結果

問題 No.1646 Avoid Palindrome
ユーザー tanimani364tanimani364
提出日時 2021-08-13 22:23:29
言語 C++17
(gcc 13.2.0 + boost 1.83.0)
結果
AC  
実行時間 2,390 ms / 3,000 ms
コード長 4,402 bytes
コンパイル時間 2,014 ms
コンパイル使用メモリ 201,444 KB
実行使用メモリ 4,380 KB
最終ジャッジ日時 2023-08-08 09:55:36
合計ジャッジ時間 76,285 ms
ジャッジサーバーID
（参考情報） 		judge13 / judge15
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
4,376 KB
testcase_01 AC 2 ms
4,376 KB
testcase_02 AC 2 ms
4,376 KB
testcase_03 AC 3 ms
4,376 KB
testcase_04 AC 2,208 ms
4,376 KB
testcase_05 AC 2,210 ms
4,376 KB
testcase_06 AC 2,131 ms
4,380 KB
testcase_07 AC 2,210 ms
4,376 KB
testcase_08 AC 2,231 ms
4,376 KB
testcase_09 AC 2,119 ms
4,376 KB
testcase_10 AC 2,174 ms
4,380 KB
testcase_11 AC 2,111 ms
4,380 KB
testcase_12 AC 2,205 ms
4,380 KB
testcase_13 AC 2,227 ms
4,376 KB
testcase_14 AC 2,207 ms
4,380 KB
testcase_15 AC 2,250 ms
4,376 KB
testcase_16 AC 2,195 ms
4,376 KB
testcase_17 AC 2,290 ms
4,376 KB
testcase_18 AC 2,232 ms
4,380 KB
testcase_19 AC 2,215 ms
4,376 KB
testcase_20 AC 2,234 ms
4,380 KB
testcase_21 AC 2,281 ms
4,376 KB
testcase_22 AC 2,204 ms
4,380 KB
testcase_23 AC 2,300 ms
4,376 KB
testcase_24 AC 2,390 ms
4,376 KB
testcase_25 AC 2,385 ms
4,380 KB
testcase_26 AC 2,386 ms
4,380 KB
testcase_27 AC 2,386 ms
4,380 KB
testcase_28 AC 2,388 ms
4,380 KB
testcase_29 AC 2,309 ms
4,376 KB
testcase_30 AC 2,309 ms
4,380 KB
testcase_31 AC 2,310 ms
4,380 KB
testcase_32 AC 2,308 ms
4,380 KB
testcase_33 AC 2,308 ms
4,380 KB
testcase_34 AC 2,387 ms
4,380 KB
testcase_35 AC 2 ms
4,380 KB
testcase_36 AC 1 ms
4,376 KB
testcase_37 AC 1 ms
4,376 KB
testcase_38 AC 1 ms
4,380 KB
testcase_39 AC 2 ms
4,380 KB
testcase_40 AC 1 ms
4,376 KB
testcase_41 AC 1 ms
4,376 KB
testcase_42 AC 2 ms
4,380 KB
testcase_43 AC 2,308 ms
4,376 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>
//#include<boost/multiprecision/cpp_int.hpp>
//#include<boost/multiprecision/cpp_dec_float.hpp>
//#include <atcoder/all>
using namespace std;
#define rep(i, a) for (int i = (int)0; i < (int)a; ++i)
#define rrep(i, a) for (int i = (int)a; i > -1; --i)
#define REP(i, a, b) for (int i = (int)a; i < (int)b; ++i)
#define RREP(i, a, b) for (int i = (int)a; i > b; --i)
#define repl(i, a) for (ll i = (ll)0; i < (ll)a; ++i)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll
#define fi first
#define se second
using ll = long long;
constexpr ll mod = 1e9 + 7;
constexpr ll mod_998244353 = 998244353;
constexpr ll INF = 1LL << 60;

