Submission #154761

#	Time	Username	Problem	Language	Result	Execution time	Memory
154761		junodeveloper	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	628 ms	70176 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
int tcnt;
int path[1000010],top,cur;
int T[1000010][21],dep[1000010];
char ch[1000010];
void Init() {}
void TypeLetter(char L) {
	tcnt++;
	T[tcnt][0]=cur;
	dep[tcnt]=dep[cur]+1;
	int i;
	for(i=1;i<21;i++)
		T[tcnt][i]=T[T[tcnt][i-1]][i-1];
	ch[tcnt]=L;
	cur=tcnt;
	path[++top]=cur;
}
void UndoCommands(int U) {
	cur=path[top-U];
	path[++top]=cur;
}
int kth(int u,int k) {
	int i;
	for(i=0;k;i++,k>>=1)
		if(k&1)u=T[u][i];
	return u;
}
char GetLetter(int P) {
	return ch[kth(cur,dep[cur]-P-1)];
}

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