結果
| 問題 | No.1740 Alone 'a' |
| ユーザー |
 LayCurse
|
| 提出日時 | 2021-11-12 21:48:10 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 56 ms / 2,000 ms |
| コード長 | 7,505 bytes |
| コンパイル時間 | 2,648 ms |
| コンパイル使用メモリ | 221,380 KB |
| 最終ジャッジ日時 | 2025-01-25 16:22:48 |
|
ジャッジサーバーID （参考情報） |
judge2 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 38 |
ソースコード
#pragma GCC optimize("Ofast")#pragma GCC optimize("unroll-loops")#pragma GCC optimize("inline")#include<bits/stdc++.h>using namespace std;#define MD (998244353U)struct Modint{unsigned val;Modint(){val=0;}Modint(int a){val = ord(a);}Modint(unsigned a){val = ord(a);}Modint(long long a){val = ord(a);}Modint(unsigned long long a){val = ord(a);}inline unsigned ord(unsigned a){return a%MD;}inline unsigned ord(int a){a %= (int)MD;if(a < 0){a += MD;}return a;}inline unsigned ord(unsigned long long a){return a%MD;}inline unsigned ord(long long a){a %= (int)MD;if(a < 0){a += MD;}return a;}inline unsigned get(){return val;}inline Modint &operator++(){val++;if(val >= MD){val -= MD;}return *this;}inline Modint &operator--(){if(val == 0){val = MD - 1;}else{--val;}return *this;}inline Modint operator++(int a){Modint res(*this);val++;if(val >= MD){val -= MD;}return res;}inline Modint operator--(int a){Modint res(*this);if(val == 0){val = MD - 1;}else{--val;}return res;}inline Modint &operator+=(Modint a){val += a.val;if(val >= MD){val -= MD;}return *this;}inline Modint &operator-=(Modint a){if(val < a.val){val = val + MD - a.val;}else{val -= a.val;}return *this;}inline Modint &operator*=(Modint a){val = ((unsigned long long)val*a.val)%MD;return *this;}inline Modint &operator/=(Modint a){return *this *= a.inverse();}inline Modint operator+(Modint a){return Modint(*this)+=a;}inline Modint operator-(Modint a){return Modint(*this)-=a;}inline Modint operator*(Modint a){return Modint(*this)*=a;}inline Modint operator/(Modint a){return Modint(*this)/=a;}inline Modint operator+(int a){return Modint(*this)+=Modint(a);}inline Modint operator-(int a){return Modint(*this)-=Modint(a);}inline Modint operator*(int a){return Modint(*this)*=Modint(a);}inline Modint operator/(int a){return Modint(*this)/=Modint(a);}inline Modint operator+(long long a){return Modint(*this)+=Modint(a);}inline Modint operator-(long long a){return Modint(*this)-=Modint(a);}inline Modint operator*(long long a){return Modint(*this)*=Modint(a);}inline Modint operator/(long long a){return Modint(*this)/=Modint(a);}inline Modint operator-(void){Modint res;if(val){res.val=MD-val;}else{res.val=0;}return res;}inline operator bool(void){return val!=0;}inline operator int(void){return get();}inline operator long long(void){return get();}inline Modint inverse(){int a = val;int b = MD;int u = 1;int v = 0;int t;Modint res;while(b){t = a / b;a -= t * b;swap(a, b);u -= t * v;swap(u, v);}if(u < 0){u += MD;}res.val = u;return res;}inline Modint pw(unsigned long long b){Modint a(*this);Modint res;res.val = 1;while(b){if(b&1){res *= a;}b >>= 1;a *= a;}return res;}inline bool operator==(int a){return ord(a)==val;}inline bool operator!=(int a){return ord(a)!=val;}};inline Modint operator+(int a, Modint b){return Modint(a)+=b;}inline Modint operator-(int a, Modint b){return Modint(a)-=b;}inline Modint operator*(int a, Modint b){return Modint(a)*=b;}inline Modint operator/(int a, Modint b){return Modint(a)/=b;}inline Modint operator+(long long a, Modint b){return Modint(a)+=b;}inline Modint operator-(long long a, Modint b){return Modint(a)-=b;}inline Modint operator*(long long a, Modint b){return Modint(a)*=b;}inline Modint operator/(long long a, Modint b){return Modint(a)/=b;}inline int my_getchar_unlocked(){static char buf[1048576];static int s = 1048576;static int e = 1048576;if(s == e && e == 1048576){e = fread_unlocked(buf, 1, 1048576, stdin);s = 0;}if(s == e){return EOF;}return buf[s++];}inline void rd(int &x){int k;int m=0;x=0;for(;;){k = my_getchar_unlocked();if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){x=k-'0';break;}}for(;;){k = my_getchar_unlocked();if(k<'0'||k>'9'){break;}x=x*10+k-'0';}if(m){x=-x;}}inline void rd(char &c){int i;for(;;){i = my_getchar_unlocked();if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF){break;}}c = i;}inline int rd(char c[]){int i;int sz = 0;for(;;){i = my_getchar_unlocked();if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF){break;}}c[sz++] = i;for(;;){i = my_getchar_unlocked();if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF){break;}c[sz++] = i;}c[sz]='\0';return sz;}struct MY_WRITER{char buf[1048576];int s;int e;MY_WRITER(){s = 0;e = 1048576;}~MY_WRITER(){if(s){fwrite_unlocked(buf, 1, s, stdout);}}};MY_WRITER MY_WRITER_VAR;void my_putchar_unlocked(int a){if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);MY_WRITER_VAR.s = 0;}MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;}inline void wt_L(char a){my_putchar_unlocked(a);}inline void wt_L(int x){int s=0;int m=0;char f[10];if(x<0){m=1;x=-x;}while(x){f[s++]=x%10;x/=10;}if(!s){f[s++]=0;}if(m){my_putchar_unlocked('-');}while(s--){my_putchar_unlocked(f[s]+'0');}}inline void wt_L(Modint x){int i;i = (int)x;wt_L(i);}int main(){int i;int N;rd(N);char S[N+2];int nx;int ny;Modint dp[2][2] = {};Modint nn[2][2];rd(S);dp[0][0] = 1;for(i=(0);i<(N);i++){int x;for(x=(0);x<(2);x++){int y;for(y=(0);y<(2);y++){nn[x][y] = 0;}}for(x=(0);x<(2);x++){int y;for(y=(0);y<(2);y++){int k;for(k=('a');k<('z'+1);k++){if(x == 0 && k > S[i]){continue;}if(k=='a'){ny = y +1;}else{ny = y +0;}if(ny >= 2){continue;}nx = x;if(k < S[i]){nx = 1;}nn[nx][ny] += dp[x][y];}}}for(x=(0);x<(2);x++){int y;for(y=(0);y<(2);y++){dp[x][y] = nn[x][y];}}}wt_L(dp[1][1]);wt_L('\n');return 0;}// cLay version 20211024-1// --- original code ---// #define MD 998244353// int @N; char S[N+2];// int nx, ny;// Modint dp[2][2] = {}, nn[2][2];// rd(S);// dp[0][0] = 1;// rep(i,N){// rep(x,2) rep(y,2) nn[x][y] = 0;// rep(x,2) rep(y,2) rep(k,'a','z'+1){// if(x == 0 && k > S[i]) continue;// ny = y + if[k=='a', 1, 0];// if(ny >= 2) continue;// nx = x;// if(k < S[i]) nx = 1;// nn[nx][ny] += dp[x][y];// }// rep(x,2) rep(y,2) dp[x][y] = nn[x][y];// }// wt(dp[1][1]);