Submission #63035

#	Time	Username	Problem	Language	Result	Execution time	Memory
63035		Bodo171	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	942 ms	63292 KiB

scrivener

char last;
const int nmax=1000005;
int m[nmax];
void Init() { for(int i=0;i<20;i++) m[(1<<i)]=i;}
char st[nmax];
int lev[nmax],state[nmax],tt[nmax][20];
int curr,states,nr,i,b,lg=19;
void TypeLetter(char L) {

  curr=state[states];
  st[++nr]=L;state[++states]=nr;
  tt[nr][0]=curr;lev[nr]=lev[curr]+1;
  for(i=1;i<=lg;i++)
    tt[nr][i]=tt[tt[nr][i-1]][i-1];
}

void UndoCommands(int U) {
  states++;
  state[states]=state[states-U-1];
}

char GetLetter(int P) {
  curr=state[states];
  P=lev[curr]-P-1;
  while(P!=0)
  {
      b=m[((P^(P-1))&P)];
      curr=tt[curr][b];
      P&=(P-1);
  }
  return st[curr];

}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 26 / 26
• Subtask 5: 40 / 40