Submission #1214574

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214574		Malix	Crayfish scrivener (IOI12_scrivener)	C++20	100 / 100	737 ms	127628 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> ti;
typedef vector<ll> li;
typedef vector<li> lii;
 
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define LSOne(s) ((s)&(-s))

ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;

vector<char> b;
int pos=1,mx=1000010,k;
vii p;
vi arr,d;

void Init() {
  k=log2(mx)+1;
  p.resize(mx,vi(k,-1));
  b.resize(mx);d.resize(mx);
  d[0]=-1;arr.PB(0);
  REP(i,0,mx)p[i][0]=i;
}

void TypeLetter(char L) {
  int x=arr.back();
  p[pos][0]=x;
  REP(j,1,k)if(p[pos][j-1]!=-1)p[pos][j]=p[p[pos][j-1]][j-1];
  b[pos]=L;
  d[pos]=d[x]+1;
  arr.PB(pos);
  pos++;
}

void UndoCommands(int U) {
  int y=arr.size();
  arr.PB(arr[y-U-1]);
}

char GetLetter(int P) {
  int x=arr.back();
  int y=d[x];
  int z=y-P;
  while(z){
    int t=LSOne(z);
    x=p[x][log2(t)];
    z-=t;
  }
  return b[x];
}

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