Submission #361498

#	Time	Username	Problem	Language	Result	Execution time	Memory
361498		NachoLibre	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	753 ms	62828 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
// #pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O3")
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("-Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
// #pragma GCC optimize("unroll-loops")
#ifndef wambule
// #include ".h"
#else
#endif

const int N = 1000006;
const int L = 20;

int dg;
int wz;
char c[N];
int dt[N];
int up[N][L];
int vs;
int v[N];

void Init() {
	vs = 0;
	wz = 1;
	dg = 0;
	dt[0] = -1;
	c[0] = ' ';
	for(int i = 0; i < L; ++i) {
		up[0][i] = -1;
	}
}

void TypeLetter(char _c) {
	c[wz] = _c;
	dt[wz] = dt[dg] + 1;
	up[wz][0] = dg;
	for(int i = 1; i < L; ++i) {
		up[wz][i] = up[wz][i - 1];
		if(up[wz][i] ^ -1) up[wz][i] = up[up[wz][i]][i - 1];
	}
	dg = wz;
	++wz;
	v[vs++] = dg;
}

void UndoCommands(int x) {
	dg = v[vs - 1 - x];
	v[vs++] = dg;
}

char GetLetter(int id) {
	int x = dg, y = 0;
	for(int i = L - 1; i >= 0; --i) {
		y = up[x][i];
		if(y != -1 && dt[y] >= id) {
			x = y;
		}
	}
	#ifdef wambule
	cout << "[:] " << c[x] << endl;
	#endif
	return c[x];
}

#ifdef wambule
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	Init();
	TypeLetter('a');
	TypeLetter('b');
	GetLetter(1);
	TypeLetter('d');
	UndoCommands(2);
	UndoCommands(1);
	GetLetter(2);
	TypeLetter('e');
	UndoCommands(1);
	UndoCommands(5);
	TypeLetter('c');
	GetLetter(2);
	UndoCommands(2);
	GetLetter(2);
	return 0;
}
#endif

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