結果
問題 | No.1646 Avoid Palindrome |
ユーザー | riano |
提出日時 | 2021-08-13 21:56:14 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 1,732 ms / 3,000 ms |
コード長 | 3,960 bytes |
コンパイル時間 | 1,508 ms |
コンパイル使用メモリ | 168,312 KB |
実行使用メモリ | 267,812 KB |
最終ジャッジ日時 | 2023-08-08 09:39:06 |
合計ジャッジ時間 | 35,764 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge11 |
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 | 2 ms
4,376 KB |
testcase_01 | AC | 2 ms
4,376 KB |
testcase_02 | AC | 2 ms
4,380 KB |
testcase_03 | AC | 2 ms
4,380 KB |
testcase_04 | AC | 413 ms
252,292 KB |
testcase_05 | AC | 406 ms
252,356 KB |
testcase_06 | AC | 385 ms
243,828 KB |
testcase_07 | AC | 395 ms
252,388 KB |
testcase_08 | AC | 399 ms
254,696 KB |
testcase_09 | AC | 380 ms
242,212 KB |
testcase_10 | AC | 391 ms
248,256 KB |
testcase_11 | AC | 377 ms
241,448 KB |
testcase_12 | AC | 400 ms
251,796 KB |
testcase_13 | AC | 398 ms
254,884 KB |
testcase_14 | AC | 1,596 ms
247,404 KB |
testcase_15 | AC | 1,630 ms
252,600 KB |
testcase_16 | AC | 1,588 ms
245,940 KB |
testcase_17 | AC | 1,658 ms
256,636 KB |
testcase_18 | AC | 1,609 ms
249,780 KB |
testcase_19 | AC | 1,603 ms
248,684 KB |
testcase_20 | AC | 1,614 ms
250,568 KB |
testcase_21 | AC | 1,657 ms
256,448 KB |
testcase_22 | AC | 1,597 ms
247,672 KB |
testcase_23 | AC | 1,660 ms
257,824 KB |
testcase_24 | AC | 1,732 ms
267,812 KB |
testcase_25 | AC | 1,728 ms
267,484 KB |
testcase_26 | AC | 1,730 ms
267,488 KB |
testcase_27 | AC | 1,729 ms
267,688 KB |
testcase_28 | AC | 1,730 ms
267,636 KB |
testcase_29 | AC | 250 ms
267,708 KB |
testcase_30 | AC | 250 ms
267,468 KB |
testcase_31 | AC | 251 ms
267,476 KB |
testcase_32 | AC | 253 ms
267,484 KB |
testcase_33 | AC | 252 ms
267,700 KB |
testcase_34 | AC | 1,729 ms
267,544 KB |
testcase_35 | AC | 2 ms
4,376 KB |
testcase_36 | AC | 2 ms
4,380 KB |
testcase_37 | AC | 1 ms
4,376 KB |
testcase_38 | AC | 1 ms
4,376 KB |
testcase_39 | AC | 1 ms
4,376 KB |
testcase_40 | AC | 1 ms
4,380 KB |
testcase_41 | AC | 2 ms
4,380 KB |
testcase_42 | AC | 1 ms
4,384 KB |
testcase_43 | AC | 251 ms
267,544 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; #define ll long long #define rep(i,n) for(int (i)=0;(i)<(n);(i)++) #define Pr pair<ll,ll> #define Tp tuple<int,int,int> #define riano_ std::ios::sync_with_stdio(false);std::cin.tie(nullptr);typedef modint<mod> mint using Graph = vector<vector<int>>; const ll mod = 998244353; template<uint64_t mod> struct modint{ uint64_t val; constexpr modint(const int64_t val_=0) noexcept:val((val_%int64_t(mod)+int64_t(mod))%int64_t(mod)){} constexpr modint operator-() const noexcept{ return modint(*this)=mod-val; } constexpr modint operator+(const modint rhs) const noexcept{ return modint(*this)+=rhs; } constexpr modint operator-(const modint rhs) const noexcept{ return modint(*this)-=rhs; } constexpr modint operator*(const modint rhs) const noexcept{ return modint(*this)*=rhs; } constexpr modint operator/(const modint rhs) const noexcept{ return modint(*this)/=rhs; } constexpr modint &operator+=(const modint rhs) noexcept{ val+=rhs.val; val-=((val>=mod)?mod:0); return (*this); } constexpr modint &operator-=(const modint rhs) noexcept{ val+=((val<rhs.val)?mod:0); val-=rhs.val; return (*this); } constexpr modint &operator*=(const modint rhs) noexcept{ val=val*rhs.val%mod; return (*this); } constexpr modint &operator/=(modint rhs) noexcept{ uint64_t ex=mod-2; modint now=1; while(ex){ now*=((ex&1)?rhs:1); rhs*=rhs,ex>>=1; } return (*this)*=now; } constexpr bool operator==(const modint rhs) noexcept{ return val==rhs.val; } constexpr bool operator!=(const modint rhs) noexcept{ return val!=rhs.val; } friend constexpr ostream &operator<<(ostream& os,const modint x) noexcept{ return os<<(x.val); } friend constexpr istream &operator>>(istream& is,modint& x) noexcept{ uint64_t t; is>>t,x=t; return is; } }; int main() { riano_; //ll N; cin >> N; ll ans = 0; ll N; cin >> N; string S; cin >> S; bool ok = true; rep(i,N-1){ if(S[i]==S[i+1]&&S[i]!='?') ok = false; if(i+2<N&&S[i]==S[i+2]&&S[i]!='?') ok = false; } if(!ok){ cout << 0 << endl; return 0; } mint dp[N+1][26*26]; rep(i,N+1){ rep(j,26*26) dp[i][j] = 0; } rep(i,N){ if(i==0){ if(S[i]!='?'){ dp[1][S[i]-'a'] = 1; } else{ rep(j,26){ dp[1][j] = 1; } } } if(i==1){ if(S[i]=='?'){ rep(j,26){ if(dp[1][j]==0) continue; rep(k,26){ if(j==k) continue; dp[2][26*j+k] += dp[1][j]; } } } else{ rep(j,26){ if(j==S[i]-'a') continue; dp[2][S[i]-'a'+26*j] += dp[1][j]; } } } else{ if(S[i]=='?'){ rep(j,26*26){ if(dp[i][j]==0) continue; ll k1 = j%26; ll k2 = j/26; rep(k,26){ if(k1==k||k2==k) continue; dp[i+1][k1*26+k] += dp[i][j]; } } } else{ rep(j,26*26){ if(dp[i][j]==0) continue; ll k1 = j%26; ll k2 = j/26; ll k = S[i]-'a'; if(k1==k||k2==k) continue; dp[i+1][k1*26+k] += dp[i][j]; } } } } mint ans = 0; rep(i,26*26){ ans += dp[N][i]; } cout << ans << endl; }