結果

問題 No.1740 Alone 'a'
ユーザー LayCurseLayCurse
提出日時 2021-11-12 21:48:10
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 45 ms / 2,000 ms
コード長 7,505 bytes
コンパイル時間 2,365 ms
コンパイル使用メモリ 220,836 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-11-25 17:58:27
合計ジャッジ時間 4,004 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
このコードへのチャレンジ
（要ログイン）

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
5,248 KB
testcase_01 AC 2 ms
5,248 KB
testcase_02 AC 2 ms
5,248 KB
testcase_03 AC 45 ms
5,248 KB
testcase_04 AC 45 ms
5,248 KB
testcase_05 AC 3 ms
5,248 KB
testcase_06 AC 3 ms
5,248 KB
testcase_07 AC 2 ms
5,248 KB
testcase_08 AC 2 ms
5,248 KB
testcase_09 AC 2 ms
5,248 KB
testcase_10 AC 2 ms
5,248 KB
testcase_11 AC 9 ms
5,248 KB
testcase_12 AC 30 ms
5,248 KB
testcase_13 AC 28 ms
5,248 KB
testcase_14 AC 35 ms
5,248 KB
testcase_15 AC 2 ms
5,248 KB
testcase_16 AC 28 ms
5,248 KB
testcase_17 AC 3 ms
5,248 KB
testcase_18 AC 7 ms
5,248 KB
testcase_19 AC 31 ms
5,248 KB
testcase_20 AC 16 ms
5,248 KB
testcase_21 AC 23 ms
5,248 KB
testcase_22 AC 26 ms
5,248 KB
testcase_23 AC 27 ms
5,248 KB
testcase_24 AC 18 ms
5,248 KB
testcase_25 AC 17 ms
5,248 KB
testcase_26 AC 22 ms
5,248 KB
testcase_27 AC 23 ms
5,248 KB
testcase_28 AC 20 ms
5,248 KB
testcase_29 AC 37 ms
5,248 KB
testcase_30 AC 23 ms
5,248 KB
testcase_31 AC 27 ms
5,248 KB
testcase_32 AC 20 ms
5,248 KB
testcase_33 AC 27 ms
5,248 KB
testcase_34 AC 7 ms
5,248 KB
testcase_35 AC 19 ms
5,248 KB
testcase_36 AC 16 ms
5,248 KB
testcase_37 AC 8 ms
5,248 KB
testcase_38 AC 15 ms
5,248 KB
testcase_39 AC 3 ms
5,248 KB
testcase_40 AC 10 ms
5,248 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 # 

#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]);
0