Submission #62515

#	Time	Username	Problem	Language	Result	Execution time	Memory
62515		zetapi	Crayfish scrivener (IOI12_scrivener)	C++14	34 / 100	1087 ms	111024 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,size[MAX],par[MAX],Parent[MAX][21];

void Init() 
{

}

int get(int u)
{
	if(par[u]==u or (X[u]>='a' and X[u]<='z'))
		return u;
	return par[u]=get(par[u]);
}

void TypeLetter(char L) 
{
	++ind;
	X[ind]=L;
	par[ind]=get(ind-1);
	size[ind]=size[par[ind]]+1;
	Parent[ind][0]=par[ind];
	for(int A=1;A<21;A++)
		Parent[ind][A]=Parent[Parent[ind][A-1]][A-1];
	return ;
}

void UndoCommands(int U) 
{
	++ind;
	par[ind]=get(ind-U-1);
	size[ind]=size[par[ind]];
	Parent[ind][0]=par[ind];
	for(int A=1;A<21;A++)
		Parent[ind][A]=Parent[Parent[ind][A-1]][A-1];
	return ;
}

char GetLetter(int P) 
{
	P++;
	int cur=ind;
	for(int A=20;A>=0;A--)
	{
		if(size[Parent[cur][A]]>=P)
			cur=Parent[cur][A];
	}
	return X[cur];
}

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

	
	TypeLetter('a');
	TypeLetter('b');
	TypeLetter('d');
	UndoCommands(2);
	UndoCommands(1);
	cout<<GetLetter(2);
	//cout<<ind<<" "<<par[ind]<<"\n";
	return 0;
}*/

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