Submission #286569

#	Time	Username	Problem	Language	Result	Execution time	Memory
286569		amiratou	Crayfish scrivener (IOI12_scrivener)	C++14	12 / 100	1080 ms	120824 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int L=21,MX=(int)(1e6+7);

int up[MX][L],d[L],idx;
char car[MX];
vector<int> vec[MX];

void Init() {

}

void TypeLetter(char L) {
	vec[idx].pb(idx+1);
	d[idx+1]=d[idx]+1;
	up[idx+1][0]=idx;
	for (int i = 1; i < L; ++i)
		up[idx+1][i]=up[up[idx+1][i-1]][i-1];
	car[idx+1]=L;
	idx++;
}

void UndoCommands(int U) {
	vec[up[idx-U][0]].pb(idx+1);
	d[idx+1]=d[up[idx-U][0]]+1;
	up[idx+1][0]=up[idx-U][0];
	for (int i = 1; i < L; ++i)
		up[idx+1][i]=up[up[idx+1][i-1]][i-1];
	car[idx+1]=car[idx-U];
	idx++;
}

char GetLetter(int P) {
	assert((d[idx]-1)>=P);
	//cerr<<P<<","<<d[idx]<<"\n";
	int k=d[idx]-1-P,a=idx;
	for (int i = 0; i < L; ++i)
		if((k>>i)&1)a=up[a][i];
	return car[a];

}

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