Submission #439276

#	Time	Username	Problem	Language	Result	Execution time	Memory
439276		prvocislo	Crayfish scrivener (IOI12_scrivener)	C++17	60 / 100	1004 ms	94012 KiB

scrivener

#include<bits/stdc++.h>
using namespace std;

const int maxn = 1e6 + 5, logn = 20;
struct cmd 
{ 
  bool undo;
  int x, sum;
  char c;
};
vector<cmd> v;
int jump[logn][maxn];
void NewCommand() // spracuj ten nakonci v ak vies ze musis ist x znakov dozadu
{
  cmd &c = v.back();
  int x = c.x + 1;
  int pv = v.size() - 1 - x;
  if (pv == -1) return;
  c.sum += v[pv].sum;
  if (v[pv].undo) pv = jump[0][pv];
  jump[0][v.size() - 1] = pv;
  for (int i = 1; i < logn; i++) jump[i][v.size() - 1] = jump[i-1][jump[i-1][v.size() - 1]];
}
void Init() {}
void TypeLetter(char L) 
{
  v.push_back({false, 0, 1, L});
  NewCommand();
}
void UndoCommands(int U) 
{
  v.push_back({true, U, 0, '.'});
  NewCommand();
}
char GetLetter(int P) 
{
  int num = v.back().sum, b = num - P;
  int id = v.size() - 1;
  if (!v[id].undo) b--;
  for (int i = 0; i < logn; i++)
    if ((1 << i) & b) id = jump[i][id];
  return v[id].c;
}

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