b9612fa18c 2014-04-19 kinaba: #include <iostream> b9612fa18c 2014-04-19 kinaba: #include <sstream> b9612fa18c 2014-04-19 kinaba: #include <iomanip> b9612fa18c 2014-04-19 kinaba: #include <vector> b9612fa18c 2014-04-19 kinaba: #include <string> b9612fa18c 2014-04-19 kinaba: #include <map> b9612fa18c 2014-04-19 kinaba: #include <set> b9612fa18c 2014-04-19 kinaba: #include <algorithm> b9612fa18c 2014-04-19 kinaba: #include <numeric> b9612fa18c 2014-04-19 kinaba: #include <iterator> b9612fa18c 2014-04-19 kinaba: #include <functional> b9612fa18c 2014-04-19 kinaba: #include <complex> b9612fa18c 2014-04-19 kinaba: #include <queue> b9612fa18c 2014-04-19 kinaba: #include <stack> b9612fa18c 2014-04-19 kinaba: #include <cmath> b9612fa18c 2014-04-19 kinaba: #include <cassert> b9612fa18c 2014-04-19 kinaba: #include <tuple> b9612fa18c 2014-04-19 kinaba: using namespace std; b9612fa18c 2014-04-19 kinaba: typedef long long LL; b9612fa18c 2014-04-19 kinaba: typedef complex<double> CMP; b9612fa18c 2014-04-19 kinaba: b9612fa18c 2014-04-19 kinaba: static const unsigned MODVAL = 1000000007; b9612fa18c 2014-04-19 kinaba: struct mint b9612fa18c 2014-04-19 kinaba: { b9612fa18c 2014-04-19 kinaba: unsigned val; b9612fa18c 2014-04-19 kinaba: mint():val(0){} b9612fa18c 2014-04-19 kinaba: mint(int x):val(x%MODVAL) {} b9612fa18c 2014-04-19 kinaba: mint(unsigned x):val(x%MODVAL) {} b9612fa18c 2014-04-19 kinaba: mint(LL x):val(x%MODVAL) {} b9612fa18c 2014-04-19 kinaba: }; b9612fa18c 2014-04-19 kinaba: mint& operator+=(mint& x, mint y) { return x = x.val+y.val; } b9612fa18c 2014-04-19 kinaba: mint operator+(mint x, mint y) { return x+=y; } b9612fa18c 2014-04-19 kinaba: b9612fa18c 2014-04-19 kinaba: class AlternativePiles { public: b9612fa18c 2014-04-19 kinaba: int count(string C, int M) b9612fa18c 2014-04-19 kinaba: { b9612fa18c 2014-04-19 kinaba: vector<mint> dp((M+1)*M); b9612fa18c 2014-04-19 kinaba: dp[0] = 1; b9612fa18c 2014-04-19 kinaba: b9612fa18c 2014-04-19 kinaba: for(char c : C) b9612fa18c 2014-04-19 kinaba: { b9612fa18c 2014-04-19 kinaba: vector<mint> dp2((M+1)*M); b9612fa18c 2014-04-19 kinaba: for(int m=0; m<=M; ++m) b9612fa18c 2014-04-19 kinaba: for(int r=0; r<M; ++r) { b9612fa18c 2014-04-19 kinaba: int mr = m*M+r; b9612fa18c 2014-04-19 kinaba: if((c=='R' || c=='W') && m+1<=M) b9612fa18c 2014-04-19 kinaba: dp2[(m+1)*M+(r+1)%M] += dp[mr]; b9612fa18c 2014-04-19 kinaba: if((c=='G' || c=='W') && m-1>=0) b9612fa18c 2014-04-19 kinaba: dp2[(m-1)*M+r] += dp[mr]; b9612fa18c 2014-04-19 kinaba: if(c=='B' || c=='W') b9612fa18c 2014-04-19 kinaba: dp2[m*M+r] += dp[mr]; b9612fa18c 2014-04-19 kinaba: } b9612fa18c 2014-04-19 kinaba: dp.swap(dp2); b9612fa18c 2014-04-19 kinaba: } b9612fa18c 2014-04-19 kinaba: return dp[0].val; b9612fa18c 2014-04-19 kinaba: } b9612fa18c 2014-04-19 kinaba: }; b9612fa18c 2014-04-19 kinaba: b9612fa18c 2014-04-19 kinaba: // BEGIN CUT HERE b9612fa18c 2014-04-19 kinaba: #include <ctime> b9612fa18c 2014-04-19 kinaba: double start_time; string timer() b9612fa18c 2014-04-19 kinaba: { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); } b9612fa18c 2014-04-19 kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v) b9612fa18c 2014-04-19 kinaba: { os << "{ "; b9612fa18c 2014-04-19 kinaba: for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it) b9612fa18c 2014-04-19 kinaba: os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; } b9612fa18c 2014-04-19 kinaba: void verify_case(const int& Expected, const int& Received) { b9612fa18c 2014-04-19 kinaba: bool ok = (Expected == Received); b9612fa18c 2014-04-19 kinaba: if(ok) cerr << "PASSED" << timer() << endl; else { cerr << "FAILED" << timer() << endl; b9612fa18c 2014-04-19 kinaba: cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } } b9612fa18c 2014-04-19 kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock(); b9612fa18c 2014-04-19 kinaba: #define END verify_case(_, AlternativePiles().count(C, M));} b9612fa18c 2014-04-19 kinaba: int main(){ b9612fa18c 2014-04-19 kinaba: b9612fa18c 2014-04-19 kinaba: CASE(0) b9612fa18c 2014-04-19 kinaba: string C = "WRGWWRGW"; b9612fa18c 2014-04-19 kinaba: int M = 2; b9612fa18c 2014-04-19 kinaba: int _ = 3; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: CASE(1) b9612fa18c 2014-04-19 kinaba: string C = "RRGG"; b9612fa18c 2014-04-19 kinaba: int M = 1; b9612fa18c 2014-04-19 kinaba: int _ = 0; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: CASE(2) b9612fa18c 2014-04-19 kinaba: string C = "BBBB"; b9612fa18c 2014-04-19 kinaba: int M = 5; b9612fa18c 2014-04-19 kinaba: int _ = 1; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: CASE(3) b9612fa18c 2014-04-19 kinaba: string C = "WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW"; b9612fa18c 2014-04-19 kinaba: int M = 50; b9612fa18c 2014-04-19 kinaba: int _ = 265470435; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: CASE(4) b9612fa18c 2014-04-19 kinaba: string C = "WRWRGWWGWWWRWBWRWGWWRWBWWRGWBWGRGWWGWGRWGRWBRWBW"; b9612fa18c 2014-04-19 kinaba: int M = 7; b9612fa18c 2014-04-19 kinaba: int _ = 7400348; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: /* b9612fa18c 2014-04-19 kinaba: CASE(6) b9612fa18c 2014-04-19 kinaba: string C = ; b9612fa18c 2014-04-19 kinaba: int M = ; b9612fa18c 2014-04-19 kinaba: int _ = ; b9612fa18c 2014-04-19 kinaba: END b9612fa18c 2014-04-19 kinaba: */ b9612fa18c 2014-04-19 kinaba: } b9612fa18c 2014-04-19 kinaba: // END CUT HERE