
{
return x/gcd(x,y)*y;
}
class ArtShift { public:
int maxShifts(string sequence)
{
int B=0, W=0;
for(int i=0; i<sequence.size(); ++i)
(sequence[i]=='B' ? B : W)++;
memo.assign(31*31, set<int>());
for(int b=0; b<=B; ++b) memo[b*31+0].insert(1);
for(int w=0; w<=W; ++w) memo[0*31+w].insert(1);
return *rec(B,W).rbegin();
}
vector< set<int> > memo;
const set<int>& rec(int B, int W)
{
set<int>& result = memo[B*31+W];
if( !result.empty() )
return result;
result.insert(B+W);
for(int b= 0; b<=B; ++b)
for(int w=!b; w<=W; ++w) {
const set<int>& x = rec(b,w);
const set<int>& y = rec(B-b,W-w);
for(set<int>::const_iterator it=x.begin(); it!=x.end(); ++it)
for(set<int>::const_iterator jt=y.begin(); jt!=y.end(); ++jt)
result.insert(lcm(*it,*jt));
}
return result;
}
};
// 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 int& Expected, const int& 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(_, ArtShift().maxShifts(sequence));}
int main(){
CASE(0)
string sequence = "BW";
int _ = 2;
END
CASE(1)
string sequence = "BBBWBBB";
int _ = 7;
END
CASE(2)
string sequence = "BWBWB";
int _ = 6;
END
CASE(3)
string sequence = "WWWWWWWWW";
int _ = 1;
END
CASE(4)
string sequence = "WWWWWWWWWBBWB";
int _ = 60;
END
CASE(5)
string sequence = "W";
int _ = 1;
END
CASE(6)
string sequence = "B";
int _ = 1;
END
CASE(7)
string sequence = "BB";
int _ = 1;
END
CASE(8)
string sequence = "BWBWBWBWBWBWBWBWBWBWBWBWBWBWBW";
int _ = -1;
END
}
// END CUT HERE