Submission #73791

#	Time	Username	Problem	Language	Result	Execution time	Memory
73791		TuGSGeReL	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	980 ms	173996 KiB

scrivener

#include<bits/stdc++.h>
#define ll long long
#define mp make_pair
#define pub push_back
#define pob pop_back
#define ss second
#define ff first
#define ext exit(0)
using namespace std;
char s[1000001];
ll par[1000001][21],l[1000001],i=1,now=0,j;
void Init() {}
ll find(int i,int k){
	for(j=0;j<=20;j++) if((1<<j)&k) i=par[i][j];
	return i;
}
void TypeLetter(char L) {
	s[i]=L;
	par[i][0]=now;
	l[i]=l[now]+1;
	for(j=1;j<=20;j++){
		if((1<<j)>=l[i])break;
		par[i][j]=par[par[i][j-1]][j-1];
	}
	now=i;
	i++;
}
void UndoCommands(int U) {
	now=i-U-1;
	s[i]=s[now];
	for(j=0;j<=20;j++)par[i][j]=par[now][j];
	l[i]=l[now];
	i++;
}
char GetLetter(int P) {
	int x=find(i-1,l[i-1]-P-1);
	return s[x];
}

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