Submission #169310

#	Time	Username	Problem	Language	Result	Execution time	Memory
169310		AlexLuchianov	Crayfish scrivener (IOI12_scrivener)	C11	34 / 100	1051 ms	79352 KiB

scrivener

//int const nmax = 1000000;

int far[20][1 + 1000000], ptr = 0;
int level[1 + 1000000];
char chr[1 + 1000000];

void Init() {}

void TypeLetter(char L) {
  ++ptr;
  far[0][ptr] = ptr - 1;
  for(int h = 1; h < 20; h++)
    far[h][ptr] = far[h - 1][far[h - 1][ptr]];
  level[ptr] = level[far[0][ptr]] + 1;
  chr[ptr] = L;
}

void UndoCommands(int U) {
  ++ptr;
  far[0][ptr] = ptr - 1 - U;
  for(int h = 1; h < 20; h++)
    far[h][ptr] = far[h - 1][far[h - 1][ptr]];
  level[ptr] = level[far[0][ptr]];
}

char GetLetter(int P) {
  int pos = ptr;
  P++;
  for(int h = 19; 0 <= h; h--)
    if(P <= level[far[h][pos]] )
      pos = far[h][pos];
  return chr[pos];
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40