Submission #195699

#	Time	Username	Problem	Language	Result	Execution time	Memory
195699		FieryPhoenix	Crayfish scrivener (IOI12_scrivener)	C++11	5 / 100	707 ms	67504 KiB

scrivener

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <iomanip>
#include <deque>
#include <cassert>
#include <ctime>
#include <cstring>
#include <cstdlib>
#include <chrono>
#include <ctime>
#include <random>
#include <stack>
#include <unordered_set>
#include <unordered_map>
#include <iterator>
#include <climits>
//#include "scrivener.h"
using namespace std;
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef long long ll;
typedef long double ld;
#define INF 2001001001
#define MOD 1000000007
 
int nex;
int length[1000001];
char c[1000001];
int anc[1000001][20];
bool started=false;
int LOG[1000001];

void calcAnc(int ind){
  for (int i=1;i<=LOG[length[ind]];i++){
    if (anc[ind][i-1]==-1 || i-1>LOG[length[anc[ind][i-1]]])
      anc[ind][i]=-1;
    else
      anc[ind][i]=anc[anc[ind][i-1]][i-1];
  }
}
 
void Init(){
  anc[0][0]=-1;
  for (int i=0;i<20;i++)
    LOG[1<<i]=i;
  for (int i=1;i<=1000000;i++)
    if (LOG[i]==0)
      LOG[i]=LOG[i-1];
}
 
void TypeLetter(char ch){
  if (!started){
    c[0]=ch;
    length[0]=1;
    nex++;
    started=true;
    return;
  }
  length[nex]=length[nex-1]+1;
  c[nex]=ch;
  anc[nex][0]=nex-1;
  calcAnc(nex);
  nex++;
}
 
void UndoCommands(int x){
  length[nex]=length[nex-x-1];
  c[nex]=c[nex-x-1];
  anc[nex][0]=anc[nex-x-1][0];
  calcAnc(nex);
  nex++;
}
 
char GetLetter(int ind){
  ind=length[nex-1]-1-ind;
  int cur=nex-1;
  for (int i=LOG[length[ind]];i>=0;i--){
    if (((1<<i)&ind)!=0)
      cur=anc[cur][i];
  }
  return c[cur];
}

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