Submission #4712538


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#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
template<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u); }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
typedef ModInt<1000000007> mint;
/*---------------------------------------------------------------------------------------------------
            ∧_∧  
      ∧_∧  (´<_` )  Welcome to My Coding Space!
     ( ´_ゝ`) /  ⌒i     
    /   \     | |     
    /   / ̄ ̄ ̄ ̄/  |  
  __(__ニつ/     _/ .| .|____  
     \/____/ (u ⊃  
---------------------------------------------------------------------------------------------------*/







int N;
string S = "ACGT";
//---------------------------------------------------------------------------------------------------
bool contain(string s) {
	if (s.substr(0, 3) == "AGC") return true;
	if (s.substr(1, 3) == "AGC") return true;
	return false;
}
string add(string s, char c) {
	string res = s.substr(1) + c;

	if (contain(res)) return "";

	rep(i, 0, 3) {
		string tes = res;
		swap(tes[i], tes[i + 1]);
		if (contain(tes)) return "";
	}

	return res;
}
//---------------------------------------------------------------------------------------------------
void _main() {
	cin >> N;

	map<string, mint> dp;
	dp["####"] = 1;

	rep(i, 0, N) {
		map<string, mint> pd;
		fore(p, dp) {
			fore(c, S) {
				string nxt = add(p.first, c);
				if (nxt != "") pd[nxt] += p.second;
			}
		}
		swap(dp, pd);
	}

	mint ans = 0;
	fore(p, dp) ans += p.second;
	cout << ans << endl;
}

Submission Info

Submission Time
Task D - We Like AGC
User hamayanhamayan
Language C++14 (GCC 5.4.1)
Score 400
Code Size 3844 Byte
Status AC
Exec Time 123 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 3
AC × 13
Set Name Test Cases
Sample a01, a02, a03
All a01, a02, a03, b04, b05, b06, b07, b08, b09, b10, b11, b12, b13
Case Name Status Exec Time Memory
a01 AC 1 ms 256 KB
a02 AC 2 ms 256 KB
a03 AC 98 ms 256 KB
b04 AC 3 ms 256 KB
b05 AC 4 ms 256 KB
b06 AC 9 ms 256 KB
b07 AC 16 ms 256 KB
b08 AC 23 ms 256 KB
b09 AC 48 ms 256 KB
b10 AC 87 ms 256 KB
b11 AC 123 ms 256 KB
b12 AC 97 ms 256 KB
b13 AC 93 ms 256 KB