#506323 (C++17) No.1104 オンライン点呼

• 問題: No.1104 オンライン点呼
• ユーザー: LayCurse
• 提出日時: 2020-07-03 22:25:20
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 10 ms / 2,000 ms
• コード長: 2,513 bytes
• コンパイル時間: 6,288 ms
• コンパイル使用メモリ: 210,548 KB
• 最終ジャッジ日時: 2025-01-11 14:52:55
• ジャッジサーバーID （参考情報）: judge1 / judge4

ファイルパターン	結果
sample	AC * 3
other	AC * 25

ソースコード

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#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
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;
  }
}
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(long long x){
  int s=0;
  int m=0;
  char f[20];
  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');
  }
}
template<class S, class T> inline S chmin(S &a, T b){
  if(a>b){
    a=b;
  }
  return a;
}
template<class S, class T> inline S chmax(S &a, T b){
  if(a<b){
    a=b;
  }
  return a;
}
int N;
int K;
int A[100000];
int B[100000];
long long dp[100000];
int main(){
  int i;
  rd(N);
  rd(K);
  {
    int Lj4PdHRW;
    for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
      rd(A[Lj4PdHRW]);
    }
  }
  {
    int e98WHCEY;
    for(e98WHCEY=(0);e98WHCEY<(N);e98WHCEY++){
      rd(B[e98WHCEY]);
    }
  }
  for(i=(1);i<(N);i++){
    dp[i] = dp[i-1] + A[i-1] + B[i];
    if(i >= 2){
      chmin(dp[i], dp[i-2] + K + A[i-2] + B[i]);
    }
  }
  long long res = dp[N-1];
  if(N-2 >= 0){
    chmax(res, dp[N-2]);
  }
  wt_L(res);
  wt_L('\n');
  return 0;
}
// cLay varsion 20200509-1
// --- original code ---
// int N, K, A[1d5], B[1d5];
// ll dp[1d5];
// {
//   rd(N,K,A(N),B(N));
//   rep(i,1,N){
//     dp[i] = dp[i-1] + A[i-1] + B[i];
//     if(i >= 2) dp[i] <?= dp[i-2] + K + A[i-2] + B[i];
//   }
// //  wt(max(dp(N)));
//   ll res = dp[N-1];
//   if(N-2 >= 0) res >?= dp[N-2];
//   wt(res);
// }
 
 
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