Submission #195707

#	Time	Username	Problem	Language	Result	Execution time	Memory
195707		FieryPhoenix	Crayfish scrivener (IOI12_scrivener)	C++11	100 / 100	929 ms	90616 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 point[1000001];

void calcAnc(int ind){
  for (int i=1;i<=19;i++){
    if (anc[ind][i-1]==-1)
      anc[ind][i]=-1;
    else
      anc[ind][i]=point[anc[point[anc[ind][i-1]]][i-1]];
  }
}
 
void Init(){
  for (int i=0;i<=1000000;i++)
    point[i]=i;
  for (int i=0;i<20;i++)
    anc[0][i]=-1;
}
 
void TypeLetter(char ch){
  if (!started){
    c[0]=ch;
    length[0]=1;
    nex++;
    started=true;
    return;
  }
  length[nex]=length[point[nex-1]]+1;
  c[nex]=ch;
  anc[nex][0]=point[nex-1];
  calcAnc(nex);
  nex++;
}
 
void UndoCommands(int x){
  point[nex]=point[nex-x-1];
  nex++;
}
 
char GetLetter(int ind){
  ind=length[point[nex-1]]-1-ind;
  int cur=nex-1;
  cur=point[cur];
  for (int i=19;i>=0;i--){
    if (((1<<i)&ind)!=0)
      cur=point[anc[cur][i]];
  }
  return c[cur];
}

/*
int main(){
  Init();
  for (;;){
    char c;
    cin>>c;
    if (c=='T'){
      char d; cin>>d;
      TypeLetter(d);
    }
    else if (c=='U'){
      int x; cin>>x;
      UndoCommands(x);
    }
    else{
      int x; cin>>x;
      cout<<GetLetter(x)<<endl;
    }
  }
}
*/

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