Submission #88004

#	Time	Username	Problem	Language	Result	Execution time	Memory
88004		Pajaraja	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	451 ms	148556 KiB

scrivener

#include <bits/stdc++.h>
#define MAXN 1000007
#define MAXL 22
int p[MAXL][MAXN],sz,l[MAXN],brp,d[MAXN];
char t[MAXN];
void Init() {sz++;}
void TypeLetter(char L)
{
	l[++brp]=sz;
	t[sz]=L;
	d[sz]=d[l[brp-1]]+1;
	p[0][sz]=l[brp-1];
	for(int i=1;i<MAXL;i++) p[i][sz]=p[i-1][p[i-1][sz]];
	sz++;
}
void UndoCommands(int U) {l[brp+1]=l[brp-U]; brp++;}
char GetLetter(int P) 
{
	int kp=d[l[brp]]-P-1,cur=l[brp];
	while(kp!=0) {int x=(kp&-kp); cur=p[__builtin_popcount(x-1)][cur]; kp-=x;}
	return t[cur];
}

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