Submission #260128

#	Time	Username	Problem	Language	Result	Execution time	Memory
260128		uacoder123	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	616 ms	170720 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define FOR(i,a,b) for (auto i = (a); i <= (b); ++i)
#define NFOR(i,a,b) for(auto i = (a); i >= (b); --i)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define mp(i,a) make_pair(i,a)
#define pb(a) push_back(a)
#define bit(x,b) (x&(1LL<<b))

typedef int lli;
typedef pair <lli,lli> ii;
typedef pair <lli,ii> iii;
typedef vector <lli> vi;

int t[1000000][26],par[1000000][32],co=1,lev[1000000];
vi v;
char c[1000000];
void Init()
{
  v.pb(0);
  for(int i=0;i<32;++i)
    par[0][i]=0;
  lev[0]=0;
}
void TypeLetter(char L) 
{
  if(t[v.back()][L-'a']==0)
  {
    t[v.back()][L-'a']=co;
    par[co][0]=v.back();
    c[co]=L;
    lev[co]=lev[v.back()]+1;
    for(int i=1;i<32;++i)
      par[co][i]=par[par[co][i-1]][i-1];
    v.pb(co);
    co++;

  }
  else
    v.pb(t[v.back()][L-'a']);
}
void UndoCommands(int U) 
{
  v.pb(v[v.size()-U-1]);
}
char GetLetter(int P) 
{
  P++;
  int p=lev[v.back()]-P,cur=v.back(),b=0;
  while((1LL<<b)<=p)
  {
    if(bit(p,b))
      cur=par[cur][b];
    b++;
  }
  return(c[cur]);
}

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