Submission #62556

#	Time	Username	Problem	Language	Result	Execution time	Memory
62556		zetapi	Crayfish scrivener (IOI12_scrivener)	C++14	60 / 100	1081 ms	81632 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

#define pb  push_back
#define mp  make_pair
#define ll  long long
#define itr ::iterator 

typedef pair<int,int>  pii;

const int MAX=3e6;

char last;

char X[MAX];

int ind,cur,tot,arr[MAX],height[MAX],Parent[MAX][21];

void Init() 
{

}

void TypeLetter(char L) 
{
	++ind;
	++tot;
	X[ind]=L;
	Parent[ind][0]=arr[tot-1];
	height[ind]=height[Parent[ind][0]]+1;
	for(int A=1;A<21;A++)
		Parent[ind][A]=Parent[Parent[ind][A-1]][A-1];
	arr[tot]=ind;
	cur=ind;
	return ;
}

void UndoCommands(int U) 
{
	++tot;
	arr[tot]=arr[tot-U-1];
	return ;
}

char GetLetter(int P) 
{
	P++;
	int res=arr[tot];
	for(int A=20;A>=0;A--)
	{
		if(height[Parent[res][A]]>=P)
			res=Parent[res][A];
	}
	//cout<<cur<<" "<<res<<" "<<height[res]<<"\n";
	return X[res];
}

/*signed main()
{
	ios_base::sync_with_stdio(false);

	
	TypeLetter('a');
	TypeLetter('b');
	TypeLetter('d');
	UndoCommands(2);
	UndoCommands(1);
	cout<<GetLetter(2);
	return 0;
}*/

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 26 / 26
• Subtask 5: 0 / 40