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

//using lll=boost::multiprecision::cpp_int;
// using Double=boost::multiprecision::number<boost::multiprecision::cpp_dec_float<128>>;//仮数部が1024桁
template <class T>
inline bool chmin(T &a, T b)
{
  if (a > b)
  {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T &a, T b)
{
  if (a < b)
  {
    a = b;
    return true;
  }
  return false;
}

ll mypow(ll x, ll n, const ll &p = -1)
{ // x^nをmodで割った余り

  if (p != -1)
  {
    x = (x % p + p) % p;
  }
  ll ret = 1;
  while (n > 0)
  {
    if (n & 1)
    {
      if (p != -1)
        ret = (ret * x) % p;
      else
        ret *= x;
    }
    if (p != -1)
      x = (x * x) % p;
    else
      x *= x;
    n >>= 1;
  }
  return ret;
}

struct myrand{
  random_device seed;
  mt19937 mt;
  myrand():mt(seed()){}
  int operator()(int a,int b){//[a,b)
    uniform_int_distribution<int>dist(a,b-1);
    return dist(mt);
  }
};

//using namespace atcoder;

//------------------------
//------------------------
//------------------------
//------------------------
//------------------------

template<int mod>
struct Modint{
    int x;
    Modint():x(0){}
    Modint(int64_t y):x((y%mod+mod)%mod){}

    Modint &operator+=(const Modint &p){
			if((x+=p.x)>=mod)
				x -= mod;
			return *this;
		}

		Modint &operator-=(const Modint &p){
			if((x+=mod-p.x)>=mod)
				x -= mod;
			return *this;
		}

		Modint &operator*=(const Modint &p){
			x = (1LL * x * p.x) % mod;
			return *this;
		}

		Modint &operator/=(const Modint &p){
			*this *= p.inverse();
			return *this;
		}

		Modint operator-() const { return Modint(-x); }
		Modint operator+(const Modint &p) const{
			return Modint(*this) += p;
		}
		Modint operator-(const Modint &p) const{
			return Modint(*this) -= p;
		}
		Modint operator*(const Modint &p) const{
			return Modint(*this) *= p;
		}
		Modint operator/(const Modint &p) const{
			return Modint(*this) /= p;
		}

		bool operator==(const Modint &p) const { return x == p.x; }
		bool operator!=(const Modint &p) const{return x != p.x;}

		Modint inverse() const{//非再帰拡張ユークリッド
			int a = x, b = mod, u = 1, v = 0;
			while(b>0){
				int t = a / b;
				swap(a -= t * b, b);
				swap(u -= t * v, v);
			}
			return Modint(u);
		}

		Modint pow(int64_t n) const{//繰り返し二乗法
			Modint ret(1), mul(x);
			while(n>0){
				if(n&1)
					ret *= mul;
				mul *= mul;
				n >>= 1;
			}
			return ret;
		}

		friend ostream &operator<<(ostream &os,const Modint &p){
			return os << p.x;
		}
};

using modint = Modint<mod>;
using modint2= Modint<mod_998244353>;

modint2 dp[26][26];
modint2 nx[26][26];
void solve()
{ 
  int n;
  cin>>n;
  string s;
  cin>>s;
  if(n==1){
    if(s!="?"){
      cout<<1<<"\n";
    }else{
      cout<<26<<"\n";
    }
    return;
  }
  memset(dp,0,sizeof(dp));
  memset(nx,0,sizeof(nx));
  rep(i,26){
    rep(j,26){
      if(i==j)continue;
      if(s[0]!='?'&&s[0]-'a'!=i)continue;
      if(s[1]!='?'&&s[1]-'a'!=j)continue;
      dp[i][j]=1;
    }
  }
  rep(i,n-2){
    rep(x,26){
      rep(y,26){
        rep(z,26){
          if(x==y||y==z||z==x)continue;
          if(s[i+2]!='?'&&s[i+2]-'a'!=z)continue;
          nx[y][z]+=dp[x][y];
        }
      }
    }
    {
      rep(x,26)rep(y,26)dp[x][y]=0;
    }
    swap(nx,dp);
    
  }
  modint2 ans=0;
  rep(i,26)rep(j,26)ans+=dp[i][j];
  cout<<ans<<"\n";
}

int main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout << fixed << setprecision(15);
  solve();
  return 0;
}
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