結果
問題 | No.2131 Concon Substrings (COuNt Version) |
ユーザー |
👑 ![]() |
提出日時 | 2022-12-02 22:44:38 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 47 ms / 2,000 ms |
コード長 | 2,939 bytes |
コンパイル時間 | 1,985 ms |
コンパイル使用メモリ | 197,756 KB |
最終ジャッジ日時 | 2025-02-09 04:07:05 |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 16 |
ソースコード
#include <bits/stdc++.h>#pragma GCC optimize("Ofast")using namespace std;using std::cout;using std::cin;using std::endl;using ll=long long;using ld=long double;ll ILL=2167167167167167167;const int INF=2100000000;const ll mod=998244353;#define rep(i,a,b) for (ll i=a;i<b;i++)#define all(p) p.begin(),p.end()template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;template<class T> ll LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}template<class T> ll UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}template<class T> bool chmin(T &a,const T &b){if(a>b){a=b;return 1;}else return 0;}template<class T> bool chmax(T &a,const T &b){if(a<b){a=b;return 1;}else return 0;}template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}void yneos(bool a){if(a) cout<<"Yes\n"; else cout<<"No\n";}template<class T> void vec_out(vector<T> &p){for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}template<class T> T min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}template<class T> T max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}template<class T> T sum(vector<T> &a){assert(!a.empty());T ans=a[0]-a[0];for(auto &x:a) ans+=x;return ans;}ll jyo(ll x,ll y,ll z){ll H=y; //ここからll a=1,b=(x%z+z)%z,c=1;while(H>0){a*=2;if(H%a!=0){H-=a/2;c*=b;c%=z;}b*=b;b%=z;} //ここまでreturn c;}namespace po167{struct combination{int upper;long long MOD;std::vector<long long> fact;std::vector<long long> rev;std::vector<long long> fact_rev;combination(int max,long long mod):upper(max),MOD(mod),fact(max+1),rev(max+1),fact_rev(max+1){for(long long i=0;i<=max;i++){if(i<2){fact[i]=1;fact_rev[i]=1;rev[i]=1;continue;}fact[i]=(fact[i-1]*i)%mod;rev[i]=mod-((mod/i)*rev[mod%i])%mod;fact_rev[i]=(fact_rev[i-1]*rev[i])%mod;}}long long Comb(int x,int y){assert(upper>=x);if (x<y||y<0||x<0) return 0;return (((fact_rev[y]*fact_rev[x-y])%MOD)*fact[x])%MOD;}long long P(int x,int y){assert(upper>=x);if (x<y||y<0||x<0) return 0;return (fact_rev[x-y]*fact[x])%MOD;}};}using po167::combination;void solve();// oddloopint main() {ios::sync_with_stdio(false);cin.tie(nullptr);int t=1;//cin>>t;rep(i,0,t) solve();}void solve(){combination table(1e6,mod);ll N;cin>>N;vector<ll> dp(3);dp[0]=1;ll ans=0;rep(i,0,N){vector<ll> n_dp(3);rep(j,0,3){dp[j]%=mod;n_dp[j]+=dp[j]*25;if(j!=2){n_dp[j+1]+=dp[j];}else{n_dp[0]+=dp[j];ans+=(dp[j]*jyo(26,N-i-1,mod))%mod;}}swap(dp,n_dp);}cout<<ans%mod<<"\n";}