Artifact 2dc990563f003d056269eaf3f69bce652e119874
#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 <tuple>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;
static const unsigned MODVAL = 1000000007;
struct mint
{
unsigned val;
mint():val(0){}
mint(int x):val(x%MODVAL) {}
mint(unsigned x):val(x%MODVAL) {}
mint(LL x):val(x%MODVAL) {}
};
mint& operator+=(mint& x, mint y) { return x = x.val+y.val; }
mint operator+(mint x, mint y) { return x+=y; }
class AlternativePiles { public:
int count(string C, int M)
{
vector<mint> dp((M+1)*M);
dp[0] = 1;
for(char c : C)
{
vector<mint> dp2((M+1)*M);
for(int m=0; m<=M; ++m)
for(int r=0; r<M; ++r) {
int mr = m*M+r;
if((c=='R' || c=='W') && m+1<=M)
dp2[(m+1)*M+(r+1)%M] += dp[mr];
if((c=='G' || c=='W') && m-1>=0)
dp2[(m-1)*M+r] += dp[mr];
if(c=='B' || c=='W')
dp2[m*M+r] += dp[mr];
}
dp.swap(dp2);
}
return dp[0].val;
}
};
// 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(_, AlternativePiles().count(C, M));}
int main(){
CASE(0)
string C = "WRGWWRGW";
int M = 2;
int _ = 3;
END
CASE(1)
string C = "RRGG";
int M = 1;
int _ = 0;
END
CASE(2)
string C = "BBBB";
int M = 5;
int _ = 1;
END
CASE(3)
string C = "WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW";
int M = 50;
int _ = 265470435;
END
CASE(4)
string C = "WRWRGWWGWWWRWBWRWGWWRWBWWRGWBWGRGWWGWGRWGRWBRWBW";
int M = 7;
int _ = 7400348;
END
/*
CASE(6)
string C = ;
int M = ;
int _ = ;
END
*/
}
// END CUT HERE