Submission #911761

#	Time	Username	Problem	Language	Result	Execution time	Memory
911761		Faisal_Saqib	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	568 ms	203100 KiB

scrivener

#include <iostream>
using namespace std;
const int MAXT=3e6+1;
const int LG=50;
int tm=1;
int par[MAXT][LG];
int len[MAXT];
char cp[MAXT];
void Init()
{
}
void TypeLetter(char L)
{
	cp[tm]=L;
	len[tm]=len[tm-1]+1;
	par[tm][0]=tm-1;
	for(int j=1;j<LG;j++)
		par[tm][j]=par[par[tm][j-1]][j-1];
	tm++;
}
void UndoCommands(int U)
{
	len[tm]=len[tm-U-1];
	par[tm][0]=tm-U-1;
	for(int j=0;(j+1)<LG;j++)
		par[tm][j+1]=par[tm-U-1][j];
	tm++;
}
char GetLetter(int P)
{
	P++;
	int ct=tm-1;
	for(int j=LG-1;j>=0;j--)
		if(len[par[ct][j]]>=P)
			ct=par[ct][j];
	return cp[ct];
}

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